Artykuły w czasopismach: „Polyethylene nanocomposites”

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Zazoum, B., E. David i 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.

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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.

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Rodrigues, Tathiane, Maria Tavares, Igor Soares, Ana Moreira i Antonio Ferreira. "The Use of Solid State NMR to Characterize High Density Polyethylene/Organoclay Nanocomposites". Chemistry & Chemical Technology 3, nr 3 (15.09.2009): 187–90. http://dx.doi.org/10.23939/chcht03.03.187.

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Recently the development of new materials, in special polymeric nanocomposites, formed by polymer and layered silicates, have gained attention. In this work nanocomposites based on high-density polyethylene matrix (HDPE) and organically modified clay were prepared by melt processing and characterized by the determination of proton spin-lattice relaxation time through solid state nuclear magnetic resonance (NMR) spectroscopy. This work has a proposal to add one quantitative technique to help the researchers to better evaluate polymeric nanocomposite, because NMR is an important tool employed to study both molecular structure and dynamic molecular behavior. The nanocomposites were mixed in a twin-screw extruder, varying the shear rate parameter: 60 and 90 rpm at 463 K. Nanocomposites obtained were characterized through X-ray diffraction; thermal analysis; impact resistance and nuclear magnetic resonance. The T1H results showed that the samples present different molecular domains according to the clay dispersion, forming an intercalated and/or exfoliated nanocomposites. The measurement of relaxation time, using low field NMR, is a useful method to evaluate changes in the molecular mobility of nanocomposite and can infer whether the sample is exfoliated and/or intercalated, since lamellar filler is used.

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Vigneshwaran, N., A. K. Bharimalla, Virendra Prasad, A. A. Kathe i R. H. Balasubramanya. "Functional Behaviour of Polyethylene-ZnO Nanocomposites". Journal of Nanoscience and Nanotechnology 8, nr 8 (1.08.2008): 4121–26. http://dx.doi.org/10.1166/jnn.2008.an48.

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Hybrid inorganic–organic nanocomposite materials are of current interest because of their multi-functionality, ease of processability, and potential for large-scale manufacturing. The focus of this study is to ascertain the functional properties of the commodity plastic impregnated with ZnO/starch nanocomposites. ZnO/starch nanocomposites was prepared by a simple process using zinc nitrate and sodium hydroxide as precursor and soluble starch as stabilizing agent. The peak obtained in terms of wavelength from UV-visible spectrum is converted in terms of particle size using effective mass approximation method. The plastic sheet of 50 μm thickness was prepared by hot blow method using 1:1 ratio of HDPE:LLDPE and 1% concentration of ZnO/starch nanocomposites. The morphological analysis was carried out using both optical and scanning electron microscopy. For antibacterial activity, evaluation was carried out with Staphylococcus aureus (AATCC 6538), a Gram-positive bacterium and Klebsiella pneumoniae (AATCC 4352), a Gram-negative bacterium. Excellent UV blocking ability was noticed in nanocomposites when compared to the control.

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Ahangaran, Fatemeh, Ali Hassanzadeh, Sirous Nouri i Rasoul Esmaeely Neisiany. "Investigation of thermal and dielectric properties of Fe3O4/high-density polyethylene nanocomposites". Journal of Composite Materials 51, nr 28 (26.02.2017): 3923–29. http://dx.doi.org/10.1177/0021998317695419.

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High-density polyethylene nanocomposites containing Fe3O4 nanoparticles were prepared by employing melt mixing process. The amorphous Fe3O4 nanoparticles with average size about 50 nm were prepared by the conventional coprecipitation method from iron (ΙΙ and ΙΙΙ). Thermal and dielectric properties of high-density polyethylene and its nanocomposites were investigated via differential scanning calorimetry and electrochemical impedance spectroscopy. The crystalline structure of high-density polyethylene and Fe3O4/high-density polyethylene nanocomposite were studied by wide-angle X-ray diffraction, which confirmed orthorhombic crystalline structure. The results of thermal and dielectric analysis indicated that the addition of Fe3O4 nanoparticles to high-density polyethylene matrix leads to decreasing degree of crystallinity and improvement of dielectric constant.

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Bugaev, N. M., Ekaterina L. Kuznetsova i Kyaw Ye Ko. "Thermophysical and Magnetic Properties of Magnetite – Polyethylene Composite". International Journal of Mechanics 15 (9.09.2021): 165–71. http://dx.doi.org/10.46300/9104.2021.15.19.

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In this work, it is shown that the advantage of using matrix-stabilized magnetic nanoparticles to obtain polymer nanocomposites based on them is that such nanoparticles retain their dispersion and stability of size and shape in the technological modes of obtaining polymer nanocomposite materials, and thus ensured stable ferro- and superparamagnetic properties of the obtained target products. For the production of films by the method of hot pressing from blanks obtained in an injection molding machine or a mechanochemical mixture, a manual electrically heated hydraulic press was used. The magnetic properties of nanocomposite samples (about 50 mg on average) were studied using a vibration magnetometer. The character of the dependence of the magnetization on the magnitude of the magnetic field confirms the ferromagnetic character of the behavior of the obtained nanocomposites. The resulting film nanocomposites exhibit ferromagnetic properties at room temperature.

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Kamarudin, Siti Noorhazirah, Kwan Yiew Lau, Chee Wei Tan i Kuan Yong Ching. "The Role of Silicon-Based Nanofillers and Polymer Crystallization on the Breakdown Behaviors of Polyethylene Blend Nanocomposites". Nano 15, nr 08 (sierpień 2020): 2050097. http://dx.doi.org/10.1142/s1793292020500976.

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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.

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Okolo, Chinyere, Rafaila Rafique, Sadia Sagar Iqbal, Mohd Shahneel Saharudin i Fawad Inam. "Carbon Nanotube Reinforced High Density Polyethylene Materials for Offshore Sheathing Applications". Molecules 25, nr 13 (27.06.2020): 2960. http://dx.doi.org/10.3390/molecules25132960.

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Multiwall carbon nanotube (CNT)-filled high density polyethylene (HDPE) nanocomposites were prepared by extrusion and considered for their suitability in the offshore sheathing applications. Transmission electron microscopy was conducted to analyse dispersion after bulk extrusion. Monolithic and nanocomposite samples were subjected to accelerated weathering and photodegradation (carbonyl and vinyl indices) characterisations, which consisted of heat, moisture (seawater) and UV light, intended to imitate the offshore conditions. The effects of accelerated weathering on mechanical properties (tensile strength and elastic modulus) of the nanocomposites were analysed. CNT addition in HDPE produced environmentally resilient nanocomposites with improved mechanical properties. The energy utilised to extrude nanocomposites was also less than the energy used to extrude monolithic HDPE samples. The results support the mass substitution of CNT-filled HDPE nanocomposites in high-end offshore applications.

