Готові списки джерел за темами / Nanoparticle- polymer Blend

Добірка наукової літератури з теми "Nanoparticle- polymer Blend"

Автор: Grafiati
Опубліковано: 6 вересня 2023

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Статті в журналах з теми "Nanoparticle- polymer Blend"

1

Zhang, Ren, Bongjoon Lee, Michael R. Bockstaller, Abdullah M. Al-Enizi, Ahmed Elzatahry, Brian C. Berry, and Alamgir Karim. "Soft-shear induced phase-separated nanoparticle string-structures in polymer thin films." Faraday Discussions 186 (2016): 31–43. http://dx.doi.org/10.1039/c5fd00141b.

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Application of shear stress has been shown to unidirectionally orient the microstructures of block copolymers and polymer blends. In the present work, we study the phase separation of a novel nanoparticle (NP)–polymer blend thin film system under shear using a soft-shear dynamic zone annealing (DZA-SS) method. The nanoparticles are densely grafted with polymer chains of chemically dissimilar composition from the matrix polymer, which induces phase separation upon thermal annealing into concentrated nanoparticle domains. We systematically examine the influence of DZA-SS translation speed and thus the effective shear rate on nanoparticle domain elongation and compare this with the counterpart binary polymer blend behavior. Unidirectionally aligned nanoparticle string-domains are fabricated in the presence of soft-shear in confined thin film geometry. We expect this DZA-SS method to be applicable to various NP–polymer blends towards unidirectionally aligned nanoparticle structures, which are important to functional nanoparticle structure fabrication.
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2

Ruiz de Luzuriaga, Alaitz, Hans Grande, and Jose A. Pomposo. "A Theoretical Investigation of Polymer-Nanoparticles as Miscibility Improvers in All-Polymer Nanocomposites." Journal of Nano Research 2 (August 2008): 105–14. http://dx.doi.org/10.4028/www.scientific.net/jnanor.2.105.

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The miscibility behaviour of polymer-nanoparticle / linear-polymer blends (all-polymer nanocomposites) has been investigated using an incompressible mean-field theoretical model that accounts for combinatorial, temperature-dependent exchange interaction energy and nanoparticle-driven effects. The theory is employed to predict the phase diagram of poly(styrene)-nanoparticle (PS-np) / linear-poly(vinyl methyl ether) (PVME) nanocomposites from room temperature to 675 K. Complete miscibility is predicted for PS-nanoparticles with radius < 6 nm blended with PVME (molecular weight 62 500 g/mol, nanoparticle volume fraction 20 %). The effect of PVME molecular weight and blend composition on the miscibility diagram is also addressed. When compared to the well-known experimental phase diagram of linear-PS / PVME blends displaying lower critical solution temperature (LCST) behaviour, the miscibility improving effect of sub-10 nm PS-nanoparticles is clearly highlighted. In terms of the model, this favourable nanoscale effect arises mainly from the reduced stretching induced by the sub-10 nm nanoparticles and the increased exothermic contacts when compared to nanoparticles with sizes > 10 nm.
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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.

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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.
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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.

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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.
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Meng, Lingyao, Hongyou Fan, J. Matthew D. Lane, and Yang Qin. "Bottom-Up Approaches for Precisely Nanostructuring Hybrid Organic/Inorganic Multi-Component Composites for Organic Photovoltaics." MRS Advances 5, no. 40-41 (2020): 2055–65. http://dx.doi.org/10.1557/adv.2020.196.

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Abstract:Achieving control over the morphology of conjugated polymer (CP) blends at nanoscale is crucial for enhancing their performances in diverse organic optoelectronic devices, including thin film transistors, photovoltaics, and light emitting diodes. However, the complex CP chemical structures and intramolecular interactions often make such control difficult to implement. We demonstrate here that cooperative combination of non-covalent interactions, including hydrogen bonding, coordination interactions, and π-π interactions, etc., can be used to effectively define the morphology of CP blend films, in particular being able to achieve accurate spatial arrangement of nanoparticles within CP nanostructures. Through UV-vis absorption spectroscopy and transmission electron microscopy, we show strong attachment of fullerene molecules, CdSe quantum dots, and iron oxide nanoparticles, onto well-defined CP nanofibers. The resulting core/shell hybrid nanofibers exhibit well-defined donor/acceptor interface when employed in photovoltaic devices, which also contributes to enhanced charge separation and transport. These findings provide a facile new methodology of improving CP/nanoparticle interfacial properties and controlling blend morphology. The generality of this methodology demonstrated in current studies points to a new way of designing hybrid materials based on organic polymers and inorganic nanoparticles towards applications in modern electronic devices.
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6

Guruswamy, B., V. Ravindrachary, C. Shruthi, and M. Mylarappa. "Effect of SnO2 Nanoparticle Doping on Structural, Morphological and Thermal Properties of PVA-PVP Polymer Blend." Materials Science Forum 962 (July 2019): 82–88. http://dx.doi.org/10.4028/www.scientific.net/msf.962.82.

