To see the other types of publications on this topic, follow the link: Bland- Nanocomposites.
Journal articles on the topic 'Bland- Nanocomposites'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 journal articles for your research on the topic 'Bland- Nanocomposites.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.
1
Sekulić, Zorana, Jasmina Grbović Novaković, Bojana Babić, Milica Prvulović, Igor Milanović, Nikola Novaković, Dragan Rajnović, Nenad Filipović, and Vanja Asanović. "The Catalytic Effect of Vanadium on Sorption Properties of MgH2-Based Nanocomposites Obtained Using Low Milling Time." Materials 16, no. 15 (August 5, 2023): 5480. http://dx.doi.org/10.3390/ma16155480.
Full textAbstract:
The effects of catalysis using vanadium as an additive (2 and 5 wt.%) in a high-energy ball mill on composite desorption properties were examined. The influence of microstructure on the dehydration temperature and hydrogen desorption kinetics was monitored. Morphological and microstructural studies of the synthesized sample were performed by X-ray diffraction (XRD), laser particle size distribution (PSD), and scanning electron microscopy (SEM) methods, while differential scanning calorimetry (DSC) determined thermal properties. To further access amorph species in the milling blend, the absorption spectra were obtained by FTIR-ATR analysis (Fourier transform infrared spectroscopy attenuated total reflection). The results show lower apparent activation energy (Eapp) and H2 desorption temperature are obtained for milling bland with 5 wt.% added vanadium. The best explanation of hydrogen desorption reaction shows the Avrami-Erofeev model for parameter n = 4. Since the obtained value of apparent activation energy is close to the Mg-H bond-breaking energy, one can conclude that breaking this bond would be the rate-limiting step of the process.
2
Tekay, Emre. "Preparation of tough, high modulus, and creep-resistant PS/SIS/halloysite blend nanocomposites." Journal of Thermoplastic Composite Materials 33, no. 8 (June 9, 2020): 1125–44. http://dx.doi.org/10.1177/0892705720930777.
Full textAbstract:
In this work, polystyrene (PS)/poly(styrene-b-isoprene-b-styrene) (SIS)/organophilic halloysite nanotube (Org-HNT) blend nanocomposites were produced by melt compounding technique. The significant improvements in both toughness and impact strength values were obtained in PS/SIS blends containing 20%, 30%, and 40% SIS elastomer as compared to neat PS. Among them, PS-30SIS blend with a co-continuous morphology exhibited moderate tensile and impact properties and its nanocomposites having 3, 5, 7 and 10 phr Org-HNT were prepared through the melt mixing method. All the nanocomposites exhibited continuous/fibrillar morphologies with smaller elastomer domains and higher tensile modulus and toughness as compared to PS-30SIS blend. Among them, the nanocomposite having 7 phr Org-HNT and 30% SIS phase (7H-30SIS) exhibited the highest impact strength with enhanced tensile properties. The same nanocomposite exhibited about 21% and 100% increments in the modulus and toughness in comparison to its blend, respectively. The 7H-30SIS nanocomposite increased storage moduli of PS-30SIS blend at glass transition regions of both polyisoprene and PS phases and also at room temperature. Moreover, the rubbery storage moduli of the nanocomposites were found to be about 37% and 53% higher for 7 and 10 phr Org-HNT loaded nanocomposites, respectively, in comparison with that of PS-30SIS blend. The creep deformation and permanent deformation of the blend both decreased via introduction of the nanotubes which is in agreement with aforementioned improvements in the stiffness.
3
Asgari, Alireza, Hassan Ebadi-Dehaghani, Davoud Ashouri, Saman Mousavian, and Navid Jaberzadeh Ansari. "An Investigation on Polypropylene/Nylon 66/TiO2 Blend Nanocomposites: Rheological Models." Advanced Materials Research 739 (August 2013): 111–16. http://dx.doi.org/10.4028/www.scientific.net/amr.739.111.
Full textAbstract:
Nanocomposites based on polypropylene (PP), polyamide 66 (nylon 66) and PP/nylon 66 immiscible blends containing 5wt% TiO2nanoparticles were prepared via melt compounding. The influences of TiO2on the rheology of nanocomposites and blend nanocomposites were investigated. Scanning electron microscopy results revealed the size of inclusion phase was smaller in PP/PA 66/TiO275/25/5 comparing to the PP/PA 66/TiO225/75/5. A co-continuos phase was observed at 50/50 composition. Melt dynamic rheology showed that the moduli of the PP increased with incorporation of TiO2nanoparticles at the moderate frequencies, while this effect was reverse in PA 66 nanocomposite. Several rheological and rheo-morphological models were used for prediction of rheological parameters. The well-known models for rheology of suspensions proposed by Einstein, Roscope and Eilers-van Dijck were successful for prediction of viscosity of PA nanocomposite. Palierne model was fitted to the experimental values especially for the: PP/PA 66/ TiO225/75/5 blend nanocomposite.
4
Mohammed, K. J. "Study the effect of CaCO3 nanoparticles on physical properties of biopolymer blend." Iraqi Journal of Physics (IJP) 16, no. 39 (January 5, 2019): 11–22. http://dx.doi.org/10.30723/ijp.v16i39.97.
Full textAbstract:
Chitosan (CH) / Poly (1-vinylpyrrolidone-co-vinyl acetate) (PVP-co-VAc) blend (1:1) and nanocomposites reinforced with CaCO3 nanoparticles were prepared by solution casting method. FTIR analysis, tensile strength, Elongation, Young modulus, Thermal conductivity, water absorption and Antibacterial properties were studied for blend and nanocomposites. The tensile results show that the tensile strength and Young’s modulus of the nanocomposites were enhanced compared with polymer blend [CH/(PVP-co-VAc)] film. The mechanical properties of the polymer blend were improved by the addition of CaCO3 with significant increases in Young’s modulus (from 1787 MPa to ~7238 MPa) and tensile strength (from 47.87 MPa to 79.75 MPa). Strong interfacial bonding between the CaCO3 nanoparticles and the [CH/(PVP-co-VAc)), homogenous distribution of the nanoparticles in the polymer blend, are assistance of noticeably raised mechanical durability. The thermal conductivity of the polymer blend and CaCO3 nanocomposite films show that it decreased in the adding of nanoparticle CaCO3. The solvability measurements display that the nanocomposite has promoted water resistance. The weight gain lowered with the increase of nano CaCO3. Blending chitosan CH with (PVP-co-VAc) enhanced strength and young modules of the nanocomposites and increased the absorption of water because hydrophilic of the blended polymers films. The effect of two types of positive S.aurous and negative E. coli was studied. The results showed that the nanocomposites were effective for both types, where the activity value ranged from (12 ~ 21). The best results were found for S.aurous bacteria.
5
Thomas, Saliney, Shaji Thomas, Sujit A. Kadam, Thomasukutty Jose, Jiji Abraham, Soney C. George, and Sabu Thomas. "Multiwalled carbon nanotubes reinforced flexible blend nanocomposites membranes for pervaporation separation of aromatic-aliphatic mixtures." Polymers and Polymer Composites 30 (January 2022): 096739112110690. http://dx.doi.org/10.1177/09673911211069009.
Full textAbstract:
Multiwalled carbon nanotubes (MWCNT) reinforced NR-NBR blend nanocomposite membranes were prepared and potentially employed for the pervaporation separation of aliphatic – aromatic mixtures. For a 50 wt% benzene feed, the blend nanocomposite membranes had a total flux of 1.265 kgm−2h−1 and separation factor of 1.59 at room temperature. The blend membranes exhibited aromatic selectivity for the separation of aromatic – aliphatic mixtures. 2 phr MWCNT/blend nanocomposite membranes exhibited similar trend for the separation of 10 wt% feed toluene mixture. Trasmission electron microscopy (TEM) images of the blend nanocomposites revealed the well dispersion and distribution of MWCNT in the polymer matrix. The well dispersed MWCNT/blend membranes selectively separate aromatic components from aliphatic – aromatic mixtures.
6
khanmohammadi, Sina, Ramin Karimian, Mojtaba Ghanbari Mehrabani, Bahareh Mehramuz, Khudaverdi Ganbarov, Ladan Ejlali, Asghar Tanomand, et al. "Poly (ε-Caprolactone)/Cellulose Nanofiber Blend Nanocomposites Containing ZrO2 Nanoparticles: A New Biocompatible Wound Dressing Bandage with Antimicrobial Activity." Advanced Pharmaceutical Bulletin 10, no. 4 (August 9, 2020): 577–85. http://dx.doi.org/10.34172/apb.2020.069.
Full textAbstract:
Purpose : In the present study, the poly (ε-caprolactone)/cellulose nanofiber containing ZrO2 nanoparticles (PCL/CNF/ZrO2 ) nanocomposite was synthesized for wound dressing bandage with antimicrobial activity. Methods: PCL/CNF/ZrO2 nanocomposite was synthesized in three different zirconium dioxide amount (0.5, 1, 2%). Also the prepared nanocomposites were characterized by Infrared spectroscopy (FT-IR), X-ray diffraction (XRD), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). In addition, the morphology of the samples was observed by scanning electron microscopy (SEM). Results: Analysis of the XRD spectra showed a preserved structure for PCL semi-crystalline in nanocomposites and an increase in the concentrations of ZrO2 nanoparticles, the structure of nanocomposite was amorphous as well. The results of TGA, DTA, DSC showed thermal stability and strength properties for the nanocomposites which were more thermal stable and thermal integrate compared to PCL. The contact angles of the nanocomposites narrowed as the amount of ZrO2 in the structure increased. The evaluation of biological activities showed that the PCL/CNF/ZrO2 nanocomposite with various concentrations of ZrO2 nanoparticles exhibited moderate to good antimicrobial activity against all tested bacterial and fungal strains. Furthermore, cytocompatibility of the scaffolds was assessed by MTT assay and cell viability studies proved the non-toxic nature of the nanocomposites. Conclusion: The results show that the biodegradability of nanocomposite has advantages that can be used as wound dressing.