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Olkhov, Anatoliy, i Gennady Zaikov. "Nanocomposites Based on Polyethylene and Nanocrystalline Silicon Films". Vestnik Volgogradskogo gosudarstvennogo universiteta. Serija 10. Innovatcionnaia deiatel’nost’, nr 6 (15.12.2014): 63–72. http://dx.doi.org/10.15688/jvolsu10.2014.6.6.

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Sangawar, Vijaya S., i Manisha C. Golchha. "Optical Properties of ZnO/Low Density Polyethylene Nanocomposites". International Journal of Scientific Research 2, nr 7 (1.06.2012): 490–92. http://dx.doi.org/10.15373/22778179/july2013/169.

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Qin, Jun, Huan Zhang, Li Ping Chen i Jie Yu. "The Structure and Properties of HDPE/EAA-Hydrotalcite Master Batch Nanocomposites". Advanced Materials Research 450-451 (styczeń 2012): 715–18. http://dx.doi.org/10.4028/www.scientific.net/amr.450-451.715.

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The High-density polyethylene (HDPE) / the ethylene acrylic acid (EAA) - layered double hydroxide (LDH) nanocomposites were prepared by melt blending with EAA)/ LDH master batch; and the structure and properties of this nanocomposite were studied. The results showed that the EAA acted as an effective compatibilizer for the nanocomposites can enhance the interfacial adhesion between LDH and HDPE obviously, promote the dispersion of LDH in the matrix, increase both the tensile strength and toughness of nanocomposites, and improve the thermal stability and delay the onset decomposition temperature of nanocomposites.

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Jamal, N. A., Hazleen Anuar i Shamsul Bahri A. Razak. "The Effects of High Energy Radiation on the Tensile Properties of Rubber Toughened Nanocomposites". Advanced Materials Research 264-265 (czerwiec 2011): 765–70. http://dx.doi.org/10.4028/www.scientific.net/amr.264-265.765.

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Composites based on high density polyethylene (HDPE), ethylene propylene diene monomer (EPDM) and Organically Modified Montmorillonite (OMMT) clays were made by melt compounding followed by compression molding. Mechanical properties, X-ray diffraction (XRD) and Transmission Electron Microscopy (TEM) were used to characterize the nanocomposites. The addition of clay, compatibilizer agent, Maleic Anhydride Polyethylene (MAPE) and irradiation technique, High Energy Electron Beam (EB) considerably improved the properties of nanocomposites. Tensile Strength and Modulus (MPa) were found to increase significantly with increasing clay content and decreasing as the clay content exceeds 4 vol%. The largest improvement in nanocomposite tensile properties occurred at clay loading of 4 vol% (2-8 vol%) with irradiation technique. The d spacings of the clay in nanocomposites were monitored using XRD and the extent of delamination was examined by TEM. TEM photomicrographs illustrated the intercalated and exfoliated structures of the nanocomposites with OMMT, MAPE and irradiation process.

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Xiong, Qi-lin, i Xiao-geng Tian. "Atomistic Modeling of Mechanical Characteristics of CNT-Polyethylene with Interfacial Covalent Interaction". Journal of Nanomaterials 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/237520.

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The mechanical properties of carbon nanotube- (CNT-) reinforced polyethylenes (PE) with interfacial covalent bonded interaction are investigated using molecular dynamics simulations. A reactive force field for hydrocarbons (ReaxFF) is used in the nanocomposite system. Through a series of the tensile and pullout tests of carbon nanotube-reinforced polyethylene, Young’s modulus and the interfacial shear stress of the nano-reinforced polyethylene are obtained. The comparisons between the MD results of this work and the relevant experimental data of the existing literature are made and the results show that the interfacial covalent bonded interaction between CNTs and the polymer matrix is indispensable. The bond interaction plays the main role in the load transfer of nanocomposites. In addition, the influences of carbon nanotube embedded length and diameter on the interfacial mechanical properties also are studied.

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Li, Qi, Jong Wan Kim, Tae Hee Shim, Yun Ki Jang i Joong Hee Lee. "Positive Temperature Coefficient Behavior of the Graphite Nanofibre and Carbon Black Filled High-Density Polyethylene Hybrid Composites". Advanced Materials Research 47-50 (czerwiec 2008): 226–29. http://dx.doi.org/10.4028/www.scientific.net/amr.47-50.226.

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The graphite nanofiber (GNF) and carbon black filled high-density polyethylene (HDPE) hybrid nanocomposites were prepared by solution mixing and melt blending techniques. The effect of addition of GNF on the positive temperature coefficient (PTC) behavior of the nanocomposites was investigated. The incorporation of small amount of GNF into HDPE/CB composites showed a significant improvement in PTC intensity and repeatability of the hybrid nanocomposites. The maximum PTC intensity was observed for the HDPE/CB/GNF (80/20/0.25) nanocomposite with a relatively low room temperature resistivity.

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Nguyen, Chinh Thuy, Hoang Thai i Mai Thi Tran. "EFFECT OF SOME ADDITIVES ON PROCESSBILITY, MECHANICAL PROPERTIES AND MORPHOLOGY OF POLYOXYMETHYLENE/SILICA NANOCOMPOSITES". Vietnam Journal of Science and Technology 56, nr 3B (13.09.2018): 159. http://dx.doi.org/10.15625/2525-2518/56/3b/12711.

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Using additives for polyoxymethylene/silica (POM/SiO2) nanocomposite system is one of suitable solutions to improve processbility, mechanical properties, especially, elongation at break of the material. In this paper, the effect of some additives on the processbility, mechanical properties and morphology of polyoxymethylene/silica (POM/SiO2) nanocomposite was investigated. Zinc stearate (under the commercial name ultraflow – UTF), ethylene-vinyl acetate copolymer (EVA), linear low density polyethylene (LLDPE) and polylactic acid grafted 5 wt.% of polyethylene glycol (PELA) were used as additives for the nanocomposites. The obtained results showed that the preparing process of the POM/SiO2 nanocomposite becam more easily in the presence of PELA, UTF and EVA, corresponding to a lower torque and mixing energy. The PELA caused decrease in the E-modulus or hardness and increase in elongation at break as well as tensile strength of the POM/SiO2 nanocomposites. The SEM images showed that POM and nanosilica were less compatible in the nanocomposite using EVA, LLDPE and UTF and they were more compatible with using PELA.