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The n-type semiconductor SnO2 nanoparticles were synthesised using standard route and the effect of this nanoparticle doping on structural, morphological and thermal properties of PVA-PVP polymer blend has been investigated. Pure and PVA-PVP/SnO2 Nanocomposite films were prepared using solution casting technique. The powder X-ray diffraction result shows that the crystalline nature of the blend increases with doping level. FESEM study shows that the surface morphology of the polymer nanocomposite varies with doping level. AFM study reveals that in the nanocomposite films, the average roughness changes with dopant concentration. The DSC studies on the samples were performed from 40°C to 400°C under nitrogen atmosphere and it shows that the thermal properties of the blend changes with doping concentration.
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7

Riyajan, Sa-Ad, and Janthanipa Nuim. "Interaction of Green Polymer Blend of Modified Sodium Alginate and Carboxylmethyl Cellulose Encapsulation of Turmeric Extract." International Journal of Polymer Science 2013 (2013): 1–10. http://dx.doi.org/10.1155/2013/364253.

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Turmeric extract (tmr) loaded nanoparticles were prepared by crosslinking modified carboxylmethyl cellulose (CMC) and modified sodium alginate (SA) with calcium ions, in a high pressure homogenizer. The FTIR spectra of CMC and SA were affected by blending due to hydrogen bonding. The negative zeta potential increased in magnitude with CMC content. The smallest nanoparticles were produced with a 10 : 5 SA/CMC blend. Also the release rates of the extract loading were measured, with model fits indicating that the loading level affected the release rate through nanoparticle structure. The 10 : 5 SA/CMC blend loading with tmr and pure tmr showed a good % growth inhibition of colon cancer cells which indicate that tmr in the presence of curcumin in tmr retains its anticancer activity even after being loaded into SA/CMC blend matrix.
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Bergaliyeva, Saltanat, David L. Sales, José María Jiménez Cabello, Pedro Burgos Pintos, Natalia Fernández Delgado, Patricia Marzo Gago, Ann Zammit, and Sergio I. Molina. "Thermal and Mechanical Properties of Reprocessed Polylactide/Titanium Dioxide Nanocomposites for Material Extrusion Additive Manufacturing." Polymers 15, no. 16 (August 18, 2023): 3458. http://dx.doi.org/10.3390/polym15163458.

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Polylactic acid (PLA) is a biodegradable polymer that can replace petroleum-based polymers and is widely used in material extrusion additive manufacturing (AM). The reprocessing of PLA leads to a downcycling of its properties, so strategies are being sought to counteract this effect, such as blending with virgin material or creating nanocomposites. Thus, two sets of nanocomposites based respectively on virgin PLA and a blend of PLA and reprocessed PLA (rPLA) with the addition of 0, 3, and 7 wt% of titanium dioxide nanoparticles (TiO2) were created via a double screw extruder system. All blends were used for material extrusion for 3D printing directly from pellets without difficulty. Scanning electron micrographs of fractured samples’ surfaces indicate that the nanoparticles gathered in agglomerations in some blends, which were well dispersed in the polymer matrix. The thermal stability and degree of crystallinity for every set of nanocomposites have a rising tendency with increasing nanoparticle concentration. The glass transition and melting temperatures of PLA/TiO2 and PLA/rPLA/TiO2 do not differ much. Tensile testing showed that although reprocessed material implies a detriment to the mechanical properties, in the specimens with 7% nano-TiO2, this effect is counteracted, reaching values like those of virgin PLA.
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9

Bahtiar, Ayi, Siti Halimah Tusaddiah, Wendy Paramandhita S. Mustikasari, Lusi Safriani, Mariah Kartawidjaja, Kei Kanazawa, Ippei Enokida, Yukio Furukawa, and Isao Watanabe. "Optical, Structural and Morphological Properties of Ternary Thin Film Blend of P3HT:PCBM:ZnO Nanoparticles." Materials Science Forum 827 (August 2015): 119–24. http://dx.doi.org/10.4028/www.scientific.net/msf.827.119.

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Ternary blend film of conjugated polymer, fullerene and inorganic nanoparticles has intensively studied as active material for high power conversion efficiency (PCE) of hybrid organic-inorganic solar cells. The incorporation of two electron acceptor materials of organic fullerene and inorganic nanoparticles into hybrid with electron donor conjugated polymer is strongly believed can improve the PCE of solar cells by increasing exciton dissociation efficiency due to an increase of interface area between donor and acceptor materials where the positive and negative charges dissociated. We studied optical, structural and morphological properties of ternary thin film containing blend of conjugated polymer poly(3-hexylthiophene (P3HT):fullerene derivative PCBM:Zinc oxide nanoparticles (ZnO-NP) by measuring its optical absorption, crystal structure and film surface morphology. Zinc oxide nanoparticle was prepared by sol-gel method. It has optical absorption below 370 nm and average particle size 40 nm as shown by TEM picture. Ternary thin blend films of P3HT:PCBM:ZnO-NP were prepared by use of spin-coating method. The UV-Vis spectrum of thin film contains absorption peaks originated from contribution of P3HT at wavelengths 520 nm, 550 nm and 600 nm, from contribution of PCBM at 260 nm and 330 nm and from ZnO-NP at wavelengths below 370 nm which confirms that these three materials were well mixed in the films. Its XRD pattern also contains the peaks from each of these three-materials. In this report, we compare surface morphology of thin films of pure P3HT, pure ZnO-NP, blend of P3HT:PCBM, blend of P3HT:ZnO-NP and ternary blend of P3HT:PCBM:ZnO-NP.
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Pierini, Filippo, Massimiliano Lanzi, Paweł Nakielski, and Tomasz Aleksander Kowalewski. "Electrospun Polyaniline-Based Composite Nanofibers: Tuning the Electrical Conductivity by Tailoring the Structure of Thiol-Protected Metal Nanoparticles." Journal of Nanomaterials 2017 (2017): 1–10. http://dx.doi.org/10.1155/2017/6142140.