7
Agarwal, Shalini, Y. K. Saraswat, and Vibhav K. Saraswat. "Study of Optical Constants of ZnO Dispersed PC/PMMA Blend Nanocomposites." Open Physics Journal 3, no. 1 (August 26, 2016): 63–72. http://dx.doi.org/10.2174/1874843001603010063.
Full textAbstract:
Present research work deals with the optical study of Zinc Oxide (ZnO) dispersed Polycarbonate/Polymethylmethacrylate (PC/PMMA) blend nanocomposites. ZnO nanoparticles have been prepared by simple chemical route and their average size has been confirmed by Transmission Electron Microscopy (TEM). The average particle size of the nanoparticles has been found to be ~11 nm. Formation of PC/PMMA blend nanocomposites has been confirmed by means of X-ray Diffraction (XRD). Absorption spectra, recorded using UV-Visible spectrophotometer, have been used to determine optical constants such as band gap, extinction coefficient, refractive index and real & imaginary part of dielectric constant. It has been found that band gap decreases as ZnO wt% increases in the blend nanocomposites. Lowest band gap has been found for PC25%/PMMA75% with ZnO 3 wt% blend nanocomposite. Increase in refractive index has also been found with increasing ZnO content. These types of blend nanocomposites have applications in UV-shielding and wave guide technologies.
8
AlFannakh, Huda, S. S. Arafat, and S. S. Ibrahim. "Synthesis, electrical properties, and kinetic thermal analysis of polyaniline/ polyvinyl alcohol - magnetite nanocomposites film." Science and Engineering of Composite Materials 26, no. 1 (January 28, 2019): 347–59. http://dx.doi.org/10.1515/secm-2019-0020.
Full textAbstract:
AbstractPolyaniline-poly vinyl alcohol (PANI-PVA) conducting blends containing 15 wt% aniline were synthesized by in situ polymerization of aniline. Three-phase polymer blended nanocomposites with different contents of magnetite (5, 10 and 15 wt.%) were also synthesized. We measured the current-voltage (I-V) curves for the conducting blend and its magnetite nanocomposite. We also measured their thermal stability, and performed kinetic analysis through thermogravimetric analysis. We observed that the three phase nanocomposites showed enhanced electrical conductivity compared with that of the conductive blend, and no electrical hysteresis. The PVA/PANi blend was more stable above 350∘C and the addition of Fe3O4 enhanced the thermal stability of the conductive blend. The apparent activation energy of the three phase nanocomposites was greater than those of both the pure PVA and PVA/PANi samples. These results suggest that such three phase nanocomposites could be used in a range of applications.
9
Kausar, Ayesha, Safia Haider, and Bakhtiar Muhammad. "Nanocomposite based on polystyrene/polyamide blend and bentonite." Nanomaterials and Nanotechnology 7 (January 1, 2017): 184798041770278. http://dx.doi.org/10.1177/1847980417702785.
Full textAbstract:
Novel organomodified nanoclay (bentonite) was reinforced in polystyrene, polyamide, and polystyrene/polyamide blend matrix to develop a series of nanocomposites using a solution processing technique. Modification of bentonite nanoclay was performed via an ion-exchange method with l-serine amino acid. Properties of polystyrene/modified bentonite, polyamide/modified bentonite, and polystyrene/polyamide/modified bentonite nanocomposites were studied using Fourier transform infrared spectroscopy, field emission scanning electron microscopy, thermogravimetric analysis, differential scanning calorimetry, X-ray diffraction, and cone calorimetry techniques. A unique honeycomb-like pattern was observed for polystyrene/polyamide blend with 0.5 g modified bentonite content. The morphology analysis revealed a co-continuous structure in which nanoclay particles were trapped. The polystyrene/polyamide/modified bentonite nanocomposite also showed fine improvement in thermal properties of the system, that is, initial decomposition temperature = 309–321°C and maximum weight loss temperature = 390–400°C. Glass transition temperature (351–385°C) of the series was also higher than the polystyrene/modified bentonite and polyamide/modified bentonite series. Increasing nanoclay content decreased the peak heat release rate of polystyrene/polyamide/modified bentonite 0.5 nanocomposite to 145 kW m−2, indicating improvement in nonflammability. Moreover, the blend and nanoclay series possess better flame retardancy than the blend and other nanocomposite series developed.
10
Pandey, Pratima, Rajashree Sahoo, Khusbu Singh, Sanghamitra Pati, Jose Mathew, Avinash Chandra Pandey, Rajni Kant, et al. "Drug Resistance Reversal Potential of Nanoparticles/Nanocomposites via Antibiotic’s Potentiation in Multi Drug Resistant P. aeruginosa." Nanomaterials 12, no. 1 (December 30, 2021): 117. http://dx.doi.org/10.3390/nano12010117.
Full textAbstract:
Bacteria employ numerous resistance mechanisms against structurally distinct drugs by the process of multidrug resistance. A study was planned to discover the antibacterial potential of a graphene oxide nanosheet (GO), a graphene oxide–zinc oxide nanocomposite (GO/ZnO), a graphene oxide-chitosan nanocomposite (GO–CS), a zinc oxide decorated graphene oxide–chitosan nanocomposite (GO–CS/ZnO), and zinc oxide nanoparticles (ZnO) alone and in a blend with antibiotics against a PS-2 isolate of Pseudomonas aeruginosa. These nanocomposites reduced the MIC of tetracycline (TET) from 16 folds to 64 folds against a multidrug-resistant clinical isolate. Efflux pumps were interfered, as evident by an ethidium bromide synergy study with nanocomposites, as well as inhibiting biofilm synthesis. These nanoparticles/nanocomposites also decreased the mutant prevention concentration (MPC) of TET. To the best of our knowledge, this is the first report on nanomaterials as a synergistic agent via inhibition of efflux and biofilm synthesis.
11
Abbas, K. F., and A. F. Abdulameer. "Blending Ratio Effect of ZnPc/ZnO Hybrid Nanocomposite on Surface Morphology and Structural Properties." Journal of Physics: Conference Series 2114, no. 1 (December 1, 2021): 012015. http://dx.doi.org/10.1088/1742-6596/2114/1/012015.
Full textAbstract:
Abstract Recently, organic/inorganic hybrid nanocomposites being the future in electronic applications. In this paper, we have investigated hybrid nanocomposite zinc phthalocyanine (ZnPc)/zinc oxide nanoparticles (ZnO). ZnPc/ZnO hybrid nanocomposites were prepared with different ratios (wt/wt) (1/0), (0/1), (0.75/0.25), (0.5/0.5), (0.25/0.75), and, deposited on glass substrates by spin coating technique. X-Ray diffraction investigate the structural of ZnPc/ZnO thin films and studied the morphological properties using field emission scan electron microscopy, the surface of ZnPc/ZnO hybrid nanocomposites shows the presence of nanorod-like structures represented the organic material (ZnPc) and spherical nanoparticles for (ZnO), that is depending on the ratio of the blend. In ratio (0.5/0.5) we get the preferred homogeneous surface between like-nanorod and spherical shapes were show various properties from pure compounds which used to prepare the blend. The distribution of ZnO nanoparticles on ZnPc particles nanorods led to the disappearance feature of ZnO morphological characterize and ZnPc decorated was dominated on the hybrid nanocomposite structure.
12
Patel, Vivek. "Preparation and Characterization of Biodegradable and Compatible Ethylene Vinyl Acetate (EVA)/Thermoplastic Starch (TPS) Blend Nanocomposites." Advanced Materials Research 67 (April 2009): 185–89. http://dx.doi.org/10.4028/www.scientific.net/amr.67.185.
Full textAbstract:
Ethylene vinyl acetate (EVA)/thermoplastic starch (TPS) clay nanocomposites were prepared through melt intercalation technique using Haake Rheocord 9000 batch mixer with two different organically modified clays (Cloisite 30B & Cloisite 20A) at different weight percentages (1-7 wt %).The EVA/TPS ratio of 70: 30 was taken as optimum blend ratio as evidenced from the mechanical strength and chosen for the nanocomposites preparation in the presence of MA-g-PE as a compatibilizer. The maize starch was plasticized and gelatinized by adding glycerol and water in the ratio of 70:20:10.The blend nanocomposites have been examined by various techniques for characterization. Differential scanning calorimeter (DSC) result shows that the crystallization temperature of the nanocomposite blends is significantly lower than the base blend. Addition of 30 wt % of modified starch to make EVA/TPS blend; there is deterioration of impact strength, tensile strength, tensile modulus and elongation at break which was significantly increased after incorporation of small quantity (1-7 wt %) of nanoclay. Thermo gravimetric analysis (TGA) showed that the thermal stability of blend nanocomposites were better than those of EVA/TPS blend.
13
Lim, Sang-Kyun, Eun-Hee Lee, and In-Joo Chin. "Specific interaction characteristics in organoclay nanocomposite of miscible poly(styrene-co-acrylonitrile) and poly(vinyl chloride) blend." Journal of Materials Research 23, no. 4 (April 2008): 1168–74. http://dx.doi.org/10.1557/jmr.2008.0148.