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Kurbanova, N. I., N. A. Mirzoeva, N. Ya Ishenko i E. B. Zeynalov. "Obtaining and studying the properties of composites based on high pressure polyethylene with cobalt-containing nanofi llers". Plasticheskie massy 1, nr 11-12 (20.01.2022): 43–45. http://dx.doi.org/10.35164/0554-2901-2021-11-12-43-45.

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The effect of cobalt nanoparticles stabilized by a polyethylene matrix on the physical-mechanical and thermal properties of nanocomposites based on low density polyethylene was studied using X-ray phase (XRD) and differential thermal (DTA) analyzes.An improvement in the strength and deformation parameters, as well as the thermal-oxidative stability of the obtained nanocomposites was revealed, which can be attributed to the effects of structural modification of the polymer matrix.Small amounts of nanofiller introduced into the polymer play the role of structure-forming agents - artificial nuclei of crystallization, which contributes to the formation of a small-spherolite structure in the polymer, characterized by improved physical, mechanical and thermal properties of the obtained nanocomposite.

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Ramazanov, MA, FV Hajiyeva, AM Maharramov i HM Mamedov. "Microwave absorption of polymer nanocomposites on the base high-density polyethylene and magnetite nanoparticles". Journal of Elastomers & Plastics 51, nr 2 (12.04.2018): 130–42. http://dx.doi.org/10.1177/0095244318768652.

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In this article, we report about the synthesis of magnetic polymer nanocomposites comprising magnetite (Fe3O4) nanoparticles in a polyethylene (PE) matrix. The structure and composition of nanocomposite materials using scanning electron microscopy and atomic force microscopy have been studied. It has been defined that the agglomeration of nanoparticles does not occur, by increasing the volume content of nanoparticles up to 60%, and Fe3O4 nanoparticles act out like single-domain particles. It has also been revealed that nanocomposites based on PE + Fe3O4 with nanoparticle content in a polymer matrix up to 60% behave like superparamagnetic particles. It has also been revealed that the PE + Fe3O4-based nanocomposites effectively absorb the electromagnetic waves in the high frequency range of 0.1–30 GHz. It is shown that the properties of ultrahigh electromagnetic waves can be varied by varying the thickness of the nanocomposite films and the concentration of Fe3O4 nanoparticles.

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Zaccardi, Federica, Elisa Toto, Shreya Rastogi, Valeria La Saponara, Maria Gabriella Santonicola i Susanna Laurenzi. "Impact of Proton Irradiation on Medium Density Polyethylene/Carbon Nanocomposites for Space Shielding Applications". Nanomaterials 13, nr 7 (6.04.2023): 1288. http://dx.doi.org/10.3390/nano13071288.

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The development of novel materials with improved radiation shielding capability is a fundamental step towards the optimization of passive radiation countermeasures. Polyethylene (PE) nanocomposites filled with carbon nanotubes (CNT) or graphene nanoplatelets (GNP) can be a good compromise for maintaining the radiation shielding properties of the hydrogen-rich polymer while endowing the material with multifunctional properties. In this work, nanocomposite materials based on medium-density polyethylene (MDPE) loaded with different amounts of multi-walled carbon nanotubes (MWCNT), GNPs, and hybrid MWCNT/GNP nanofillers were fabricated, and their properties were examined before and after proton exposure. The effects of irradiation were evaluated in terms of modifications in the chemical and physical structure, wettability, and surface morphology of the nanocomposites. The aim of this work was to define and compare the MDPE-based nanocomposite behavior under proton irradiation in order to establish the best system for applications as space shielding materials.

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Kirshanov, Kirill, Roman Toms, Pavel Melnikov i Alexander Gervald. "Unsaturated Polyester Resin Nanocomposites Based on Post-Consumer Polyethylene Terephthalate". Polymers 14, nr 8 (14.04.2022): 1602. http://dx.doi.org/10.3390/polym14081602.

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A method for producing nanocomposites of unsaturated polyester resins (UPR) based on recycled polyethylene terephthalate (PET) as a matrix has been proposed. The upcycling method involves three successive stages: (1) oligoesters synthesis, (2) simultaneous glycolysis and interchain exchange of oligoesters with PET, (3) interaction of the obtained resins with glycol and maleic anhydride. UPRs were characterized by FTIR spectroscopy and gel permeation chromatography. The mechanical properties of nanocomposites obtained on the basis of these resins and titanium dioxide have been investigated. It has been shown that 1,2-propylene glycol units, despite their lower reactivity, significantly improve the properties of UPR. The most promising nanocomposite sample exhibited tensile strength 112.62 MPa, elongation at break 157.94%, and Young’s modulus 29.95 MPa. These results indicate that the proposed method made it possible to obtain nanocomposites with high mechanical properties based on recycled PET thus allowing one to create a valuable product from waste.

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Bieligmeyer, Matthias, Sara Mehdizadeh Taheri, Ian German, Christophe Boisson, Christian Probst, Wolfgang Milius, Volker Altstädt i in. "Completely Miscible Polyethylene Nanocomposites". Journal of the American Chemical Society 134, nr 44 (30.10.2012): 18157–60. http://dx.doi.org/10.1021/ja307297c.

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Ali, Nasar, Dorina Chipara, Karen Lozano, James Hinthorne i Mircea Chipara. "Polyethylene oxide—fullerene nanocomposites". Applied Surface Science 421 (listopad 2017): 220–27. http://dx.doi.org/10.1016/j.apsusc.2016.11.166.

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Maia, Thiago Henrique Silveira, Nelson Marcos Larocca, Cesar Augusto Gonçalves Beatrice, Aparecido Júnior de Menezes, Gilberto de Freitas Siqueira, Luiz Antonio Pessan, Alain Dufresne, Marcos Pini França i Alessandra de Almeida Lucas. "Polyethylene cellulose nanofibrils nanocomposites". Carbohydrate Polymers 173 (październik 2017): 50–56. http://dx.doi.org/10.1016/j.carbpol.2017.05.089.

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Jamal, Nur Ayuni. "A Linear Relationship between the Mechanical, Thermal and Gas Barrier Properties of MAPE Modified Rubber Toughened Nanocomposites". IIUM Engineering Journal 11, nr 2 (19.11.2010): 225–39. http://dx.doi.org/10.31436/iiumej.v11i2.114.