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Composite nanofibers made of a polyaniline-based polymer blend and different thiol-capped metal nanoparticles were prepared using ex situ synthesis and electrospinning technique. The effects of the nanoparticle composition and chemical structure on the electrical properties of the nanocomposites were investigated. This study confirmed that Brust’s procedure is an effective method for the synthesis of sub-10 nm silver, gold, and silver-gold alloy nanoparticles protected with different types of thiols. Electron microscopy results demonstrated that electrospinning is a valuable technique for the production of composite nanofibers with similar morphology and revealed that nanofillers are well-dispersed into the polymer matrix. X-ray diffraction tests proved the lack of a significant influence of the nanoparticle chemical structure on the polyaniline chain arrangement. However, the introduction of conductive nanofillers in the polymer matrix influences the charge transport noticeably improving electrical conductivity. The enhancement of electrical properties is mediated by the nanoparticle capping layer structure. The metal nanoparticle core composition is a key parameter, which exerted a significant influence on the conductivity of the nanocomposites. These results prove that the proposed method can be used to tune the electrical properties of nanocomposites.
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Більше джерел

Дисертації з теми "Nanoparticle- polymer Blend"

1

Zhang, Yue Zhang. "Phase Separation of Polymer-grafted Nanoparticle blend Thin Films." University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1494885057468539.

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2

Kalloudis, Michail. "Thin polymer films of block copolymers and blend/nanoparticle composites." Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/7894.

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In this thesis, atomic force microscopy (AFM), transmission electron microscopy (TEM) and optical microscopy techniques were used to investigate systematically the self-assembled nanostructure behaviour of two different types of spin-cast polymer thin films: poly(isoprene-b-ethylene oxide), PI-b-PEO diblock copolymers and [poly(9,9-dioctylfluorene-co-benzothiadiazole)]:poly[9,9- dioctyfluorene-co-N-(4-butylphenyl)-diphenylamine], F8BT:TFB conjugated polymer blends. In the particular case of the polymer blend thin films, the morphology of their composites with cadmium selenide (CdSe) quantum dot (QD) nanoparticles was also investigated. For the diblock copolymer thin films, the behaviour of the nanostructures formed and the wetting behaviour on mica, varying the volume fraction of the PEO block (fPEO) and the average film thickness was explored. For the polymer blend films, the effect of the F8BT/TFB blend ratio (per weight), spin-coating parameters and solution concentration on the phase-separated nanodomains was investigated. The influence of the quantum dots on the phase separation when these were embedded in the F8BT:TFB thin films was also examined. It was found that in the case of PI-b-PEO copolymer thin films, robust nanostructures, which remained unchanged after heating/annealing and/or ageing, were obtained immediately after spin coating on hydrophilic mica substrates from aqueous solutions. The competition and coupling of the PEO crystallisation and the phase separation between the PEO and PI blocks determined the ultimate morphology of the thin films. Due to the great biocompatible properties of the PEO block (protein resistance), robust PEO-based nanostructures find important applications in the development of micro/nano patterns for biological and biomedical applications. It was also found that sub-micrometre length-scale phase-separated domains were formed in F8BT:TFB spin cast thin films. The nanophase-separated domains of F8BT-rich and TFB-rich areas were close to one order of magnitude smaller (in the lateral direction) than those reported in the literature. When the quantum dot nanoparticles were added to the blend thin films, it was found that the QDs prefer to lie in the F8BT areas alone. Furthermore, adding quantum dots to the system, purer F8BT and TFB nano-phase separated domains were obtained. Conjugated polymer blend thin films are excellent candidates for alternatives to the inorganic semiconductor materials for use in applications such as light emitting diodes and photovoltaic cells, mainly due to the ease of processing, low-cost fabrication and mechanical flexibility. The rather limited optoelectronic efficiency of the organic thin films can be significantly improved by adding inorganic semiconducting nanoparticles.
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3

Simon, Daniel. "Multistability, Ionic Doping, and Charge Dynamics in Electrosynthesized Polypyrrole, Polymer-Nanoparticle Blend Nonvolatile Memory, and Fixed p-i-n Junction Polymer Light-Emitting Electrochemical Cells." Doctoral thesis, University of California, Santa Cruz, USA, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-94587.