Full textAbstract:
We propose a new method for the preparation of the polymer/organoclay nanocomposite, termed the solution and melt mixing (SOAM) method, where the polymer and clays are first blended in solution, and subsequently the mixture is further blended in the melt. We prepared the ternary nanocomposite systems of poly(styrene-co-acrylonitrile) (SAN), poly(vinyl chloride) (PVC) and Cloisite25A clays (C25A) by solution blending as well as by the SOAM method. The C25A content in the nanocomposite was optimized by analyzing the x-ray diffraction (XRD) data of binary mixtures (SAN/C25A and PVC/C25A nanocomposites). The values of the interaction parameter (χab) were calculated by using the molar attraction constants of the specific functional groups derived from Hoy’s table. While PVC and C25A were shown to be highly compatible, SAN and C25A were less compatible. XRD data and transmission electron microscopy observations indicated that the SAN/PVC/C25A nanocomposites had at least partially exfoliated structures. The tensile modulus and the elongation at break of the nanocomposites prepared by the SOAM method were higher than those prepared by simple solution blending.
14
AHMED, S. M., A. A. A. DARWISH, E. A. EL-SABAGH, N. A. MANSOUR, D. E. ABULYAZIED, and E. S. ALI. "PHYSICOCHEMICAL PROPERTIES OF PREPARED ZnO/ POLYSTYRENE NANOCOMPOSITES: STRUCTURE, MECHANICAL AND OPTICAL." Journal of Ovonic Research 16, no. 1 (January 2020): 71–81. http://dx.doi.org/10.15251/jor.2020.161.71.
Full textAbstract:
Nanocomposites of polystyrene nano sphere (PS) with different loading of nano zinc oxide (ZnO) were prepared by two different methods, blend and in situ method. The prepared films of the synthesized nanocomposites materials were characterized by energy dispersive investigation (EDX), X-ray diffraction (XRD) and the morphology of ZnO/PS nanocomposite were investigated by transmission electron microscope (TEM). Phase composition and microstructure analysis shows that ZnO nanoparticles content has an influence on the crystal structure and morphology of ZnO/PS nanocomposite. The effect of ZnO nanoparticles on linear optical properties was studied in the PS lattice. The obtained results indicate that, the refractive index has been increased while the energy gap decreased with increasing ZnO nanoparticles contents. The improving of mechanical properties of ZnO/PS nanocomposite is verified due to the addition of ZnO nanoparticles.
15
Fauzi, N. M., and Zurina Mohamad. "Tensile Properties and Morphology of Polyamide 6 (PA6)/Ethylene Vinyl Acetate (EVA)/Sepiolite Nanocomposite." Applied Mechanics and Materials 735 (February 2015): 61–64. http://dx.doi.org/10.4028/www.scientific.net/amm.735.61.
Full textAbstract:
This study was conducted in order to develop the new polymer nanocomposites. In this case, sepiolite was incorporated into Polyamide 6 (PA6) / Ethylene vinyl acetate (EVA) blend. The main aim of this research is to examine the effect of sepiolite concentration on the properties of PA6/EVA/sepiolite nanocomposite. The variations of sepiolite (2 – 10 phr) were added into PA6/EVA blend at the ratio of 80/20 wt%. The nanocomposites were prepared using twin screw extruder and injection moulding. Mechanical properties of PA6/EVA/sepiolite nanocomposite were analyzed by tensile testing and it was revealed that there is no change in stiffness and decrease in strength with more sepiolite content. Meanwhile, the morphology of materials was characterized by field emission scanning electron microscopy (FESEM). The morphology revealed that, the dispersion of sepiolite nanofiller seems to be good and the EVA domain size and distribution was effected by sepiolite content.
16
Raiati, Maryam, Mohammadreza Kalaee, and Saeedeh Mazinani. "EFFECT OF FILLER TYPE AND CONTENT ON PHYSICAL AND MECHANICAL PROPERTIES OF NR/SBR NANOCOMPOSITE BLEND." Rubber Chemistry and Technology 90, no. 4 (October 1, 2017): 751–64. http://dx.doi.org/10.5254/rct.18.82695.
Full textAbstract:
ABSTRACT The effect of type and content of nanofiller on the cure behavior, cure characteristics, and mechanical and dynamic mechanical thermal properties of the vulcanized SBR/NR (30/70) blend nanocomposites containing carbon black were investigated. Halloysite nanotube (HNT) and calcium carbonate (CaCO3) nanoparticles were used as reinforcing agents at different levels ranging from 0 to 5 phr. Two nanofillers affected the cure characteristics of the blended vulcanizates in opposite ways. While the gradual incorporation of HNT into the elastomer blend shortened the scorch time along with an increase in the effective torque of resulting nanocomposite compared to the unfilled blend, the progressive addition of CaCO3 into the blend monotonically prolonged the scorch time in conjunction with a decrease in the effective torque of vulcanizate sample. Mechanical tests showed enhanced elastic modulus and tensile strength of HNT-filled nanocomposites as the HNT content was increased. Nanocomposites reinforced with HNT exhibited significantly higher extensibility than the unfilled blend. In the case of CaCO3-filled nanocomposites, the elastic modulus and ultimate strength decreased upon the addition of CaCO3 nanoparticles, whereas the strain at break showed a substantial increase compared to unfilled compound. Dynamic mechanical thermal analysis results revealed a monotonic shift of damping peak's temperature toward higher temperatures with HNT loading in HNT-filled vulcanizate nanocomposites. For CaCO3-filled nanocomposites, the damping peak's temperature shifted to higher temperatures at first and then shifted back to lower temperatures at higher loadings of CaCO3. The damping peak's intensity of the CaCO3-filled nanocomposites was considerably higher than the unfilled blend, indicating higher damping capability in these systems.
17
Shrivastava, Nilesh Kumar, Ooi Shu Wooi, Azman Hassan, and Ibrahim Mohammed Inuwa. "Mechanical and flammability properties of poly(lactic acid)/poly(butylene adipate-co-terephthalate) blends and nanocomposites: Effects of compatibilizer and graphene." Malaysian Journal of Fundamental and Applied Sciences 14, no. 4 (December 16, 2018): 425–31. http://dx.doi.org/10.11113/mjfas.v14n4.1233.
Full textAbstract:
Poly(lactic acid) (PLA)/polybutylene adipate co-terephthalate (PBAT) blends were prepared by melt blending and compatibilized by glycidyl methacrylate (GMA). The effect of graphene nanoplatelets (GNP) on these compatibilized blends were investigated by incorporating GNP at different content. The formulated blend and nanocomposites were characterized for mechanical, morphological, thermal and flammability properties by using universal testing machine, impact tester, field emission scanning electron microscope (FESEM), x-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), limiting oxygen index (LOI) and UL-94 respectively. The incorporation of 8 phr GMA into PLA/PBAT (75:25) blend as a compatibilizer results in a significant increase in impact strength (more than 14 times higher) compared to the uncompatibilized blend. Young's modulus and tensile strength of compatibilized PLA/PBAT nanocomposites increased upon addition of GNP and reached maximum values at 4 phr before decreasing slightly. However, impact strength decreased with increasing GNP contents. The thermal stability and the flame retardancy of the GNP reinforced blend nanocomposites were also improved with an increase in nanofiller content and the maximum values for the nanocomposites were achieved at 6 phr. Interestingly, the nanocomposites samples showed a UL-94 rating of V0 at 4 and 6 phr of GNP. Morphological studies using FESEM showed the GNP were evenly distributed and dispersed in the PLA/PBAT nanocomposites. The current methodology to prepare PLA/PBAT blend nanocomposite is an economical way to produce high strength biodegradable polymer which also has good flame retardancy.
18
Azman, Hassan, Muhammad Imran, Mat Uzir Wahit, and Harintharavimal Balakrishnan. "Recent Developments in PA6/PP Nanocomposites." Key Engineering Materials 471-472 (February 2011): 7–19. http://dx.doi.org/10.4028/www.scientific.net/kem.471-472.7.
Full textAbstract:
An overview of the recent developments in PA6/PP blend nanocomposites is presented in this paper with an emphasis on their mechanical, thermal and morphological properties. The role of organoclay as a reinforcing agent and polyethylene octene (POE) as an elastomer are discussed in detail. The organoclay increases the strength and stiffness while the POE elastomer increases the impact toughness of the nanocomposites. The effects of various parameters such as PA6/PP blend ratio, organoclay loading and the concentration of elastomer on the nanocomposites properties are also examined. The exfoliated state of organoclay platelets along with the fine particle size and uniform dispersion of POE demonstrate the nanocomposite with improved properties. These materials are attracting considerable interest in polymer research community because they exhibit substantial improvement in properties at low filler contents.
19
Yin, Biao, Yanwei Wen, Hongbing Jia, Jingyi Wang, Zhaodong Xu, and Lifeng Ding. "Synergistic effects of hybridization of carbon black and carbon nanotubes on the mechanical properties and thermal conductivity of a rubber blend system." Journal of Polymer Engineering 37, no. 8 (October 26, 2017): 785–94. http://dx.doi.org/10.1515/polyeng-2016-0375.
Full textAbstract:
Abstract The effects of hybridization of multi-walled carbon nanotubes (MWCNTs) with carbon black (CB) and the structure-property relationships of nanocomposites based on hydrogenated nitrile-butadiene rubber/hydrogenated carboxylated nitrile-butadiene rubber blends were extensively studied. MWCNTs used in this work were modified through acid treatment to improve the dispersion of MWCNTs in the rubber matrix and the surface interaction between MWCNTs and matrix. Synergistic interaction between CB and MWCNTs increased the tensile modulus and tear strength of nanocomposites. The effect of MWCNTs on the transport properties invoked an increment in the thermal conductivity of the nanocomposites. A combination of 10 phr (parts per hundred rubber) MWCNTs with 40 phr CB dramatically increased the modulus at 100% elongation, tear strength, and thermal conductivity of the nanocomposite by 66%, 28%, and 36%, respectively, compared with those of nanocomposite filled with 40 phr CB.
20
Zazoum, B., E. David, and A. D. Ngô. "LDPE/HDPE/Clay Nanocomposites: Effects of Compatibilizer on the Structure and Dielectric Response." Journal of Nanotechnology 2013 (2013): 1–10. http://dx.doi.org/10.1155/2013/138457.