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Composites based on high density polyethylene (HDPE), ethylene propylene diene monomer (EPDM) and organophilic montmorillonite (OMMT) clays were prepared by melt compounding followed by compression molding. The addition of clay as well as compatibilizer agent (maleic anhydride polyethylene (MAPE)) considerably improved the tensile properties of nanocomposites systems. The largest improvement in mechanical and thermal properties occurred at clay loading levels of 4% (2-8 wt %) with MAPE system. Interestingly, the increased in tensile properties also resulted in improve in thermal and barrier properties. Differential scanning calorimeter analysis (DSC) revealed that the barrier property of nanocomposite was influenced by the crystalline percentage of nanocomposite. Along with crystalline percentage, the crystallization temperature, Tc and melting temperature, Tm were also improved with OMMT and MAPE agent. The d-spacings of the clay in nanocomposites were monitored using x-ray diffraction (XRD) and the extent of delamination was examined by transmission electron microscope (TEM). The wide angle of XRD patterns showed the increased interplanar spacing, d of clay layers, indicating enhanced compatibility between polymer matrix and OMMT with the aid of MAPE agent. TEM photomicrographs illustrated the mixed intercalated and partial exfoliated structures of the nanocomposites with OMMT and MAPE agent.

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Fermas, Walid, Mustapha Kaci, Remo Merijs Meri i Janis Zicans. "Mechanical and Thermal Properties of Ternary System Based on Starch-Grafted-Polyethylene/High Density Polyethylene/Halloysite Nanocomposites". Key Engineering Materials 800 (kwiecień 2019): 210–15. http://dx.doi.org/10.4028/www.scientific.net/kem.800.210.

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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.

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Sepet, Harun, Necmettin Tarakcioglu i RDK Misra. "Effect of inorganic nanofillers on the impact behavior and fracture probability of industrial high-density polyethylene nanocomposite". Journal of Composite Materials 52, nr 18 (7.12.2017): 2431–42. http://dx.doi.org/10.1177/0021998317746477.

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The main purpose of this work is to study how the morphology of nanofillers and dispersion and distribution level of inorganic nanofiller influence the impact behavior and fracture probability of inorganic filler filled industrial high-density polyethylene nanocomposites. For this study, nanoclay and nano-CaCO3 fillers–high-density polyethylene mixings (0, 1, 3, 5 wt.% high-density polyethylene) was prepared by melt-mixing method using a compounder system. The impact behavior was examined by charpy impact test, scanning electron microscopy, and probability theory and statistics. The level of the dispersion was characterized with scanning electron microscopy energy dispersive X-ray spectroscopy analysis. The results showed rather good dispersion of both of inorganic nanofiller, with a mixture of exfoliated and confined morphology. The results indicated that the impact strength of the industrial nanocomposite decreased with the increase of inorganic particulate content. The impact reliability of the industrial nanocomposites depends on the type of nanofillers and their dispersion and distribution in the matrix.

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Nguyen-Tri, Phuong, Van Nguyen i Tuan Nguyen. "Biological Activity and Nanostructuration of Fe3O4-Ag/High Density Polyethylene Nanocomposites". Journal of Composites Science 3, nr 2 (3.04.2019): 34. http://dx.doi.org/10.3390/jcs3020034.

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We report here the synthesis of uniform nanospheres-like silver nanoparticles (Ag NPs, 5–10 nm) and the dumbbell-like Fe3O4-Ag hybrid nanoparticles (FeAg NPs, 8–16 nm) by the use of a seeding growth method in the presence of oleic acid (OA)/oleylamine (OLA) as surfactants. The antibacterial activity of pure nanoparticles and nanocomposites by monitoring the bacterial lag–log growth has been investigated. The electron transfer from Ag NPs to Fe3O4 NPs which enhances the biological of silver nanoparticles has been proven by nanoscale Raman spectroscopy. The lamellae structure in the spherulite of FeAg NPs/High Density Polyethylene (HDPE) nanocomposites seems to play the key role in the antibacterial activity of nanocomposites, which has been proven by nanoscale AFM-IR. An atomic force microscopy coupled with nanoscale infrared microscopy (AFM-IR) is used to highlight the distribution of nanoparticles on the surface of nanocomposite at the nanoscale. The presence of FeAg NPs in PE nanocomposites has a better antibacterial activity than that reinforced by Ag NPs due to the faster Ag+ release rate from the Fe3O4-Ag hybrid nanoparticles and the ionization of Ag NPs in hybrid nanostructure.

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Jose, Cintil, Chin Han Chan, Tan Winie, Blessy Joseph, Abhimanyu Tharayil, Hanna J. Maria, Tatiana Volova i in. "Thermomechanical Analysis of Isora Nanofibril Incorporated Polyethylene Nanocomposites". Polymers 13, nr 2 (19.01.2021): 299. http://dx.doi.org/10.3390/polym13020299.

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The research on cellulose fiber-reinforced nanocomposites has increased by an unprecedented magnitude over the past few years due to its wide application range and low production cost. However, the incompatibility between cellulose and most thermoplastics has raised significant challenges in composite fabrication. This paper addresses the behavior of plasma-modified polyethylene (PE) reinforced with cellulose nanofibers extracted from isora plants (i.e., isora nanofibrils (INFs)). The crystallization kinetics of PE–INF composites were explained using the Avrami model. The effect of cellulose nanofillers on tuning the physiochemical properties of the nanocomposite was also explored in this work. The increase in mechanical properties was due to the uniform dispersion of fillers in the PE. The investigation on viscoelastic properties confirmed good filler–matrix interactions, facilitating the stress transfer.

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Li, Shi Yun, i De Sheng Hu. "Study on the Properties of MWNTs/Polyethylene Nanocomposites by In Situ Polymerization". Applied Mechanics and Materials 192 (lipiec 2012): 289–92. http://dx.doi.org/10.4028/www.scientific.net/amm.192.289.

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Multi–walled carbon nanotubes (MWNTs)/polyethylene (PE) nanocomposites were prepared via in situ polymerization with MWNTs supported Cp2ZrCl2 catalyst. XPS and FESEM results imply that Cp2ZrCl2 catalyst has been immobilized in the surface of the MWNTs supports by a MAO bridge. The efficient dispersion of MWNTs in PE matrix and the strong compressive forces associated with PE on the MWNTs were demonstrated by TEM, FESEM and Raman spectra. With introducing 0.2 wt.-% MWNTs, both the tensile strength and elongation of MWNTs/PE nanocomposite increased by factors of 1.6 (from 29 MPa to 45 MPa) and 1.5 (from 909% to 1360%) comparing with the pure PE, respectively. Morphology observation of fractured surface, in accordance with the Raman results, revealed that the PE firmly adheres to the nanotubes, which is responsible for the significant improvement of the mechanical properties of nanocomposites. Thermal stabilities of the nanocomposites were significantly improved. In addition, the MWNTs/PE nanocomposites show very high UV shielding properties, which could increase photooxidative stability of the PE.