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A variety of factors make semiconducting polymers a fascinating alternative for both device development and new areas of fundamental research. Among these are solution processability, low cost, flexibility, and the strong dependence of conduction on the presence of charge compensating ions. With the lack of a complete fundamental understanding of the materials, and the growing demand for novel solutions to semiconductor device design, research in the field can take many, often multifaceted, routes. Due to ion-mediated conduction and versatility of fabrication, conducting polymers can provide a route to the study of neural signaling. In the first of three research topics presented, junctions of polypyrrole electropolymerized on microelectrode arrays are demonstrated. Individual junctions, when synthesized in a three-electrode configuration, exhibit current switching behavior analogous to neural weighting. Junctions copolymerized with thiophene exhibit current rectification and the nonlinear current-voltage behavior requisite for complex neural systems. Applications to larger networks, and eventual use in analysis of signaling, are discussed. In the second research topic, nonvolatile resistive memory consisting of gold nanoparticles embedded in a polymer film is examined using admittance spectroscopy. The frequency dependence of the devices indicates space-charge-limited transport in the high-conductivity "on" state, and similar transport in the lower-conductivity "off" state. Furthermore, a larger dc capacitance of the on state indicates that a greater amount of filling of midgap trap levels introduced by the nanoparticles increases conductivity, leading to the memory effect. Implications on the question as to whether or not the on state is the result of percolation pathways is discussed. The third and final research topic is a presentation of enhanced efficiency of polymer light-emitting electrochemical cells (LECs) by means of forming a doping self-assembled monolayer (SAM) at the cathode-polymer interface. The addition of the SAM causes a twofold increase in quantum efficiency. Photovoltaic analysis indicates that the SAM increases both open-circuit voltage and short-circuit current. Current versus voltage data are presented which indicate that the SAM does not simply introduce an interfacial dipole layer, but rather provides a fixed doping region, and thus a more stable p-i-n structure.
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4

Simon, Daniel Theodore. "Multistability, ionic doping, and charge dynamics in electrosynthesized polypyrrole, polymer-nanoparticle blend nonvolatile memory, and fixed P-I-N junction polymer light-emitting electrochemical cells /." Diss., Digital Dissertations Database. Restricted to UC campuses, 2007. http://uclibs.org/PID/11984.

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5

Muangpil, Sairoong. "Functionalised polymers and nanoparticle/polymer blends." Thesis, University of Bristol, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.654111.

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The incorporation of nanoparticles into polydimethylsiloxane polymers either in the form of physical blending or chemical crosslinking has long been studied as it can improve the properties of composite materials. Interactions between the host polymer and the filler particle, filler concentration and conformation of each component are the key factors that influence these properties. Understanding the effect of these factors is of fundamental importance in all practical applications of composite materials. This thesis describes the study of a range of PDMS composites by using a variety of experimental techniques. The main techniques used were spin-spin (T2) relaxation and diffusion NMR spectroscopy, rheology and small-angle neutron scattering (SANS). The molecular mobility of a series of PDMS melts has been studied for both unentangled and entangled molecular weight regimes separated by the critical entanglement molecular weight (Mc) of the polymer. The experimental results revealed the effect of molecular weight and polydispersity of the polymers on their segmental mobility. The dramatic decrease of chain mobility observed at molecular weight above Mc was attributed to the effect of chain entanglements. The effect of nano-sized trimethylsilylated polysilicate resin (R2) on the chain mobility of PDMS in the form of physically blended was also examined. Two different concentrations (17 and 30 vol%) of R2 were incorporated into a wide range molecular weight of PDMS melts. Below Mc, the R2 particle was found to reinforce the PDMS at all particle loadings, whereas a plasticisation effect was observed for high molecular weight PDMS above Mc. This was attributed to a reduction of the degree of the entanglements when polymer chains adsorbed on particles. Chemically bonded composites of PDMS and polyhedral oligomeric silsesquioxane (POSS) were successfully synthesised via hydrosilylation. The length of the PDMS central block was found to affect both the size and the molecular mobility of the triblock polymers. The weight fraction of POSS and substituted groups on POSS were also seen to affect the molecular mobility. Finally, a series ofrandom crosslink polymer films ofPDMS and phenylsilsesquioxane (TPh) was studied by AFM, TEM, SAXS and SANS techniques to investigate the factors influencing the optical clarity of the samples. The degree of swelling and the segmental mobility of the sample films swollen in good and poor solvents were also studied.
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Ribeiro, Kairin Cristine. "OBTENÇÃO DE COMPOSTOS DE POLIPROPILENO COM PECTINA CÍTRICA." UNIVERSIDADE ESTADUAL DE PONTA GROSSA, 2014. http://tede2.uepg.br/jspui/handle/prefix/1458.

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Made available in DSpace on 2017-07-21T20:42:46Z (GMT). No. of bitstreams: 1 Kairin Ribeiro.pdf: 6162677 bytes, checksum: 0f20c9db1f4680a94411d055fb3f2d62 (MD5) Previous issue date: 2014-08-15
Conselho Nacional de Desenvolvimento Científico e Tecnológico
Researches based on the mixture of synthetic with natural polymers have intensified in recent times. The idea of using polysaccharides nano or micro level with polyolefins is the new of this work. Three compositions of polypropylene and commercial citrus pectin was prepared in proportions of 1, 3 and 5%. A coupling agent was used, the graphitized polypropylene with maleic anhydride to advance interaction between natural and synthetic particles. The obtaining of particles in nanometric scale pectin was made from colloid mill grinding. Some particles arrived near 100nm and majority the particles reached scales around 300nm. The structural analysis by X-ray diffraction and Fourier transform infrared spectroscopy demonstrated an interaction between maleic anhydride and pectin despite clusters of hydrophilic particles that were seen by scanning electron microscopy In the X-ray diffraction, the presence of crystals of sugars were detected. These crystals may have caramelized because processing temperatures are close to 200 C and were detected by colorimetry. Based on the mechanical data, it is possible realize that pectin had a plasticizing effect on the synthetic polymer, corroborating the rheological data and thermogravimetric tests, considering that the addition of higher amount of particles produces more thermal stability of the synthetic polymer.
Os estudos baseados na mistura de polímeros sintéticos com polímeros naturais têm se intensificado nos últimos tempos. A ideia de usar polissacarídeos em nano ou micro escala junto com poliolefinas é a novidade deste trabalho. Foram preparadas três composições de polipropileno e pectina cítrica comercial em proporções de 1, 3 e 5%. Foi utilizado um agente compatibilizante, o polipropileno grafitizado com anidrido maleico para favorecer a interação entre partículas naturais e as sintéticas. A obtenção de partículas em escala nanométricas de pectina foi feita partir de moagem em moinho coloidal e chegou próxima da faixa de 100nm, pois as partículas atingiram escalas em torno de 300nm. A análise estrutural feita por infravermelho e difração de raios-X demonstrou que houve interação entre o anidrido maleico e a pectina apesar dos aglomerados de partículas hidrofílicas que foram percebidos através da microscopia eletrônica de varredura. Também a partir dos dados de difração de raios-X, a presença de cristais de açúcares foram detectados, que por colorimetria podem ter se caralemizado devido temperaturas de processamento estarem próximas de 200ºC. A partir dos dados mecânicos, é possível perceber que a pectina teve um efeito plastificante no polímero sintético, corroborando com dados reológicos e com os testes termogravimétricos, considerando que quanto maior adição de partículas, maior a estabilidade térmica do polímero sintético.
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Vlerken, Lilian Emilia van. "Modulation of multidrug resistance in cancer using polymer-blend nanoparticles : thesis /." Diss., View dissertation online, 2008. http://hdl.handle.net/2047/d10017355.