Full textAbstract:
PE/clay nanocomposites were prepared by mixing a commercially available premixed polyethylene/O-MMT masterbatch into a polyethylene blend matrix containing 80 wt% low-density polyethylene and 20 wt% high-density polyethylene with and without anhydride modified polyethylene (PE-MA) as the compatibilizer using a corotating twin-screw extruder. In this study, the effect of nanoclay and compatibilizer on the structure and dielectric response of PE/clay nanocomposites has been investigated. The microstructure of PE/clay nanocomposites was characterized using wide-angle X-ray diffraction (WAXD) and a scanning electron microscope (SEM). Thermal properties were examined using differential scanning calorimetry (DSC). The dielectric response of neat PE was compared with that of PE/clay nanocomposite with and without the compatibilizer. The XRD and SEM results showed that the PE/O-MMT nanocomposite with the PE-MA compatibilizer was better dispersed. In the nanocomposite materials, two relaxation modes are detected in the dielectric losses. The first relaxation is due to a Maxwell-Wagner-Sillars interfacial polarization, and the second relaxation can be related to dipolar polarization. A relationship between the degree of dispersion and the relaxation ratefmaxof Maxwell-Wagner-Sillars was found and discussed.
21
Do Quang, Khang, Quang Tran Huu, Do Trung Sy, Nguyen Tien Dung, Tran Huu Huy, Nguyen Thi Diep, Pham Quynh Trang, and Pham Cong Nguyen. "Preparation and properties of rubber nanocomposites based on natural rubber/ ethylene propylene diene monomer reinforced with nanosilica, carbon black and barium sulfate." Vietnam Journal of Science and Technology 60, no. 4 (August 31, 2022): 652–63. http://dx.doi.org/10.15625/2525-2518/16751.
Full textAbstract:
In this work, rubber nanocomposites based on natural rubber/ethylene propylene diene monomer (NR/EPDM) blends and reinforced with nanosilica (NS) in combination with carbon black (CB) and barium sulfate (BS) were prepared by melt blending method in a Brabender internal mixer. The appropriate contents of NS and CB for reinforcing the rubber nanocomposites based on NR/EPDM are 10 and 30 phr (parts per hundred rubber), respectively. The NR/EPDM nanocomposites material reinforced with 10 phr NS and 30 phr CB has the best mechanical properties that with the enhancement of tensile strength over 117% and 40 % compared to that of the NR/EPDM nanocomposite material unreinforced and reinforced with only 10 phr NS, respectively. The appropriate content of BS for replacement of CB in the NR/EPDM blend is 6 phr. The rubber nanocomposite based on NR/EPDM (60/40) blend reinforced with 10 phr NS, 24 phr CB and 6 phr BS has a tight structure, high mechanical properties, and especially, high alkali resistance and heat resistance, abrasion resistance and low endogenous heat due to rotation and friction. This material may be used to manufacture technical rubber products that require heat resistance and stability in alkaline environments, such as conveyor belts used in the cement industry.
22
Chow, Wen Shyang, and Yuan Ting Lim. "Antistatic and Thermal Properties of Poly(Lactic Acid)/Polypropylene/Carbon Nanotube Nanocomposites." Journal of Engineering Science 16, no. 2 (December 10, 2020): 57–69. http://dx.doi.org/10.21315/jes2020.16.2.3.
Full textAbstract:
The aim of this study is to investigate the influence of carbon nanotubes (CNT) on the antistatic and thermal properties of poly(lactic acid)/polypropylene/carbon nanotubes (PLA/PP/CNT) nanocomposites. PLA/PP (blend ratio = 60:40) containing CNT (loading 1.0 to 2.5 phr) was melt-compounded followed by compression moulding. The antistatic properties of PLA/PP/CNT nanocomposites achieved at 2.5 phr CNT loading. Thermogravimetric analysis (TGA) results indicated that the thermal stability of PLA/PP/ CNT nanocomposite was higher than PLA/PP blend. Differential Scanning Calorimetry (DSC) results demonstrated that CNT reduced the cold crystallisation temperature of PLA, while increased the crystallisation temperature of PP, which evidenced the nucleatingability of CNT in the PLA/PP blends.
23
Palawat, Natsuda, Phasawat Chaiwutthinan, Sarintorn Limpanart, Amnouy Larpkasemsuk, and Anyaporn Boonmahitthisud. "Hybrid Nanocomposites of Poly(Lactic Acid)/Thermoplastic Polyurethane with Nanosilica/Montmorillonite." Materials Science Forum 947 (March 2019): 77–81. http://dx.doi.org/10.4028/www.scientific.net/msf.947.77.
Full textAbstract:
The aim of this study is to improve the physical properties of poly(lactic acid) (PLA) by incorporating thermoplastic polyurethane (TPU), organo-montmorillonite (OMMT) and/or nanosilica (nSiO2). PLA was first melt mixed with five loadings of TPU (10–50 wt%) on a twin-screw extruder, followed by injection molding. The addition of TPU was found to increase the impact strength, elongation at break and thermal stability of the blends, but decrease the tensile strength and Young’s modulus. Based on a better combination of the mechanical properties, the 70/30 (w/w) PLA/TPU blend was selected for preparing both single and hybrid nanocomposites with a fix total nanofiller content of 5 parts per hundred of resin (phr), and the OMMT/nSiO2 weight ratios were 5/0, 2/3, 3/2 and 0/5 (phr/phr). The Young’s modulus and thermal stability of the nanocomposites were all higher than those of the neat 70/30 PLA/TPU blend, but at the expense of reducing the tensile strength, elongation at break and impact strength. However, all the nanocomposites exhibited higher impact strength and Young’s modulus than the neat PLA. Among the four nanocomposites, a single-filler nanocomposite containing 5 phr nSiO2 exhibited the highest impact strength and thermal stability, indicating that there was no synergistic effect of the two nanofillers on the investigated physical properties. However, the hybrid nanocomposite containing 2/3 (phr/phr) OMMT/nSiO2 possessed a compromise in the tensile properties.
24
Arat, Abdulameer Khalaf. "Preparation and Characterization of (Biopolymer blend-PbO2) Nanocomposites For Gamma Ray Shielding Applications." JOURNAL OF UNIVERSITY OF BABYLON for Pure and Applied Sciences 26, no. 6 (May 8, 2018): 31–44. http://dx.doi.org/10.29196/jubpas.v26i6.1365.
Full textAbstract:
In the present work, nanocomposites of polyvinyl pyrrolidone (PVP), carboxymethyl cellu- lose (CMC) and lead oxide nanoparticles (PbO2) have been prepared to use for gamma ray shielding applications. The nanocomposites have been prepared by casting technique. The lead oxide nanoparticles were added to the mixture of (PVP 55 wt.% and CMC 45 wt.%) with different concentrations are (0,1.5,3 and 4.5) wt.%. The D.C electrical conductivity and optical properties of nanocomposites were studied. The experimental results showed that the D.C electrical conductivity increases with increase the lead oxide nanoparticles concentrations. The absorbance and optical constants increase with the increase of PbO2 concentrations but the energy band gap decreases with the increase of PbO2 concentrations. The results of (polyvinyl pyrrolidone, carboxymethyl cellulose and lead oxide nanoparticles) nanocomposites application for gamma ray shielding showed that the (PVP-CMC-PbO2) nanocomposite have high linear attenuation coefficients for Cs-137 gamma ray sources.
25
Yussuf, A. A., M. A. Al-Saleh, and S. T. Al-Enezi. "Investigation of Thermal and Rheological Properties of Polypropylene and Montmorillonite (MMT) Nanocomposites." Advanced Materials Research 1105 (May 2015): 3–6. http://dx.doi.org/10.4028/www.scientific.net/amr.1105.3.
Full textAbstract:
The performances of PP/MMT nanocomposite (70μm thick films), in terms of thermal and rheological properties were investigated. A twin-screw extruder was used to compound PP, MMT, compatibilizer, and extruded nanocomposite films were collected for test. All results were compared and the influence of MMT contents on the final properties were observed and reported. The thermal properties of PP had improved by increasing MMT content from 0-3 phr. However at 4 phr thermal stability of the nanocomposite had slightly dropped. In terms of rhelogical properties, the addition of MMT to the PP blend increased the complex viscosity of the nanocomposites, particularly at low frequency regions.
26
Praharaj, Ankita Pritam, Dibakar Behera, Tapan Kumar Bastia, and Arun Kumar Rout. "BisGMA/EPDM/amine functionalised MWCNTs based nanocomposites." Pigment & Resin Technology 44, no. 5 (September 7, 2015): 266–75. http://dx.doi.org/10.1108/prt-10-2014-0094.
Full textAbstract:
Purpose – This paper aims to focus on the development and study properties of bisphenol-A glycidyldimethacrylate (BisGMA) and ethylene–propylene–diene monomer (EPDM) blend-based nanocomposites containing amine-functionalised multi-walled carbon nanotubes (MWCNT-NH2) as a compatibiliser. Design/methodology/approach – First, BisGMA was synthesised from epoxy and methacrylic acid followed by the amine functionalisation of MWCNTs. A novel two-roll milling technique was then conducted to prepare nanocomposite specimens with MWCNT-NH2 as compatibiliser. Effect of MWCNT-NH2 content on the mechanical, thermal, electrical, corrosive and water absorption properties of the nanocomposites was investigated and results have been reported. Findings – The results of the present work reveal that MWCNT-NH2 acts as a potential compatibiliser and nanofiller in BisGMA/EPDM blend-based nanocomposites. The authors report here that the nanocomposites exhibit improved mechanical, thermal and electrical properties with increased addition of MWCNT-NH2. Moreover, desirable results are obtained at 5 phr of nanofiller loading beyond which the properties deteriorate due to particle agglomeration. The nanocomposites display negligible corrosion and water absorption characteristics. Thus, the above fabricated nanocomposites with optimum compatibiliser content can serve as low-cost structural, thermal and electrical materials which can also be utilised in corrosive and moist environments. Research limitations/implications – The present investigation has come up with the successful and cost-effective fabrication of BisGMA/EPDM blend-based nanocomposites with optimum nanofiller/compatibiliser (MWCNT-NH2) content that can be used for a wide range of structural, thermal and electrical projects, as it is corrosion and moisture resistant. It is also the most durable from the mechanical point of view. Originality/value – The above nanocomposites have never been designed before.