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Ahmad, Ibrahim, Hyun-Kyung Kim, Suleyman Deveci i R. Kumar. "Non-Isothermal Crystallisation Kinetics of Carbon Black- Graphene-Based Multimodal-Polyethylene Nanocomposites". Nanomaterials 9, nr 1 (18.01.2019): 110. http://dx.doi.org/10.3390/nano9010110.

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The effect of carbon black (CB) and microwave-induced plasma graphene (g) on the crystallisation kinetics of the multimodal high-density polyethylene was studied under non-isothermal conditions. The non-isothermal crystallisation behaviour of the multimodal-high-density polyethylene (HDPE), containing up to 5 wt.% graphene, was compared with that of neat multimodal-HDPE and its carbon black based nanocomposites. The results suggested that the non-isothermal crystallisation behaviour of polyethylene (PE)-g nanocomposites relied significantly on both the graphene content and the cooling rate. The addition of graphene caused a change in the mechanism of the nucleation and the crystal growth of the multimodal-HDPE, while carbon black was shown to have little effect. Combined Avrami and Ozawa equations were shown to be effective in describing the non-isothermal crystallisation behaviour of the neat multimodal-HDPE and its nanocomposites. The mean activation energy barrier (ΔE), required for the transportation of the molecular chains from the melt state to the growing crystal surface, gradually diminished as the graphene content increased, which is attributable to the nucleating agent effect of graphene platelets. On the contrary, the synergistic effect resulting from the PE-CB nanocomposite decreased the ΔE of the neat multimodal-HDPE significantly at the lowest carbon black content.

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Kausar, Ayesha, Ishaq Ahmad, Tingkai Zhao, O. Aldaghri i M. H. Eisa. "Polymer/Graphene Nanocomposites via 3D and 4D Printing—Design and Technical Potential". Processes 11, nr 3 (14.03.2023): 868. http://dx.doi.org/10.3390/pr11030868.

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Graphene is an important nanocarbon nanofiller for polymeric matrices. The polymer–graphene nanocomposites, obtained through facile fabrication methods, possess significant electrical–thermal–mechanical and physical properties for technical purposes. To overcome challenges of polymer–graphene nanocomposite processing and high performance, advanced fabrication strategies have been applied to design the next-generation materials–devices. This revolutionary review basically offers a fundamental sketch of graphene, polymer–graphene nanocomposite and three-dimensional (3D) and four-dimensional (4D) printing techniques. The main focus of the article is to portray the impact of 3D and 4D printing techniques in the field of polymer–graphene nanocomposites. Polymeric matrices, such as polyamide, polycaprolactone, polyethylene, poly(lactic acid), etc. with graphene, have been processed using 3D or 4D printing technologies. The 3D and 4D printing employ various cutting-edge processes and offer engineering opportunities to meet the manufacturing demands of the nanomaterials. The 3D printing methods used for graphene nanocomposites include direct ink writing, selective laser sintering, stereolithography, fused deposition modeling and other approaches. Thermally stable poly(lactic acid)–graphene oxide nanocomposites have been processed using a direct ink printing technique. The 3D-printed poly(methyl methacrylate)–graphene have been printed using stereolithography and additive manufacturing techniques. The printed poly(methyl methacrylate)–graphene nanocomposites revealed enhanced morphological, mechanical and biological properties. The polyethylene–graphene nanocomposites processed by fused diffusion modeling have superior thermal conductivity, strength, modulus and radiation- shielding features. The poly(lactic acid)–graphene nanocomposites have been processed using a number of 3D printing approaches, including fused deposition modeling, stereolithography, etc., resulting in unique honeycomb morphology, high surface temperature, surface resistivity, glass transition temperature and linear thermal coefficient. The 4D printing has been applied on acrylonitrile-butadiene-styrene, poly(lactic acid) and thermosetting matrices with graphene nanofiller. Stereolithography-based 4D-printed polymer–graphene nanomaterials have revealed complex shape-changing nanostructures having high resolution. These materials have high temperature stability and high performance for technical applications. Consequently, the 3D- or 4D-printed polymer–graphene nanocomposites revealed technical applications in high temperature relevance, photovoltaics, sensing, energy storage and other technical fields. In short, this paper has reviewed the background of 3D and 4D printing, graphene-based nanocomposite fabrication using 3D–4D printing, development in printing technologies and applications of 3D–4D printing.

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Pleşa, Ilona, Petru Noţingher, Cristina Stancu, Frank Wiesbrock i Sandra Schlögl. "Polyethylene Nanocomposites for Power Cable Insulations". Polymers 11, nr 1 (24.12.2018): 24. http://dx.doi.org/10.3390/polym11010024.

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This review represents a comprehensive study of nanocomposites for power cables insulations based on thermoplastic polymers such as polyethylene congeners like LDPE, HDPE and XLPE, which is complemented by original results. Particular focus lies on the structure-property relationships of nanocomposites and the materials’ design with the corresponding electrical properties. The critical factors, which contribute to the degradation or improvement of the electrical performance of such cable insulations, are discussed in detail; in particular, properties such as electrical conductivity, relative permittivity, dielectric losses, partial discharges, space charge, electrical and water tree resistance behavior and electric breakdown of such nanocomposites based on thermoplastic polymers are described and referred to the composites’ structures. This review is motivated by the fact that the development of polymer nanocomposites for power cables insulation is based on understanding more closely the aging mechanisms and the behavior of nanocomposites under operating stresses.

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Bitenieks, Juris, Remo Merijs Meri, Janis Zicans i Krisjanis Buks. "Dynamic Mechanical, Dielectrical, and Rheological Analysis of Polyethylene Terephthalate/Carbon Nanotube Nanocomposites Prepared by Melt Processing". International Journal of Polymer Science 2020 (9.05.2020): 1–7. http://dx.doi.org/10.1155/2020/5715463.

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The polyethylene terephthalate/carbon nanotube (PET/CNT) nanocomposites were prepared by melt mixing using a twin screw extruder. CNT content was varied up to 5 wt. %. Morphology as well as dynamic mechanical, calorimetric, and rheological properties of the PET/CNT nanocomposites was investigated. Morphological studies indicated that CNT bundles are regularly distributed within the polymer matrix creating a connected network structure which significantly affects the nanocomposite properties. Dynamic mechanical thermal analysis revealed increase in storage and loss modules of the investigated PET nanocomposites by increasing the content of CNTs. Differential scanning calorimetry results demonstrated increase in crystallinity of the investigated PET nanocomposites upon addition of the nanofiller. Rheological studies demonstrated that CNT addition up to 5 wt. % caused increment in complex viscosity and storage modulus. Rheological percolation threshold was observed to be 0.83 wt. % of CNT concentration, respectively.