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8

Cheerarot, Onanong. "The effects of nanoparticles on structure development in immiscible polymer blends." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/the-effects-of-nanoparticles-on-structure-development-in-immiscible-polymer-blends(cca9d075-dfcd-46c5-b865-290c414b4315).html.

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Composites based on binary polymer blends of polystyrene (PS)/poly(ethylene-co-vinyl alcohol) (EVOH) (70/30 wt%) containing natural Montmorillonite, Na-MMTs (Nanomer PGW or Cloisite Na+) and organically modified Montmorillonite clays, OMMTs (Nanomer I.30T, Cloisite 30B or Cloisite 10A) were prepared via melt compounding. The interactions between the polymers and clays were studied using flow micro-calorimetry (FMC). Data obtained from FMC indicated that the probe molecule mimicking EVOH (butan-2-ol) interacted with the MMTs and OMMTs much more strongly than PS. Scanning electron microscopy (SEM) revealed that composites based on binary blends had dispersed/continuous morphologies, in which EVOH was dispersed in a PS matrix. The size of the EVOH droplets in the PS matrix increased with increasing clay loading. Transmission electron microscopy (TEM) and wide angle X-ray diffraction (WAXD) were used to determine the extent of dispersion and location of clay in the PS/EVOH/clay composites. These techniques confirmed the formation of intercalated clay structures. As predicted by FMC, the clay platelets were selectively located in the EVOH phase, independent of the blending sequence and the type of organic modifier in the OMMT. Composites containing OMMTs showed better dispersion of platelets within the EVOH phase than those containing Na-MMTs. Differential scanning calorimetry (DSC); showed the crystallisation behaviour of EVOH to depend on the clay loading and the nature of the organic modifier in the OMMT. Nanomer PGW, Cloisite Na+ and Cloisite 30B acted as weak nucleating agents. In contrast, Nanomer I.30T and Cloisite 10A significantly hindered the crystallisation of EVOH in the blends due to the restriction of chain segment mobility. Dynamic mechanical thermal analysis (DMTA) confirmed that the presence of clay increases the storage modulus of the composites compared to an unfilled blend. In addition, the improvement in storage modulus reflected the dispersion state of the different clays and their interaction with the polymers of the blend. Ternary-blend based composites were formed by adding poly(styrene-co-acrylonitrile) (SAN) to the composites based on binary PS/EVOH blends. This resulted in a finer dispersion of the EVOH phase and the development of a core-shell morphology, in which SAN encapsulated and formed shells around EVOH droplets. In contrast to binary blend composites, the clay platelets were found at the interface between SAN and EVOH in the ternary blends.
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9

Paul, Rituparna. "Stability and Morphological Evolution in Polymer/Nanoparticle Bilayers and Blends Confined to Thin Film Geometries." Diss., Virginia Tech, 2007. http://hdl.handle.net/10919/28747.