27
Keloth Paduvilan, Jibin, Prajitha Velayudhan, Ashin Amanulla, Hanna Joseph Maria, Allisson Saiter-Fourcin, and Sabu Thomas. "Assessment of Graphene Oxide and Nanoclay Based Hybrid Filler in Chlorobutyl-Natural Rubber Blend for Advanced Gas Barrier Applications." Nanomaterials 11, no. 5 (April 23, 2021): 1098. http://dx.doi.org/10.3390/nano11051098.
Full textAbstract:
Nanomaterials have engaged response from the scientific world in recent decades due to their exceptional physical and chemical properties counter to their bulk. They have been widely used in a polymer matrix to improve mechanical, thermal, barrier, electronic and chemical properties. In rubber nanocomposites, nanofillers dispersion and the interfacial adhesion between polymer and fillers influences the composites factual properties. In the present work, a comparison of the hybrid effects of carbon black with two different nanofillers (graphene oxide and nanoclay) was studied. The 70/30 composition of chlorobutyl rubber/natural rubber elastomer blend was taken as per the blend composition optimized from our previous studies. The hybrid effects of graphene oxide and nanoclay in dispersing the nanofillers were studied mainly by analyzing nanocomposite barrier properties. The results confirm that the combined effect of carbon black with graphene oxide and nanoclay could create hybrid effects in decreasing the gas permeability. The prepared nanocomposites which partially replace the expensive chlorobutyl rubber can be used for tyre inner liner application. Additionally, the reduction in the amount of carbon black in the nanocomposite can be an added advantage of considering the environmental and economic factors.
28
Chen, Cheng-Ho, Ying-Chen Lin, and Fu-Su Yen. "Synthesis and Characterization of Conducting PANDB/χ-Al2O3 Core-Shell Nanocomposites by In Situ Polymerization." Polymers 13, no. 16 (August 19, 2021): 2787. http://dx.doi.org/10.3390/polym13162787.
Full textAbstract:
Polyaniline doped with dodecylbenzenesulfonic acid/χ-aluminum oxide (PANDB/χ-Al2O3) conducting core-shell nanocomposites was synthesized via an in situ polymerization method in this study. PANDB was synthesized in the presence of dodecylbenzenesulfonic acid (DBSA), which functioned as a dopant and surfactant. The electrical conductivity of the conducting PANDB/χ-Al2O3 core-shell nanocomposite was approximately 1.7 × 10−1 S/cm when the aniline/χ-Al2O3 (AN/χ-Al2O3) weight ratio was 1.5. The transmission electron microscopy (TEM) results indicated that the χ-Al2O3 nanoflakes were thoroughly coated by PANDB to form the core-shell (χ-Al2O3-PANDB) structure. The TEM and field-emission scanning electron microscopy (FE-SEM) images of the conducting PANDB/χ-Al2O3 core-shell nanocomposites also indicated that the thickness of the PANDB layer (shell) could be increased as the weight ratio of AN/χ-Al2O3 was increased. In this study, the optimum weight ratio of AN/χ-Al2O3 was identified as 1.5. The conducting PANDB/χ-Al2O3 core-shell nanocomposite was then blended with water-based polyurethane (WPU) to form a conducting WPU/PANDB/χ-Al2O3 blend film. The resulting blend film has promising antistatic and electrostatic discharge (ESD) properties.
29
Tekay, Emre, Nihan Nugay, Turgut Nugay, and Sinan Şen. "Tuning of nanotube/elastomer ratio for high damping/tough and creep resistant polypropylene/SEBS-g-MA/HNT blend nanocomposites." Journal of Composite Materials 53, no. 8 (August 16, 2018): 1005–22. http://dx.doi.org/10.1177/0021998318794267.
Full textAbstract:
Polypropylene (PP)/maleic anhydride grafted polystyrene-b-poly (ethylene/butylene)-b-polystyrene (SEBS-g-MA)/organophilic halloysite nanotube clay ternary nanocomposites were produced by using HNT/SEBS-g-MA masterbatches at different nanotube loadings (1 wt%, 3 wt%, and 5 wt%). The masterbatches with different ratios of HNT/SEBS-g-MA (1/1, 1/2, and 1/3) were prepared via a revolution/rotation type mixing-assisted masterbatch process. All nanocomposites showed higher storage moduli and damping at low temperatures as compared to neat polypropylene. The nanocomposites having HNT/SEBS-g-MA ratio of 1/3 were found to act as effective dampers with their relatively higher damping values. In terms of short-term creep performance, 1 wt% and 3 wt% organophilic halloysite nanotube loaded systems with low amount of SEBS-g-MA (<9 wt%) enhanced dimensional stability of polypropylene with their lower creep strain and permanent deformation values. More specifically, among the nanocomposites, 3 wt% organophilic halloysite nanotube loaded nanocomposite with HNT/SEBS-g-MA ratio of 1/3 and co-continuous like morphology not only exhibited an effective damping over a wide range of temperature (from −70℃ to 50℃) but also showed relatively higher storage moduli at low temperature region together with lower permanent creep deformation as compared to neat polypropylene. As a result, the HNT/SEBS-g-MA masterbatch in 1/3 ratio was found to be the most suitable in polypropylene blend nanocomposites. It may be advantageous for polypropylene nanocomposite based applications where high damping/toughness at low temperature conditions and high dimensional stability under load are desired.
30
Nayef, F. M., and B. H. Rabee. "Effect of plasma irradiation on the electrical characteristics of the PMMA-PS/Al2O3 nanocomposites." Digest Journal of Nanomaterials and Biostructures 18, no. 2 (2023): 669–80. http://dx.doi.org/10.15251/djnb.2023.182.669.
Full textAbstract:
A nanocomposite consisting of (PMMA/PS) polymeric blend was prepared with the nanomaterials (Al2O3) by the casting method. The structural and dielectric characteristic were studied. The optical microscope photos demonstrated high homogeneousness and fine dispersal of Al2O3 NPs inside the blend polymer films, as well as the formation of charge transfer complex. The FTIR indicate to a physical interference between the polymer matrix and nanoparticles. SEM images showed agglomeration of small and close packed group of elliptical particles on the surface of the polymeric matrix as a result of adding different number of Al2O3 NPs. The insulator constant and the insulator loss of the (PMMA-PS/Al2O3) nanocomposites reduce with the rise in frequency, while the A.C electrical conductivity increases with increase of the frequency. The insulator constant, insulator loss and A.C electrical conductivity of (PMMA-PS/Al2O3) nanocomposites rises with raising of Al2O3 nanoparticles concentrations. The dielectric constant, dielectric loss and A.C electrical conductivity after irradiation have high values compared before irradiation which attributed to the plasma interact with the molecular of these nanocomposites. As a results of their improved electrical conductivity after irradiation, polymeric nanocomposites have been proposed for use in electronic devices, sensors, and batteries.
31
Fermas, Walid, Mustapha Kaci, Remo Merijs Meri, and Janis Zicans. "Mechanical and Thermal Properties of Ternary System Based on Starch-Grafted-Polyethylene/High Density Polyethylene/Halloysite Nanocomposites." Key Engineering Materials 800 (April 2019): 210–15. http://dx.doi.org/10.4028/www.scientific.net/kem.800.210.
Full textAbstract:
In this paper, the effect of unmodified halloysite nanotubes (HNTs) content on the chemical structure and the thermal and mechanical properties of blends based on starch-grafted-polyethylene (SgP) and high density polyethylene (HDPE) (70/30 w/w) nanocomposites was investigated at various filler content ratios, i.e. 1.5, 3 and 5 wt.%. The study showed the occurrence of chemical interactions between the polymer matrix and HNTs through OH bonding. Further, the addition of HNTs to the polymer blend led to an increase in the crystallization temperature of the nanocomposite samples, in particular at higher filler contents i.e. 3 and 5 wt.%, while the melting temperature remained almost unchanged. Tensile and flexural properties of the nanocomposite samples were however improved compared to the virgin blend with respect to the HNTs content ratio.
32
Ahmad, Ahmad Fahad, Sidek Ab Aziz, Zulkifly Abbas, Suzan Jabbar Obaiys, Khamirul Amin Matori, Mohd Hafiz Mohd Zaid, Haider K. Raad, and Umar Sa’ad Aliyu. "Chemically Reduced Graphene Oxide-Reinforced Poly(Lactic Acid)/Poly(Ethylene Glycol) Nanocomposites: Preparation, Characterization, and Applications in Electromagnetic Interference Shielding." Polymers 11, no. 4 (April 11, 2019): 661. http://dx.doi.org/10.3390/polym11040661.
Full textAbstract:
In this study, a nanocomposite of reduced graphene oxide (RGO) nanofiller-reinforcement poly(lactic acid) (PLA)/poly(ethylene glycol) (PEG) matrix was prepared via the melt blending method. The flexibility of PLA was improved by blending the polymer with a PEG plasticizer as a second polymer. To enhance the electromagnetic interference shielding properties of the nanocomposite, different RGO wt % were combined with the PLA/PEG blend. Using Fourier-transform infrared (FT-IR) spectroscopy, field emission scanning electron microscopy (FE-SEM) and X-ray diffraction, the structural, microstructure, and morphological properties of the polymer and the RGO/PLA/PEG nanocomposites were examined. These studies showed that the RGO addition did not considerably affect the crystallinity of the resulting nanomaterials. Thermal analysis (TGA) reveals that the addition of RGO highly improved the thermal stability of PLA/PEG nanocomposites. The dielectric properties and electromagnetic interference shielding effectiveness of the synthesized nanocomposites were calculated and showed a higher SE total value than the target value (20 dB). On the other hand, the results showed an increased power loss by increasing the frequency and conversely decreased with an increased percentage of filler.