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Tuan, Vu Manh, Da Woon Jeong, Ho Joon Yoon, SangYong Kang, Nguyen Vu Giang, Thai Hoang, Tran Ich Thinh i Myung Yul Kim. "Using Rutile TiO2Nanoparticles Reinforcing High Density Polyethylene Resin". International Journal of Polymer Science 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/758351.

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The TiO2nanoparticles were used as a reinforcement to prepare nanocomposites with high density polyethylene (HDPE) by melt blending process. The original TiO2(ORT) was modified by 3-glycidoxypropyltrimethoxysilane (GPMS) to improve the dispersion into HDPE matrix. The FT-IR spectroscopy and FESEM micrographs of modified TiO2(GRT) demonstrated that GPMS successfully grafted with TiO2nanoparticles. The tensile test of HDPE/ORT and HDPE/GRT nanocomposites with various contents of dispersive particles indicated that the tensile strength and Young’s modulus of HDPE/GRT nanocomposites are superior to the values of original HDPE and HDPE/ORT nanocomposites. At 1 wt.% of GRT, the mechanical properties of nanocomposites were optimal. In DSC and TGA analyses, with the presence of GRT in the nanocomposites, the thermal stability significantly increased in comparison with pure HDPE and HDPE/ORT nanocomposites. The better dispersion of GRT in polymer matrix as shown in FESEM images demonstrated the higher mechanical properties of HDPE/GRT nanocomposites to HDPE/ORT nanocomposites.

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Guliyeva, T. M. "ZINC-CONTAINING NANOCOMPOSITES ON THE BASIS OF HIGH PRESSURE POLYETHYLENE". Azerbaijan Chemical Journal, nr 2 (18.06.2020): 34–38. http://dx.doi.org/10.32737/0005-2531-2020-2-34-38.

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Chang, Ming Kuen, Jia Ying Lin, Yan Huei Peng, Jian Jhih You i Yu Ming Wang. "A Study of Test for Polyethylene / Modified Montmorillonite Nanocomposites". Advanced Materials Research 194-196 (luty 2011): 1876–79. http://dx.doi.org/10.4028/www.scientific.net/amr.194-196.1876.

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This study have used three different montmorillonite by anionic, nonionic and ammonium chloride modifier to prepare polyethylene / montmorillonite (MMT) nanocomposites. The kneading process doped modified MMT to polyethylene, according with ASTM D638 to proceed hot-press works, and ASTM D256 to determine the izod pendulum impact resistance of plastics specimen. Prepared nanocomposites continue proceed in tensile and impact testing, finally, we observed low-density polyethylene layered silicate nanocomposites properties were improved, also found that anion modified montmorillonite had significant reinforcement effect in tensile and impact testing.

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Liu, Tian, Weston Wood, Bin Li, Brooks Lively i Wei-Hong Zhong. "Electrical and dielectric sensitivities to thermal processes in carbon nanofiber/high-density polyethylene composites". Science and Engineering of Composite Materials 18, nr 1-2 (1.06.2011): 51–60. http://dx.doi.org/10.1515/secm.2011.007.

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AbstractOwing to the huge interface region existing in a polymer nanocomposite, the effects of thermal processes on properties of nanocomposites are much more complicated than in a pure polymer. It is therefore important to determine the effects of thermal processes on nanocomposites with different interfacial interactions between the nanofillers and the polymer matrix. It is also important to explore the performance changes for nanocomposites under elevated temperatures over pure polymers. In this investigation, we examined the correlation of thermal treatment with dielectric properties of carbon nanofiber (CNF) reinforced high-density polyethylene nanocomposites. The thermal treatment of specimens was conducted for up to 120 h at 87°C and 127°C. Then, alternating current (AC) conductivity and dielectric properties were tested after definite intervals of time. Their changing rates over treatment time were analyzed. The results revealed the approximate linear relationships of AC conductivity and dielectric constant vs. heating time. Modified CNF reinforced nanocomposites had less influence by the heating treatments exhibiting better thermal resistance. The change rates of AC conductivity σ and dielectric properties have higher sensitivity to the treatment at a higher temperature. This study provides potential for further research on application of electrical and dielectric signals to detect the effects of heating process on lifetime of polymeric materials.

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36

Li, Shi Yun, i De Sheng Hu. "Polyethylene Functionalized Multi-Walled Carbon Nanotubes via In Situ Polymerization". Advanced Materials Research 573-574 (październik 2012): 1163–66. http://dx.doi.org/10.4028/www.scientific.net/amr.573-574.1163.

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The MWNTs/PE nanocomposites are prepared by in situ polymerization with mulltiwalled carbon nanotubes (MWNTs) supported Cp2ZrCl2 catalyst and MAO as cocatalyst. The SEM and AFM results show that MWNTs are exfoliated and homogenously dispersed in PE matrix by the in situ polymerization. The up-shifting of the G band in Raman spectra show the strong compressive forces associated with PE chains on the MWNTs. The storage modulus of the MWNTs/PE nanocomposite can be increased by 160% even at low amount of MWNTs (0.2 wt %) due to MWNTs well-dispersed and exfoliated in the matrix. The TGA and DMA tests point to significant improvements on thermal and mechanical properties of the PE/MWNTs nanocomposites compared to pure PE.

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Araújo, Edcleide Maria, Amanda D. de Oliveira, Renata Barbosa i Tomás Jefférson Alves de Mélo. "Influence of Organoclay on the Physical Properties of Polyethylene Nanocomposites". Materials Science Forum 530-531 (listopad 2006): 709–14. http://dx.doi.org/10.4028/www.scientific.net/msf.530-531.709.

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In this work, polyethylene/montmorillonite clay nanocomposites were produced by melt intercalation. The clays were treated with quaternary ammonium salts and then treated and untreated clays were introduced in polyethylene. The clays were characterized by X-Ray Diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FT-IR). The nanocomposites were characterized by mechanical and flammability properties. The results showed that the mechanical properties were improved by introduction of organoclay in polyethylene matrix. By adding only 3wt% montmorillonite, the burning rate of the nanocomposites was reduced by 17% in relation to PE matrix.

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Dirix, Yvo, Cyril Darribère, Wilbert Heffels, Cees Bastiaansen, Walter Caseri i Paul Smith. "Optically anisotropic polyethylene–gold nanocomposites". Applied Optics 38, nr 31 (1.11.1999): 6581. http://dx.doi.org/10.1364/ao.38.006581.

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Mohagheghian, I., G. J. McShane i W. J. Strongea. "Impact response of polyethylene nanocomposites". Procedia Engineering 10 (2011): 704–9. http://dx.doi.org/10.1016/j.proeng.2011.04.117.