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Thin film bilayers and blends composed of polymers and nanoparticles are increasingly important for technological applications that range from space survivable coatings to novel drug delivery systems. Dewetting or spontaneous hole formation in amorphous polymer films and phase separation in multicomponent polymer films can hinder the stability of these systems at elevated temperatures. Hence, fundamental understanding of dewetting and phase separation in polymer/nanoparticle bilayer and blend films is crucial for controlling transport and thermomechanical properties and surface morphologies of these systems. This dissertation provides studies on morphological evolution driven by phase separation and/or dewetting in model polymer/nanoparticle thin film bilayers and blends at elevated temperatures. Morphological evolution in dewetting bilayers of poly(t-butyl acrylate) (PtBA) or polystyrene (PS) and a polyhedral oligomeric silsesquioxane (POSS), trisilanolphenyl-POSS (TPP) is explored at elevated temperatures. The results demonstrate unique dewetting morphologies in both PtBA/TPP and PS/TPP bilayers that are significantly different from those typically observed in dewetting polymer/polymer bilayers. Upon annealing the PtBA/TPP bilayers at 95°C, a two-step dewetting process is observed. PtBA immediately diffuses into the upper TPP layer leading to hole formation and subsequently the holes merge to form interconnected rim structures in the upper TPP layer. Dewetting of both the TPP and PtBA layers at longer annealing times leads to the evolution of scattered holes containing TPP-rich, fractal aggregates. The fractal dimensions of the TPP-rich, fractal aggregates are ~2.2 suggesting fractal pattern formation via cluster-cluster aggregation. Dewetting in PS/TPP bilayers also proceeds via a two-step process; however, the observed dewetting morphologies are dramatically different from those observed in PtBA/TPP bilayers. Cracks immediately form in the upper TPP layer during annealing of PS/TPP bilayers at 200°C. With increasing annealing times, the cracks in the TPP layer act as nucleation sites for dewetting and aggregation of the TPP layer and subsequent dewetting of the underlying PS layer. Complete dewetting of both the TPP and PS layers results in the formation of TPP encapsulated PS droplets. Phase separation in PtBA/TPP thin film blends is investigated as functions of annealing temperature and time. The PtBA/TPP thin film blend system exhibits an upper critical solution temperature (LCST) phase diagram with a critical composition and temperature of 60 wt% PtBA and ~70°C, respectively. Spinodal decomposition (SD) is observed for 60 wt% PtBA blend films and off-critical SD is seen for 58 and 62 wt% PtBA blend films. The temporal evolution of SD in 60 wt% PtBA blend films is also explored. Power law scaling for the characteristic wavevector with time (q ~ t^n with n = -1/4 to -1/3) during the early stages of phase separation yields to domain pinning at the later stages for films annealed at 75, 85, and 95°C. In contrast, domain growth is instantly pinned for films annealed at 105°C. Our work provides an important first step towards understanding how nanoparticles affect polymer thin film stability and this knowledge may be utilized to fabricate surfaces with tunable morphologies via controlled dewetting and/or phase separation.
Ph. D.
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Parpaite, Thibault. "Synthèse de nanoparticules hybrides asymétriques et étude de leur effet compatibilisant dans des mélanges de polymères." Thesis, Montpellier 2, 2014. http://www.theses.fr/2014MON20103/document.

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Les matériaux polymères appelés communément "Plastiques" sont très présents dans notre vie quotidienne. Leurs propriétés intrinsèques nécessitent souvent d'être améliorées pour répondre aux normes et autres cahiers des charges régissant leur utilisation. Ainsi, deux grandes stratégies sont aujourd'hui utilisées. La première consiste à incorporer des renforts (exemple de la fibre de verre) pour augmenter certaines propriétés mécaniques. La seconde consiste à mélanger deux polymères distincts possédant chacun des caractéristiques spécifiques pour obtenir un matériau combinant les propriétés des deux polymères de base, Il s'agit alors de "compatibilisation". L'objectif de ce travail de thèse est de fabriquer des nanoparticules capables de combiner les notions de renfort et de compatibilisation précédemment évoquées. Pour ce faire, une stratégie de synthèse en miniémulsion reposant sur un phénomène de séparation interne de phase a permis de produire des nanoparticules hybrides asymétriques. Ces dernières sont formées d'un cœur de silice d'environ 50 nanomètres de diamètre dont l'un des hémisphères seulement a été greffé par des chaînes de polystyrène (PS) formant un nodule d'environ 80 nanomètres de diamètre. Ces nanoparticules asymétriques silice/PS ont ensuite été introduites dans un mélange de polystyrène et de polyamide-6 (PS/PA6). La migration des nanoparticules silice/PS à l'interface de ce mélange a été vérifiée par microscopie électronique à balayage (MEB). Les phénomènes mis en jeu dans cette migration ont été étudiés de façon approfondie via une étude modèle. Des nanocomposites PS/PA6 comportant différents taux de charges de nanoparticules asymétriques ont été réalisés pour vérifier l'effet compatibilisant de ces dernières. Ainsi, une nette diminution des tailles des phases dispersées de PA6 a pu être mise en évidence par MEB et par granulométrie à diffraction laser correspondant à un effet émulsifiant. Enfin, des essais rhéologiques à l'état fondu qui finalisent cette étude et ont permis de montrer via l'utilisation d'un modèle de Palierne ajusté, une diminution de la tension interfaciale apparente du mélange liée au taux de charges en nanoparticules silice/PS
Polymers materials usually named « plastics » are widely present in our daily life. Their intrinsic properties often need to be improved in order to respect regulations, standards and others specifications governing their commercial use. Thus, two main strategies are used. The first one consists in incorporating solid fillers to improve some mechanical properties. The second one is based on the mixing of two polymers with specific characteristics to obtain a new material combining the properties of the two initial polymers used. The main goal of this work is to synthesize nanoparticles able to combine the both strategies presented before. To do this, a protocol of synthesis by miniemulsion based on an intern phase separation process was employed and hybrid asymmetric nanoparticles were obtained. These hybrid asymmetric nanoparticles correspond to a silica core (around 50 nanometers diameter) with only one hemisphere grafted by polystyrene (PS) chains resulting in a PS nodule (around 80 nanometers diameter). Then, these asymmetric silica/PS nanoparticles were incorporated into a polystyrene/polyamide-6 (PS/PA6) blend and their migration to the matrix/nodule interface was highlighted by scanning electron microscope (SEM). Experimental and theoretical investigations were focus on the phenomena involved in this migration. To evaluate the compatibilizing effect of silica/PS nanoparticles, several PS/PA6 nanocomposites with various contents of nanoparticles were prepared. A significant decrease of PA6 nodules size as function of nanoparticles concentration was observed by SEM and diffraction particle size analyzer which prove an emulsifying effect for silica/PS nanoparticles. Finally, the rheological tests at the melted state combined with an adjusted Palierne model method, show a decrease of the apparent interfacial tension of the blend as function of the silica/PS nanoparticles content
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Книги з теми "Nanoparticle- polymer Blend"