33
Hernandez-Guerrero, Oscar, Rubén Castillo-Pérez, Mireya Lizbeth Hernández-Vargas, and Bernardo Fabián Campillo-Illanes. "Study Of Thermal And Mechanical Properties Of Clay/Polymer Nanocomposite Synthesized Via Modified Solution Blending." MRS Advances 2, no. 49 (2017): 2757–62. http://dx.doi.org/10.1557/adv.2017.560.
Full textAbstract:
ABSTRACTThe incorporation of layered nano-silicates in polymer matrix greatly enhances the properties of the polymer. At present, there are many applications of polymer nanocomposites including coatings and architectural, they are also parts of automotive and construction industry among others. The acrylics employed at the present study were based on butyl acrylate (BA), styrene (STY), and methacrylic acid (MAA), and the nano-clay was Na-montomorillonite (MMT). The MMT clay was added to the polymer, which is the mixing matrix in a physical state solution called blend. Furthermore, their mechanical, thermal and wettability of especially prepared acrylic montmorillonite (MMT) nanocomposites were performed. By increasing the MMT in the polymer matrix concentration the Young’s modulus tends to increase it by an order of magnitude. However, by Differential Scanning Calorimetry (DSC), the thermograms show an increase in the glass transition temperature of nanocomposites for all weight percentages of MMT. Also, the wetting angle was determined, in order to know how much water is retained on the surface of the nanocomposite; the results showed that by increasing the particle of nano clay in the polymer matrix will induce a hydrophobic property to the nanocomposite.
34
Chen, Xin, Qiyan Zhang, Ziyu Liu, Yifei Sun, and Q. M. Zhang. "High dielectric response in dilute nanocomposites via hierarchical tailored polymer nanostructures." Applied Physics Letters 120, no. 16 (April 18, 2022): 162902. http://dx.doi.org/10.1063/5.0087495.
Full textAbstract:
This paper presents a hierarchically designed polymer nanocomposite approach in which nanofillers at ultralow volume loading generate large dielectric enhancement in blends of high temperature dielectric polymers with tailored nanostructures. We blend poly(1,4-phenylenen ether sulfone) (PES) with polymers, such as polyetherimide (PEI), that possess more coiled chain conformations to tailor polymer nano-morphologies. Making use of such blends as the matrix, dilute nanocomposites with 0.65 vol. % loading of alumina nanoparticles (20 nm size) generate a marked enhancement in dielectric performance, i.e., raising the dielectric constant K from PES K = 3.9 (and PEI K = 3.2) to the dilute nanocomposites K = 7.6, a much higher enhancement compared with the dilute nanocomposites employing neat polymers as the matrix. The results show that polymer blends with tailored nano-morphologies as the matrix can lead to higher dielectric enhancement in dilute nanocomposites compared with neat polymers as the matrix.
35
Hassan, S. F., and M. Gupta. "Development and Characterization of Ductile Mg∕Y2O3 Nanocomposites." Journal of Engineering Materials and Technology 129, no. 3 (January 11, 2007): 462–67. http://dx.doi.org/10.1115/1.2744418.
Full textAbstract:
Nano-Y2O3 particulates containing ductile magnesium nanocomposites were synthesized using blend-press-sinter powder metallurgy technique followed by hot extrusion. Microstructural characterization of the nanocomposite samples showed fairly uniform reinforcement distribution, good reinforcement-matrix interfacial integrity, significant grain refinement of magnesium matrix with increasing presence of reinforcement, and the presence of minimal porosity. Mechanical properties characterization revealed that the presence of nano-Y2O3 reinforcement leads to marginal increases in hardness, 0.2% yield strength and ultimate tensile strength, but a significant increase in ductility and work of fracture of magnesium. The fracture mode was changed from brittle for pure Mg to mix ductile and intergranular in the case of nanocomposites.
36
Mu, Liwen, Jiahua Zhu, Jingdeng Fan, Zhongxin Zhou, Yijun Shi, Xin Feng, Huaiyuan Wang, and Xiaohua Lu. "Self-Lubricating Polytetrafluoroethylene/Polyimide Blends Reinforced with Zinc Oxide Nanoparticles." Journal of Nanomaterials 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/545307.
Full textAbstract:
ZnO nanoparticle reinforced polytetrafluoroethylene/polyimide (PTFE/PI) nanocomposites were prepared and their corresponding tribological and mechanical properties were studied in this work. The influences of ZnO loading, sliding load, and velocity on the tribological properties of ZnO/PTFE/PI nanocomposites were systematically investigated. Results reveal that nanocomposites reinforced with 3 wt% ZnO exhibit the optimal tribological and mechanical properties. Specifically, the wear loss decreased by 20% after incorporating 3 wt% ZnO compared to unfilled PTFE/PI. Meanwhile, the impact strength, tensile strength, and elongation-at-break of 3 wt% ZnO/PTFE/PI nanocomposite are enhanced by 85, 5, and 10% compared to pure PTFE/PI blend. Microstructure investigation reveals that ZnO nanoparticles facilitate the formation of continuous, uniform, and smooth transfer film and thus reduce the adhesive wear of PTFE/PI.
37
Liu, Hao, Chengdi Li, Simin Chen, Ping Chen, Jinbo Li, Huihua Jian, Guoyi Guo, Xiao Chen, Xiaofeng Zhu, and Jun Wu. "Fabrication of 3D Printed Polylactic Acid/Polycaprolactone Nanocomposites with Favorable Thermo-Responsive Cyclic Shape Memory Effects, and Crystallization and Mechanical Properties." Polymers 15, no. 6 (March 20, 2023): 1533. http://dx.doi.org/10.3390/polym15061533.
Full textAbstract:
In this work, 3D printed polylactic acid (PLA)/polycaprolactone (PCL) nanocomposites with favorable thermo-responsive cyclic shape memory effects (SMEs) and crystallization and mechanical properties were fabricated using a two-step method. First, an isocyanate-terminated PCL diol (PCL-NCO) was synthesized through the reaction between isocyanate groups of hexamethylene diisocyanate and active hydroxyl groups of PCL diol, and its physicochemical properties were characterized. A PLA/PCL blend with a PCL content of 50 wt% was fabricated via fused filament fabrication (FFF) 3D printing, and the influence of the PCL-NCO on the SME of the PLA/PCL blend was studied. The results indicated that the PCL-NCO significantly improved the cyclic shape memory performance of 3D printed PLA/PCL blends and was proved to be an effective interface compatibilizer for the blend system. Subsequently, the structure and properties of 3D printed PLA/PCL nanocomposites were investigated in detail by adding cellulose nanocrystal-organic montmorillonite (CNC-OMMT) hybrid nanofillers with different contents. It was found that the hybrid nanofillers greatly enhanced crystallization and mechanical properties of the nanocomposites due to adequate dispersion. The modification of the PLA/PCL blend and the preparation of the 3D printed nanocomposite can not only prolong the service life of a shape memory polymer product, but also broaden its application scope in advanced fields.
38
Kamarudin, Siti Noorhazirah, Kwan Yiew Lau, Chee Wei Tan, and Kuan Yong Ching. "The Role of Silicon-Based Nanofillers and Polymer Crystallization on the Breakdown Behaviors of Polyethylene Blend Nanocomposites." Nano 15, no. 08 (August 2020): 2050097. http://dx.doi.org/10.1142/s1793292020500976.
Full textAbstract:
Good breakdown strength is an important feature for the selection of dielectric materials, especially in high-voltage engineering. Although nanocomposites have been shown to possess many promising dielectric properties, the breakdown strength of nanocomposites is often found to be negatively affected. Recently, imposing nonisothermal crystallization processes on polyethylene blends has been demonstrated to be favorable for breakdown strength improvements of dielectric materials. In an attempt to increase nanocomposites’ voltage rating, this work reports on the effects of nonisothermal crystallization (fast, moderate and slow crystallizations) on the structure and dielectric properties of a polyethylene blend (PE) composed of 80% low density polyethylene and 20% high density polyethylene, added with silicon dioxide (SiO2) and silicon nitride (Si3N4) nanofillers. Through breakdown testing, the breakdown performance of Si3N4-based nanocomposites was better than SiO2-based nanocomposites. Since nanofiller dispersion within both nanocomposite systems was comparable, the enhanced breakdown performance of Si3N4-based nanocomposites is attributed to the surface chemistry of Si3N4 containing less hydroxyl groups than SiO2. Furthermore, the breakdown strength of SiO2-based nanocomposites and Si3N4-based nanocomposites improved, with the DC breakdown strength increasing by at least 12% when both the nanocomposites were subjected to moderate crystallization rather than fast and slow crystallizations. This is attributed to changes in the underlying molecular conformation of PE in addition to water-related effects. These results suggest that apart from changes in the nanofiller surface chemistry, changes in the underlying molecular conformation of polymers are also important to improve the breakdown performance of nanocomposites.
39
Oliveira, Maria Roniele Felix, Pilar Herrasti, Roselayne Ferro Furtado, Airis Maria Araújo Melo, and Carlucio Roberto Alves. "Polymeric Composite including Magnetite Nanoparticles for Hydrogen Peroxide Detection." Chemosensors 11, no. 6 (June 1, 2023): 323. http://dx.doi.org/10.3390/chemosensors11060323.