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da Silva, Cristiane, Leonardo Canto i Leila Visconti. "Effect of Extrusion Processing Variables in the Polyethylene/Clay Nanocomposites Rheological Properties". Chemistry & Chemical Technology 4, nr 1 (20.03.2010): 61–68. http://dx.doi.org/10.23939/chcht04.01.061.

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Mariotti, Giulia, i Lorenzo Vannozzi. "Fabrication, Characterization, and Properties of Poly (Ethylene-Co-Vinyl Acetate) Composite Thin Films Doped with Piezoelectric Nanofillers". Nanomaterials 9, nr 8 (20.08.2019): 1182. http://dx.doi.org/10.3390/nano9081182.

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Ethylene vinyl acetate (EVA) is a copolymer comprehending the semi-crystalline polyethylene and amorphous vinyl acetate phases, which potentially allow the fabrication of tunable materials. This paper aims at describing the fabrication and characterization of nanocomposite thin films made of polyethylene vinyl acetate, at different polymer concentration and vinyl acetate content, doped with piezoelectric nanomaterials, namely zinc oxide and barium titanate. These membranes are prepared by solvent casting, achieving a thickness in the order of 100–200 µm. The nanocomposites are characterized in terms of morphological, mechanical, and chemical properties. Analysis of the nanocomposites shows the nanofillers to be homogeneously dispersed in EVA matrix at different vinyl acetate content. Their influence is also noted in the mechanical behavior of thin films, which elastic modulus ranged from about 2 to 25 MPa, while keeping an elongation break from 600% to 1500% and tensile strength from 2 up to 13 MPa. At the same time, doped nanocomposite materials increase their crystallinity degree than the bare ones. The radiopacity provided by the addition of the dopant agents is proven. Finally, the direct piezoelectricity of nanocomposites membranes is demonstrated, showing higher voltage outputs (up to 2.5 V) for stiffer doped matrices. These results show the potentialities provided by the addition of piezoelectric nanomaterials towards mechanical reinforcement of EVA-based matrices while introducing radiopaque properties and responsiveness to mechanical stimuli.

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Patel, Mitul, Daniel Schwendemann, Giorgia Spigno, Shiyu Geng, Linn Berglund i Kristiina Oksman. "Functional Nanocomposite Films of Poly(Lactic Acid) with Well-Dispersed Chitin Nanocrystals Achieved Using a Dispersing Agent and Liquid-Assisted Extrusion Process". Molecules 26, nr 15 (28.07.2021): 4557. http://dx.doi.org/10.3390/molecules26154557.

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The development of bio-based nanocomposites is of high scientific and industrial interest, since they offer excellent advantages in creating functional materials. However, dispersion and distribution of the nanomaterials inside the polymer matrix is a key challenge to achieve high-performance functional nanocomposites. In this context, for better dispersion, biobased triethyl citrate (TEC) as a dispersing agent in a liquid-assisted extrusion process was used to prepare the nanocomposites of poly (lactic acid) (PLA) and chitin nanocrystals (ChNCs). The aim was to identify the effect of the TEC content on the dispersion of ChNCs in the PLA matrix and the manufacturing of a functional nanocomposite. The nanocomposite film’s optical properties; microstructure; migration of the additive and nanocomposites’ thermal, mechanical and rheological properties, all influenced by the ChNC dispersion, were studied. The microscopy study confirmed that the dispersion of the ChNCs was improved with the increasing TEC content, and the best dispersion was found in the nanocomposite prepared with 15 wt% TEC. Additionally, the nanocomposite with the highest TEC content (15 wt%) resembled the mechanical properties of commonly used polymers like polyethylene and polypropylene. The addition of ChNCs in PLA-TEC15 enhanced the melt viscosity, as well as melt strength, of the polymer and demonstrated antibacterial activity.

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Azman, Hassan, Muhammad Imran, Mat Uzir Wahit i Harintharavimal Balakrishnan. "Recent Developments in PA6/PP Nanocomposites". Key Engineering Materials 471-472 (luty 2011): 7–19. http://dx.doi.org/10.4028/www.scientific.net/kem.471-472.7.

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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.

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Yang, Jiaming, Congji Liu, Changji Zheng, Hong Zhao, Xuan Wang i Mingze Gao. "Effects of Interfacial Charge on the DC Dielectric Properties of Nanocomposites". Journal of Nanomaterials 2016 (2016): 1–11. http://dx.doi.org/10.1155/2016/2935202.

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The interfacial charge phenomenon of MgO/low-density polyethylene (LDPE) and SiO2/LDPE nanocomposites was measured by synchrotron radiation small-angle X-ray scattering. Based on the Porod theory, the Porod curve of SiO2/LDPE nanocomposite shows negative divergence but the LDPE and MgO/LDPE do not, which reveals that interfacial charge may exist in the SiO2/LDPE nanocomposite. The DC dielectric properties of the nanocomposites are closely related to the interfacial charge. Experimental results show that the SiO2/LDPE nanocomposite has lower DC conductivity, less space charge, and higher DC breakdown strength than the MgO/LDPE nanocomposite. It is thought that the interfacial charge has a positive effect on the DC dielectric performance of nanocomposites, and the mechanism could be attributed to the scattering effects of the interfacial charge on the carrier migration. There is no obvious interfacial charge in the MgO/LDPE nanocomposite, but it still has excellent DC dielectric properties compared with LDPE, which indicates that the interfacial charge is not the only factor affecting the dielectric properties; the dipole interface layer and the reduction of free volume can also inhibit the migration of carriers and decrease electrons free path, improving the dielectric performance.

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Giannopoulos, Georgios I., i Stylianos K. Georgantzinos. "Thermomechanical Behavior of Bone-Shaped SWCNT/Polyethylene Nanocomposites via Molecular Dynamics". Materials 14, nr 9 (24.04.2021): 2192. http://dx.doi.org/10.3390/ma14092192.

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In the present study, the thermomechanical effects of adding a newly proposed nanoparticle within a polymer matrix such as polyethylene are being investigated. The nanoparticle is formed by a typical single-walled carbon nanotube (SWCNT) and two equivalent giant carbon fullerenes that are attached with the nanotube edges through covalent bonds. In this way, a bone-shaped nanofiber is developed that may offer enhanced thermomechanical characteristics when used as a polymer filler, due to each unique shape and chemical nature. The investigation is based on molecular dynamics simulations of the tensile stress–strain response of polymer nanocomposites under a variety of temperatures. The thermomechanical behavior of the bone-shaped nanofiber-reinforced polyethylene is compared with that of an equivalent nanocomposite filled with ordinary capped single-walled carbon nanotubes, in order to reach some coherent fundamental conclusions. The study focuses on the evaluation of some basic, temperature-dependent properties of the nanocomposite reinforced with these innovative bone-shaped allotropes of carbon.