1

Alkhodairi, Husam. Compatibilization of Immiscible Polymer Blends Using Polymer-Grafted Nanoparticles. [New York, N.Y.?]: [publisher not identified], 2022.

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Частини книг з теми "Nanoparticle- polymer Blend"

1

Huang, Chongwen, and Wei Yu. "Rheology And Processing of Nanoparticle Filled Polymer Blend Nanocomposites." In Rheology and Processing of Polymer Nanocomposites, 491–550. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781118969809.ch15.

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Paul, D. R., and R. R. Tiwari. "Polymer Blends Containing “Nanoparticles”." In Polymer Blends Handbook, 1485–557. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-007-6064-6_20.

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Ginzburg, Valeriy V. "Nanoparticle/Polymer Blends: Theory and Modeling." In Encyclopedia of Polymer Blends, 233–68. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2016. http://dx.doi.org/10.1002/9783527805204.ch7.

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Zhang, M. Q., M. Z. Rong, and W. H. Ruan. "Nanoparticles/Polymer Composites: Fabrication and Mechanical Properties." In Nano- and Micromechanics of Polymer Blends and Composites, 91–140. München: Carl Hanser Verlag GmbH & Co. KG, 2009. http://dx.doi.org/10.3139/9783446430129.003.

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Kalfus, J. "Viscoelasticity of Amorphous Polymer Nanocomposites with Individual Nanoparticles." In Nano- and Micromechanics of Polymer Blends and Composites, 207–40. München: Carl Hanser Verlag GmbH & Co. KG, 2009. http://dx.doi.org/10.3139/9783446430129.006.

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Mark, J. E., T. Z. Sen, and A. Kloczkowski. "Some Monte Carlo Simulations on Nanoparticle Reinforcement of Elastomers." In Nano- and Micromechanics of Polymer Blends and Composites, 517–44. München: Carl Hanser Verlag GmbH & Co. KG, 2009. http://dx.doi.org/10.3139/9783446430129.014.

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Abraham, Jiji, Lakshmipriya Somasekharan, Sharika T., Lakshmi R. Pillai, Hanna J. Maria, and Sabu Thomas. "Elastomer Blends: The Role of Nanoparticles on Properties." In Encyclopedia of Polymeric Nanomaterials, 1–9. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-36199-9_290-1.

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Abraham, Jiji, Lakshmipriya Somasekharan, T. Sharika, Lakshmi R. Pillai, Hanna J. Maria, and Sabu Thomas. "Elastomer Blends: The Role of Nanoparticles on Properties." In Encyclopedia of Polymeric Nanomaterials, 660–66. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-642-29648-2_290.

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9

Salehiyan, Reza, and Suprakas Sinha Ray. "Processing of Polymer Blends, Emphasizing: Melt Compounding; Influence of Nanoparticles on Blend Morphology and Rheology; Reactive Processing in Ternary Systems; Morphology–Property Relationships; Performance and Application Challenges; and Opportunities and Future Trends." In Processing of Polymer-based Nanocomposites, 167–97. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-97792-8_6.

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Komatsu, Luiz Gustavo Hiroki, Angelica Tamiao Zafalon, Vinicius Juvino Santos, Nilton Lincopan, Vijaya Kumar Rangari, and D. F. Parra. "Application of Natural Nanoparticles in Polymeric Blend of HMSPP/SEBS for Biocide Activity." In Green Materials Engineering, 79–87. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-10383-5_9.

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Тези доповідей конференцій з теми "Nanoparticle- polymer Blend"

1

Breeze, Alison J., Zack Schlesinger, Sue A. Carter, Hans-Heinrich Hoerhold, Hartwig Tillmann, David S. Ginley, and Phillip J. Brock. "Nanoparticle-polymer and polymer-polymer blend composite photovoltaics." In International Symposium on Optical Science and Technology, edited by Zakya H. Kafafi. SPIE, 2001. http://dx.doi.org/10.1117/12.416932.

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2

Mallick, Shoaib, Zubair Ahmad, and Farid Touati. "Polymer Nanocomposite-based Moisture Sensors for Monitoring of the Water Contents in the Natural Gas Pipelines." In Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2020. http://dx.doi.org/10.29117/quarfe.2020.0073.