Full textAbstract:
The combination of a biopolymer and a conductive polymer can produce new materials with improved physico-chemical and morphological properties that enhance their use as sensors. Magnetite nanoparticles (MN) can be further introduced to these new matrices to improve the analytical performance. This study aimed to evaluate the electrocatalytic response of nanocomposites formed by the introduction of MN to polypyrrole (PPy) doped in the presence of cashew gum polysaccharide (CGP) and in the presence of carboxymethylated cashew gum polysaccharide (CCGP). Characterization of the nanocomposites was carried out via transmission electron microscopy (TEM) and infrared spectroscopy (FTIR) and showed that the absorption band of the blend was shifted to a higher frequency in the nanocomposites, indicating the intermolecular interaction between the blend and nanoparticles. The electrocatalytic performance of the nanocomposites was evaluated by applying a constant potential of −0.7 V with successive additions of H2O2 (1 mmol L−1) in 10 mmol L−1 phosphate buffer under agitation at pH 7.5. The nanocomposite formed by the introduction of MN to polypyrrole doped with cashew gum polysaccharide (PPy(cgp)–MN) displayed excellent electrocatalytic surface properties, with high H2O2 specificity, a linear response (R2 = 0.99), high sensitivity (0.28 µmol L−1), and a low H2O2 detection limit (0.072 mmol L−1).
40
Tarawneh, Mou’ad A., Sahrim Ahmad, and Ruey Shan Chen. "Mechanical, thermal, and electrical properties of graphene oxide–multiwalled carbon nanotubes-filled thermoplastic elastomer nanocomposite." Journal of Elastomers & Plastics 49, no. 4 (August 9, 2016): 345–55. http://dx.doi.org/10.1177/0095244316661753.
Full textAbstract:
This article studies the enhancement in the properties of thermoplastic natural rubber (TPNR) reinforced by graphene oxide (GnO) and multiwalled carbon nanotubes (MWCNTs). TPNR is a blend of polypropylene and liquid natural rubber (NR), which is used as a compatibilizer and NR at a percentage of volume ratio 70:10:20, respectively. Using TPNR as the host matrix, a number of TPNR/carbon nanotubes (CNTs), TPNR/GnO, and hybrid TPNR/GnO/CNTs nanocomposites are processed and their mechanical, thermal, and electrical properties are characterized. The results extracted from tensile and impact test showed that tensile strength, Young’s modulus, and storage modulus of TPNR/GnO/MWCNTs hybrid nanocomposite increased as compared with TPNR composite and TPNR/GnO nanocomposite but lower than TPNR/MWCNTs nanocomposite. On the other hand, the elongation at break considerably decreased with increasing the content of both types of nanoparticles. Based on the experimental results, the thermal, electrical conductivity of a 0.5 wt% MWCNTs-reinforced sample increased as compared with a pure TPNR and other MWCNTs/GnO-reinforced composites. The improved dispersion properties of the nanocomposites can be due to altered interparticle interactions. MWCNTs, GnO, and MWCNTs–GnO networks are well combined to generate a synergistic effect that is shown by scanning electron microscopy micrographs. With the existence of this network, the mechanical, thermal, and electrical properties of the nanocomposite were improved significantly.
41
Diken, Mehmet Emin, Berna Koçer Kizilduman, Begümhan Yilmaz Kardaş, Enes Emre Doğan, Mehmet Doğan, Yasemin Turhan, and Serap Doğan. "Synthesis, characterization, and their some chemical and biological properties of PVA/PAA/nPS hydrogel nanocomposites: Hydrogel and wound dressing." Journal of Bioactive and Compatible Polymers 35, no. 3 (May 2020): 203–15. http://dx.doi.org/10.1177/0883911520921474.
Full textAbstract:
The nanocomposite hydrogels were prepared by dispersing of the nanopomegranate seed particles into poly(vinyl alcohol)/poly(acrylic acid) blend matrix in an aqueous medium by the solvent casting method. These hydrogels were characterized using scanning electron microscopy, Fourier transform infrared spectra, differential scanning calorimetry, and optical contact angle instruments. The nanopomegranate seed, blend, and hydrogel nanocomposites were tested for microbial activity. In addition, cytocompatibilities of these blend and hydrogel nanocomposites/composites were tested on human lymphocyte with in vitro MTS cell viability assays. Fourier transform infrared spectra revealed that esterification reaction took place among functional groups in the structure of poly(vinyl alcohol) and poly(acrylic acid). The hydrophilic properties of all hydrogels decreased with increasing nanopomegranate seed content. The mean diameters of the nanopomegranate seed particles were about 88 nm. Nanopomegranate seed particles demonstrated antibacterial properties against gram-positive bacteria, Staphylococcus aureus, and gram-negative bacteria, Escherichia coli. The lymphocyte viabilities increased after addition of nanopomegranate seeds into the polymer blend. The swelling behavior of blend and hydrogels was dependent on the cross-linking density created by the reaction between poly(vinyl alcohol)/poly(acrylic acid) blend and nanopomegranate seed. Scanning electron microscopy images were highly consistent with Fourier transform infrared spectra, differential scanning calorimetry, and antibacterial activity results.
42
Seraji, Amir Abbas, and Amir Ali Bajgholi. "Dual role of nanoclay in the improvement of the in-situ nanofibrillar morphology in polypropylene/polybutylene terephthalate nanocomposites." Journal of Industrial Textiles 52 (August 2022): 152808372211335. http://dx.doi.org/10.1177/15280837221133570.
Full textAbstract:
The present study has addressed the effects of nanoclay on the properties of polypropylene (PP)/polybutylene terephthalate (PBT) blend fibers such as their dyeability and, rheological and resiliency behaviors which are produced by melt spinning. The results of the differential scanning calorimetry (DSC) analysis indicated that the presence of both nanoclay and PBT significantly influenced the crystallinity of PP which also confirmed their nucleating effects on the nanocomposite fibers. Compared to neat PP fibers, the incorporation of 0.5–1wt.% of nanoclay and 10 wt.% of PBT nanocomposite fibers caused approximately 23% and 52% enhancements in the resiliency and dye uptake respectively without using toxic carriers. The rheological analysis was carried out for investigating the viscoelastic behavior, and microstructural and dispersion of nanoclay in the nanocomposite fibers. The rheological behavior in the small amplitude oscillatory shear (SAOS) test demonstrated the percolation threshold network of the structure of PBT fibrils in the PP matrix. When the PBT domains are fibrillated, the storage modulus (G′) and complex viscosity increase compared to neat PP. Also, the nonterminal behavior at low frequencies indicates the uniform dispersion of nanoclay in fiber nanocomposites. These all cause the improvement of the melt strength of the PP matrix. Transmission electron microscopy (TEM) was used to study the dispersion and localization of nanoclay. Nanoclay has also played a compatibilizing role in the immisible PP/PBT blend and was localized mainly in the PBT disperse and interface, and therefore prevented coalescence. The role of the compatibility of nanoparticles is to decrease the mean diameter of the nano-fibrils to 75 nm, for the hot-drawn nanocomposite fibers, as measured by scanning electron microscopy (SEM). All of the above lead to increasing the melt strength and elasticity of the nanocomposites in the fiber spinning process.
43
Azubuike, Lilian, Jun Wang, and Uttandaraman Sundararaj. "Carbon Nanotube Migration in a Compatibilized Blend System, Leading to Kinetically Induced Enhancement in Electrical Conductivity and Mechanical Properties." Nanomaterials 13, no. 6 (March 14, 2023): 1039. http://dx.doi.org/10.3390/nano13061039.
Full textAbstract:
Kinetic factors that facilitate carbon nanotube (CNT) migration in a polymer blend from a high-density polyethylene (HDPE) phase to a poly (p-phenylene ether) (PPE) phase were studied, with the objective to induce CNT migration and localization at the interface. Herein, a CNT filler was pre-localized in an HDPE polymer and then blended with PPE at different blend compositions of 20:80, 40:60, 60:40, and 80:20 of PPE/HDPE at a constant filler concentration of 1 wt%. The level of CNT migration was studied at different mixing times of 5 and 10 min. The electrical conductivity initially increased by 2–3 orders of magnitude, with an increase in the PPE content up to 40%, and then it decreased significantly by up to 12 orders of magnitude at high PPE content up to 100%. We determined that the extent of migration was related to the difference in the melt viscosity between the constituent polymers. A triblock copolymer styrene-ethylene/butylene-styrene (SEBS) was used to improve the blend miscibility, and 2 wt% copolymer was found to be the optimum concentration for the electrical properties for the two blend compositions of 20:80 and 80:20 of PPE/HDPE, at a constant filler concentration of 1 wt%. The introduction of the SEBS triblock copolymer significantly increased the conductivity almost by almost four orders of magnitude for PPE/HDPE/80:20 composites with 1 wt% CNT and 2 wt% SEBS compared to the uncompatibilized blend nanocomposite. The mechanical strength of the compatibilized blend nanocomposites was found to be higher than the unfilled compatibilized blend (i.e., without CNT), uncompatibilized blend nanocomposites, and the pristine blend, illustrating the synergistic effect of adding nanofillers and a compatibilizer. SEM and TEM microstructures were used to interpret the structure–property relationships of these polymer blend nanocomposites.
44
Kim, Cheol Ho, Hae Do Jung, Jang Oo Lee, and Nam Ju Jo. "Organic-Inorganic Nanocomposite Electrodes for Dielectric Elastomer Actuator." Key Engineering Materials 336-338 (April 2007): 323–26. http://dx.doi.org/10.4028/www.scientific.net/kem.336-338.323.