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Zhang, Yong-Qi, Xuan Wang, Ping-Lan Yu i Wei-Feng Sun. "Water-Tree Resistant Characteristics of Crosslinker-Modified-SiO2/XLPE Nanocomposites". Materials 14, nr 6 (13.03.2021): 1398. http://dx.doi.org/10.3390/ma14061398.

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Trimethylolpropane triacrylate (TMPTA) as a photoactive crosslinker is grafted onto hydrophobic nanosilica surface through click chemical reactions of mercapto double bonds to prepare the functionalized nanoparticles (TMPTA-s-SiO2), which are used to develop TMPTA-s-SiO2/XLPE nanocomposites with improvements in mechanical strength and electrical resistance. The expedited aging experiments of water-tree growth are performed with a water-knife electrode and analyzed in consistence with the mechanical performances evaluated by means of dynamic thermo-mechanical analysis (DMA) and tensile stress–strain characteristics. Due to the dense cross-linking network of polyethylene molecular chains formed on the TMPTA-modified surfaces of SiO2 nanofillers, TMPTA-s-SiO2 nanofillers are chemically introduced into XLPE matrix to acquire higher crosslinking degree and connection strength in the amorphous regions between polyethylene lamellae, accounting for the higher water-tree resistance and ameliorated mechanical performances, compared with pure XLPE and neat-SiO2/XLPE nanocomposite. Hydrophilic TMPTA molecules grafted on the nano-SiO2 surface can inhibit the condensation of water molecules into water micro-beads at insulation defects, thus attenuating the damage of water micro-beads to polyethylene configurations under alternating electric fields and thus restricting water-tree growth in amorphous regions. The intensified interfaces between TMPTA-s-SiO2 nanofillers and XLPE matrix limit the segment motions of polyethylene molecular chains and resist the diffusion of water molecules in XLPE amorphous regions, which further contributes to the excellent water-tree resistance of TMPTA-s-SiO2/XLPE nanocomposites.

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López-García, S., Saul Sánchez-Valdés i L. F. Ramos de Valle. "Effect of Type and Concentration of Ionomer Compatibilizer on the Hdpe/ Ionomer/ Clay Nanocomposites Morphology". Materials Science Forum 644 (marzec 2010): 17–20. http://dx.doi.org/10.4028/www.scientific.net/msf.644.17.

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A study of the effect of an ionomer compatibilizer (surlyn® 9520 and 9721, both with zinc as the neutralizing cation) on the morphology and properties of a high density polyethylene (HDPE) - montmorillonite clay nanocomposite was carried out. The nanoclay used was cloisite 20A®. Polyethylene /Ionomer /Clay nanocomposites were prepared via melt mixing in a twin screw extruder. The nanoclay dispersion and exfoliation were examined through X-Ray Difraction (XRD) and Scanning Electron Microscopy (SEM). TGA was carried out to determine the effect of nanoclay on the thermal stability of the HDPE nanocomposites. Results showed that both ionomers impart a marked compatibility between the polymer and the nanoclay, promoting the exfoliation of the nanoclay within the HDPE matrix. Nonetheless, ionomer 9520 (with the higher degree of neutralization) at 10 and 12 wt% content produced completely exfoliated morphologies, whereas, the ionomer 9721 produced a lesser degree of exfoliation with few tactoids.

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48

Ragimova, S. K. "COPPER-CONTAINING NANOCOMPOSITES BASED ON ISOTACTIC POLYPROPYLENE AND HIGH PRESSURE POLYETHYLENE". Azerbaijan Chemical Journal, nr 3 (28.09.2021): 49–53. http://dx.doi.org/10.32737/0005-2531-2021-3-49-53.

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The effect of nanofilles additives containing copper oxide nanoparticles stabilized by a polymer matrix of high-pressure polyethylene obtained by the mechanochemical method on features of the structure and properties of metal-containing nanocomposites based on isotactic polypropylene and high-pressure polyethylene was studied using differential thermal (DTA) and X-ray phase (XRD) analyzes. The improvement of strength, deformation and rheological parameters, as well as thermal-oxidative stability of the obtained nanocomposites was revealed, that apparently, is associated with the synergistic effect of interfacial interaction of copper-containing nanoparticles in the PE matrix with the components of the PP/PE polymer composition

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Adewole, Jimoh K., Ibnelwaleed A. Hussein i Usamah A. Al-Mubaiyedh. "Development of a Mathematical Model for Natural Gas Permeation through Polymer Nanocomposites at High Pressure and Temperature". Journal of Nano Research 21 (grudzień 2012): 95–101. http://dx.doi.org/10.4028/www.scientific.net/jnanor.21.95.

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A mathematical model for predicting the permeability of natural gas in polymer nanocomposites was developed and tested using experimental data. The model takes into account the effects of pressure, temperature, crystallinity and nanoparticle loading. Three model parameters (, and) were obtained. The parameter is a measure of the activation energy, described the effect of nanocomposite loading, and can be used to describe the effect of gas concentration on the. Polymer nanocomposites were prepared using high density polyethylene as polymer matrix and Cloisite 15A as nanoclay. The proposed model was used to predict the permeability of the nanocomposites to pure CH4 and mixed CH4/CO2 gases (containing 80 mol% CH4) at pressures up to about 106 bar and temperatures between 30 to 70°C. Predicted results show that the developed model provides an excellent description of natural gas permeation in pure HDPE and its nanocomposites.

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Wang, Xu Man, i Cai Ning Zhang. "Preparation of Poly(γ-Glutamic Acid)/Montmorillonite Superabsorbent Nanocomposite". Key Engineering Materials 531-532 (grudzień 2012): 609–13. http://dx.doi.org/10.4028/www.scientific.net/kem.531-532.609.

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Montmorillonite (MMT) was applied as the modifying agent, polyethylene glycol bisglycidyl ether as crosslinking agent, Poly(γ-glutamic acid)/montmorillonite (γ-PGA/MMT) superabsorbent nanocomposite was prepared. The effects of crosslinking agent mass, MMT contents and reaction temperature on the saline water absorbency of the superabsorbent nanocomposites were studied. The experimental results demonstrated that the saline water absorbency of γ-PGA/MMT nanocomposites increased with the increasing of crosslinking agent mass firstly and decreased when the crosslinking agent mass was higher than 0.6g. The saline water absorbency of γ-PGA/MMT nanocomposites increased with the MMT contents up to 7% and decreased as the MMT contents further increased. Moreover, the saline water absorbency of γ-PGA/MMT nanocomposites increased with the reaction temperature firstly, and then decreased when the reaction temperature was higher than 50°C.

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