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In this study, the polymer-based humidity sensors were investigated for humidity sensing applications. The key advantages of polymers that have garnered this attraction are their lightweight, easy preparation, and low cost of both materials and fabrication process. Different techniques are used to enhance the surface morphology and sensitivity of polymeric films, which include synthesis of nanocomposites, copolymerization techniques, and blending of polymers. The incorporation of nanoparticles to the polymer matrix improves the electrical and mechanical properties of the polymeric film. We have investigated different polymer nanocomposites based humidity sensors on enhancing the sensitivity of the sensor, on achieving faster response and recovery time and lower hysteresis loss as compared to the polymeric humidity sensors. In the first phase, we investigated the PLA-TiO2 nanocomposite for humidity sensing applications. We have optimized the concentration of TiO2 in the PLA-TiO2 nanocomposite and apply acetone for the surface treatment of the sensing film. In the second phase, we studied the PVDF-TiO2 nanocomposite-based humidity sensor, achieved a linear response of the sensor, and optimized the concentration of PVDF. In the third phase, we incorporated the BaTiO3 nanoparticles within optimized PVDF and studied the dielectric property of the nanocomposite film. PVDF-BaTiO3 sensors show a smaller hysteresis response. In the 4th phase, we blend the PVDF with SPEEK polymer; the optimized concentration of SPEEK improves the sensitivity of the humidity sensors at a lower humidity level.
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Holzworth, Kristin, Gregory Williams, Bedri Arman, Zhibin Guan, Gaurav Arya, and Sia Nemat-Nasser. "Polyurea With Hybrid Polymer Grafted Nanoparticles: A Parametric Study." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-88395.

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The basis of this research is to mitigate shock through material design. In this work, we seek to develop an understanding of parametric variations in polyurea-based nano-composite materials through experimental characterization and computational modeling. Blast-mitigating applications often utilize polyurea due to its excellent thermo-mechanical properties. Polyurea is a microphase-separated segmented block copolymer formed by the rapid reaction of an isocyanate component and an amine component. Block copolymers exhibit unique properties as a result of their phase-separated morphology, which restricts dissimilar block components to microscopic length scales. The soft segments form a continuous matrix reinforced by the hard segments that are randomly dispersed as microdomains. The physical properties of the separate phases influence the overall properties of the polyurea. While polyurea offers a useful starting point, control over crystallite size and morphology is limited. For compositing, the blending approach allows superb control of particle size, shape, and density; however, the hard/soft interface is typically weak for simple blends. Here, we overcome this issue by developing hybrid polymer grafted nanoparticles, which have adjustable exposed functionality to control both their spatial distribution and interface. These nano-particles have tethered polymer chains that can interact with their surrounding environment and provide a method to control well defined and enhanced nano-composites. This approach allows us to adjust a number of variables related to the hybrid polymer grafted nanoparticles including: core size and shape, core material, polymer chain length, polymer chain density, and monomer type. In this work, we embark on a parametric study focusing on the effect of silica nanoparticle size, polymer chain length, and polymer chain density. Preliminary results from experimental characterization and computational modeling indicate that the dynamic mechanical properties of the material can be significantly altered through such parametric modifications. These efforts are part of an ongoing initiative to develop elastomeric composites with optimally designed compositions and characteristics to manage blast-induced stress-wave energy.
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Pawlik, Bosćij, Christian Schirrmann, Kirstin Bornhorst, and Florenta Costache. "Strain-enhanced nanoparticle electrostrictive polymer blends for actuator applications." In SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, edited by Yoseph Bar-Cohen. SPIE, 2013. http://dx.doi.org/10.1117/12.2011715.

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de Luna, Martina Salzano, Andrea Causa, Domenico Acierno, and Giovanni Filippone. "Melt state dynamics of plate-like nanoparticles in immiscible polymer blends." In TIMES OF POLYMERS (TOP) AND COMPOSITES 2014: Proceedings of the 7th International Conference on Times of Polymers (TOP) and Composites. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4876833.

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Altobelli, Rosaria, Martina Salzano de Luna, Andrea Causa, Domenico Acierno, and Giovanni Filippone. "Morphology stabilization of co-continuous polymer blends through clay nanoparticles." In VIII INTERNATIONAL CONFERENCE ON “TIMES OF POLYMERS AND COMPOSITES”: From Aerospace to Nanotechnology. Author(s), 2016. http://dx.doi.org/10.1063/1.4949632.

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Kilic, Nilay Tuccar, Buse Nur Can, Mehmet Kodal, and Guralp Ozkoc. "Effects of epoxy-POSS nanoparticles on the properties of PLA/TPU blends." In PROCEEDINGS OF PPS-32: The 32nd International Conference of the Polymer Processing Society - Conference Papers. Author(s), 2017. http://dx.doi.org/10.1063/1.5016732.

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Filippone, G., D. Acierno, A. D’Amore, Domenico Acierno, and Luigi Grassia. "Impact of Nanoparticles on the Microstructure and Properties of Immiscible Polymer Blends: Preliminary Investigations." In V INTERNATIONAL CONFERENCE ON TIMES OF POLYMERS (TOP) AND COMPOSITES. AIP, 2010. http://dx.doi.org/10.1063/1.3455574.

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Takei, Satoshi. "Light-scattering thermal cross-linking material using morphology of nanoparticle free polymer blends." In SPIE Advanced Lithography, edited by Thomas I. Wallow and Christoph K. Hohle. SPIE, 2015. http://dx.doi.org/10.1117/12.2081825.

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Shady, K. E., M. N. Michael, and H. A. Shimaa. "Effects of zinc oxide nanoparticles on the performance characteristics of cotton, polyester and their blends." In 6TH INTERNATIONAL CONFERENCE ON TIMES OF POLYMERS (TOP) AND COMPOSITES. AIP, 2012. http://dx.doi.org/10.1063/1.4738495.

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