Full textAbstract:
This study dealt with the Maxwell stress effect of waterborne polyurethane (WPU)/ conductive filler nanocomposite, which was a promising candidate for a material to be used in dielectric elastomer actuator electrode. Conductive nanocomposites were produced by using three types of conductive filler such as carbon black (CB), vapor grown carbon fiber (VGCF), and silver powder (Ag). Among them, conductive nanocomposite containing VGCF exhibited the lowest threshold concentration. And the blend of CB and VGCF (CB/VGCF) filler had a synergistic effect to electrical conductivity. Actuation test showed that CB/VGCF nanocomposite electrode had the largest displacement. Then it could be stated that the improvement of the displacement in CB/VGCF nanocomposite electrode was originated from the increase in relative dielectric constant. In addition, a unique feature of the hysteresis in the bending deformation was described. The feature is that the prior application of an electric field significantly improves the bending speed in the successive application.
45
Reddy, A. Damodara, and M. L. S. Deva Kumar. "Thermal, Morphological Analysis of Epoxy/Unsaturated Polyester Blended Nanocomposite with Wollastonite Powder as a Particulate." Asian Journal of Chemistry 31, no. 9 (July 31, 2019): 2069–72. http://dx.doi.org/10.14233/ajchem.2019.22123.
Full textAbstract:
In the proposed research article, polymer nanocomposites on the basis of thermoset polymer resultant blends (epoxy/polyester) having wollastonite powder are prepared by high shear mixer (mechanical), followed by an ultra-sonicator for uniform dispersion of wollastonite particulates in the final blend matrix. Wide range percentages of modified wollastonite nano-particulates with 0, 1, 2, 3, 4 and 5 wt. % were incorporated into the epoxy/polyester blend matrix in order to evaluate the effect of nanofillers on nanophase morphological structure and to study material properties. Various thermal parameters of the nanocomposite were evaluated using thermogravimetric analysis and differential scanning calorimetry techniques. Further, the scanning electron microscopy images have been employed to know fractured surfaces of the titled compound. From the experimental data it was found that uniform miscibility of epoxy/polyester blend mix and homogenous dispersion of wollastonite nano particulates in the blend matrix was noticed. From the TGA studies, 8 % weight loss and 4 °C rise in decomposition temperature was observed with addition of 5 wt. % wollastonite when compared with the 0 wt. % wollastonite combination of epoxy/unsaturated polyester resin blend. DSC results further revealed that the modified wollastonite nanoparticles is major responsible for the glass transition temperature (Tg) of the nanocomposites.
46
Hairaldin, Siti Zulaiha, Wan Md Zin Wan Yunus, and Nor Azowa Ibrahim. "Effect Addition of Octadecylamine Modified Clay (ODA-MMT) to Polylactide/Polycaprolactone (PLA/PCL) Blend." Advanced Materials Research 364 (October 2011): 317–21. http://dx.doi.org/10.4028/www.scientific.net/amr.364.317.
Full textAbstract:
In this study, Octadecylamine Modified montmorillonites (ODAMMT) were used to prepare polylactide/polycaprolactone (PLA/PCL) clay nanocomposites. PLA and PCL were blend using an internal mixer by melt blending method. The other sample was blend with natrium monmorillonite (NaMMT) and Octadecylamine modified monmorillonite to produce PLA/PCL-NaMMT and PLA/PCL-ODAMMT. To characterize the polymer nanocomposite, X-ray diffraction (XRD), FTIR and SEM analysis were conducted. Comparison of morphology were made up between neat PLA/PCL, PLA/PCL with presence of of montmorillonite and octadecylamine modified monmorillonite respectively based on SEM micrograph. The number-average diameter was calculated for PLA/PCL, PLA/PCL-NaMMT, and PLA/PCL-ODAMMT.
47
Bhatia, Amita, Rahul K. Gupta, Sati N. Bhattacharya, and Hyoung Jin Choi. "Analysis of Gas Permeability Characteristics of Poly(Lactic Acid)/Poly(Butylene Succinate) Nanocomposites." Journal of Nanomaterials 2012 (2012): 1–11. http://dx.doi.org/10.1155/2012/249094.
Full textAbstract:
Gas permeability and morphological properties of nanocomposites prepared by the mixing of poly(lactic acid) (PLA), poly(butylene succinate) (PBS), and clay was investigated. While the composition of PLA and PBS polymers was fixed as 80% and 20% by weight, respectively, for all the nanocomposites, clay contents varied from 1 to 10 wt%. From the morphological studies using both wide angle X-ray diffraction and transmission electron microscopy, the nanocomposite having 1 wt% of clay was considered to have a mixed morphology of intercalated and delaminated structure, while some clusters or agglomerated particles were detected for nanocomposites having 3 and more than 3 wt% of clay content. However, the average particle size of the dispersed PBS phase was reduced significantly from 7 μm to 30–40 nm with the addition of clay in the blend. The oxygen barrier property was improved significantly as compared to the water vapor. A model based on gas barrier property was used for the validation of the oxygen relative permeabilities of PLA/PBS/clay nanocomposites. PLA/PBS/clay nanocomposites validated the Bharadwaj model up to 3 wt% of clay contents only, while for nanocomposites of higher clay contents the Bharadwaj model was invalid due to the clusters and agglomerates formed.
48
Rostami, Amir, Mehdi Vahdati, Mohsen Nowrouzi, Mohammadreza Karimpour, and Amir Babaei. "Morphology and physico-mechanical properties of poly (methyl methacrylate)/polystyrene/polypropylene ternary polymer blend and its nanocomposites with organoclay: The effect of nature of organoclay and method of preparation." Polymers and Polymer Composites 30 (January 2022): 096739112211078. http://dx.doi.org/10.1177/09673911221107811.
Full textAbstract:
This work presents the role of organoclay type (hydrophilic C30B vs hydrophobic C15A) and feeding mode (sequential vs. simultaneous) on a model ternary blend system poly (methyl methacrylate)/polystyrene/polypropylene (PMMA/PS/PP, 80/05/15). The rheological and thermal properties of these nanocomposites are linked to their morphology, which is mainly controlled by the preparation method and the nature of the organoclays. Using oscillatory shear rheology and dynamic mechanical analyses, both organoclays were shown to be mainly localized in the PMMA matrix. However, the more polar C30B showed a greater affinity toward the matrix. Studying the morphology using electron microscopy revealed that at 1 wt% of the organoclays, the original core-shell morphology of the blend was retained regardless of the feeding sequence. At 3 wt% of the organoclays, however, the core-shell morphology was only retained in the case of C30B-based nanocomposites prepared using sequential feeding mode. In the other cases, the increased solid-like behavior of the PS phase prevented the formation of a shell. Overall, it was shown that the feeding sequence and the affinity of organoclays towards different blend components determined their localization and therefore the eventual morphology of the nanocomposite.
49
Elhosiny Ali, H., Z. R. Khan, H. Algarni, E. F. El-Shamy, Mohd Shkir, and Yasmin Khairy. "Engineering the Physical Properties of Polyvinyl Pyrrolidone/Polyvinyl Alcohol Blend Films by Adding Tb–NiO Nanoparticles for Flexible Optoelectronics Applications." Journal of Nanoelectronics and Optoelectronics 17, no. 3 (March 1, 2022): 374–82. http://dx.doi.org/10.1166/jno.2022.3216.
Full textAbstract:
Polyvinyl pyrrolidone (PVP)-polyvinyl alcohol (PVA) (1:1) polymer mixture films were developed using the solution-casting technique. Physical properties engineering of as grown chemical casting films were achieved through the Tb–NiO nanoparticles mixing in a polymer blend with different content of 0.0, 0.037, 0.37, 1.85, and 3.7 wt%. The variation of physical properties of nanocomposites thin layer was examined from X-ray diffractometer, atomic force microscope (AFM), FTIR spectroscopy, and Uv-visible spectroscopy. Optical band gaps of polymer nanocomposites films were calculated to study the influence of Tb–NiO nanoparticle doping are decreased after addition of Tb–NiO nanostructures in the composites. AFM images of films reveal successful adsorption of Tb–NiO nanoparticles in polymer blend. In addition, FTIR spectra showed successful loading of Tb–NiO nanoparticles in PVP/PVA blend matrix. The extinction coefficients, refractive index, optical dielectric constant and optical conductivity were also investigated in correlation with different wt% Tb–NiO doping concentrations. In addition, the values of oscillator, dispersion energies Eo, Ed and static refractive indices no were calculated. The optical limiting behavior of films showed that the polymer nanocomposite films are suitable for flexible optoelectronics devices.
50
Falqi, Fahad H., Osamah A. Bin-Dahman, M. Hussain, and Mamdouh A. Al-Harthi. "Preparation of Miscible PVA/PEG Blends and Effect of Graphene Concentration on Thermal, Crystallization, Morphological, and Mechanical Properties of PVA/PEG (10 wt%) Blend." International Journal of Polymer Science 2018 (September 12, 2018): 1–10. http://dx.doi.org/10.1155/2018/8527693.
Full textAbstract:
Water-soluble polymers such as poly(vinyl alcohol) (PVA) and poly(ethylene glycol) (PEG) and their nanocomposites with graphene were prepared by using a solution mixing and casting technique. The effect of different PEG loadings was investigated to determine the optimum blend ratio. The films were characterized using Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), and thermogravimetric analyzer (TGA) methods. Also, the mechanical properties including tensile strength and elongation at break were measured using a universal tensile testing machine. FTIR results confirmed the formation of the H-bond between PEG and PVA. DSC studies revealed that PEG has a significant plasticization effect on PVA as seen by the drop in the glass transition temperature (Tg). The blend with 10 wt% PEG loading was found to be the optimum blend because of good compatibility as shown by FTIR and SEM results and improved thermal properties. PVA/PEG (10%) nanocomposites were prepared using graphene as a nanofiller. It was found that the elongation at break increased by 62% from 147% for the PVA/PEG (10%) blend to 209% for the nanocomposite with graphene loading of 0.2 wt%. The experimental values of tensile strength were compared using the predictive model of Nicolais and Narkis.