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Автор: Grafiati
Опубліковано: 7 вересня 2023

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Статті в журналах з теми "Nanocomposites - Physical Properties"

1

Abou El Fadl, Faten Ismail, Maysa A. Mohamed, Magida Mamdouh Mahmoud, and Sayeda M. Ibrahim. "Studying the electrical conductivity and mechanical properties of irradiated natural rubber latex/magnetite nanocomposite." Radiochimica Acta 110, no. 2 (November 22, 2021): 133–44. http://dx.doi.org/10.1515/ract-2021-1080.

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Abstract Nanocomposites have received voluminous interest due to the combination of unique properties of organic and inorganic component in one material. In this class, magnetic polymer nanocomposites are of particular interest because of the combination of excellent magnetic properties, stability, and good biocompatibility. This paper reports the preparation and characterization of nanocomposites films based on natural rubber in latex state (NRL) loaded with different concentrations of semiconducting magnetite nanoparticles (Fe3O4) (MNPs) (5, 10, 15, 20, and 30%). NRL (100%) and NRL/Fe3O4 nanocomposites were prepared by solution casting technique then, exposed to various irradiation doses (50, 70, 100 kGy).The nanocomposite’s morphological, and physical properties were investigated through various spectroscopic techniques such as Fourier-transformed infrared, X-ray diffraction, scanning electron, and transmission electron microscopies. The mechanical properties, including the tensile strength and elongation at break percentage (E b %) of the nanocomposites were also studied and compared with the 100% NRL films. Based on the results obtained from the mechanical study, it is found that the NRL/20% Fe3O4 nanocomposite film exhibited the highest tensile strength at 100 kGy. On the other hand, based on the conductivity study, it is found that, NRL/Fe3O4 nanocomposite with 10% magnetite exhibit the highest conductivity as the content of magnetite plays an important and effective role based on the high and homogeneous dispersity.
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2

Alakrach, Abdulkader M., Awad A. Al-Rashdi, Mohamed Khalid Al-Omar, Taha M. Jassam, Sam Sung Ting, Omar S. Dahham, and Nik Noriman Zulkepli. "Physical and Barrier Properties of Polylactic Acid/Halloysite Nanotubes-Titanium Dioxide Nanocomposites." Materials Science Forum 1021 (February 2021): 280–89. http://dx.doi.org/10.4028/www.scientific.net/msf.1021.280.

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In this study, PLA/TiO2 and PLA/HNTs-TiO2 nanocomposites films were fabricated via solution casting method. By testing the film density, solubility, water contact angle and water vapor permeability, the PLA nanocomposite films, the comprehensive performances of the nanocomposites were analysed. The outcomes demonstrated that maximum film density of PLA/TiO2 and PLA/HNTs-TiO2 nanocomposites films increased gradually with the increasing of nanofiller loadings. Moreover, the incorporation of TiO2 and HNTs-TiO2 significantly decreased the water vapor transmittance rate of the nanocomposite films with a slight priority to the addition of HNTs-TiO2, the water solubility was significantly improved with the addition of both nanofillers. Furthermore, the barrier properties were developed with the addition of both TiO2 and HNTs-TiO2 especially after the addition of low nanofiller loadings. Overall, the performance of the PLA/HNTs-TiO2 nanocomposite films was better than that PLA/TiO2 film. Nevertheless, both of the PLA nanocomposite samples achieved the requests of food packaging applications.
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3

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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Allahverdiyeva, Kh V. "PHYSICAL-MECHANICAL PROPERTIES OF NANOCOMPOSITES BASED ON GRAPHITE AND MODIFIED POLYOLEFINS." Chemical Problems 19, no. 4 (2021): 232–40. http://dx.doi.org/10.32737/2221-8688-2021-4-232-240.

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The influence of the graphite concentration on the main physical-mechanical properties of nanocomposites based on such polyolefin as high density polyethylene, low density polyethylene and polypropylene is considered. Properties such as tensile yield stress, ultimate tensile stress, and ultimate bending strength, elongation at break, heat resistance, flexural strength, MFI, and melting points are analysed. To improve the compatibility of the mixed components of the mixture, we used an Exxelor PO1040 compatibilizer for all grades of polyethylene and Exxelor PO1020 for polypropylene. Graphite was introduced into the composition of polyolefin at the following concentrations: 1.0, 3.0, 5.0, 10, 15, 20, and 30 wt%. As a result of the research, it was found that the introduction of graphite into the composition of polyolefin was accompanied by an improvement in strength characteristics with maximum at various concentrations. For high density polyethylene, the maximum values of strength characteristics are observed at 3.0 wt%, for low density polyethylene at 10 wt%, and for polypropylene at 5.0 wt% content of graphite. It revealed that such a difference in the value of the threshold concentration of graphite which provides the maximum value of strength indicators,was directly related to the degree of crystallinity of the polymer matrix.
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Tushavina, O. V., G. I. Kriven, and Thant Zin Hein. "Study of Thermophysical Properties of Polymer Materials Enhanced by Nanosized Particles." International Journal of Circuits, Systems and Signal Processing 15 (September 14, 2021): 1436–42. http://dx.doi.org/10.46300/9106.2021.15.155.

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In this work, the object of study is an epoxy nanocomposite based on TiO2 nanoparticles and epoxy resin, and the subject is the preparation and physical and mechanical properties of TiO2/epoxy nanocomposites. The characteristics of the properties and methods of synthesis of the initial components for the synthesis of epoxy nanocomposites - epoxy resins and nanoparticles of titanium dioxide are given, and data on epoxy nanocomposites based on nanoparticles of titanium dioxide are presented. It was found that the addition of TiO2 to the epoxy matrix reduces the coefficient of friction and significantly increases the wear resistance of such nanocomposites.
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6

Kumar, Amit, Pen-Yi Hsieh, Muhammad Omar Shaikh, R. K. Rakesh Kumar, and Cheng-Hsin Chuang. "Flexible Temperature Sensor Utilizing MWCNT Doped PEG-PU Copolymer Nanocomposites." Micromachines 13, no. 2 (January 27, 2022): 197. http://dx.doi.org/10.3390/mi13020197.

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In this study, polyethylene glycol (PEG) and polyurethane (PU)-based shape-stabilized copolymer nanocomposites were synthesized and utilized for developing low-cost and flexible temperature sensors. PU was utilized as a flexible structural material for loading a thermosensitive phase change PEG polymer by means of physical mixing and chemical crosslinking. Furthermore, the introduction of multi-walled carbon nanotubes (MWCNT) as a conductive filler in the PEG-PU copolymer resulted in a nanocomposite with thermoresistive properties. MWCNT loading concentrations from 2 wt.% to 10 wt.% were investigated, to attain the optimum conductivity of the nanocomposite. Additionally, the effect of MWCNT loading concentration on the thermosensitive behavior of the nanocomposite was analyzed in the temperature range 25 °C to 50 °C. The thermosensitive properties of the physically mixed and crosslinked polymeric nanocomposites were compared by spin coating the respective nanocomposites on screen printed interdigitated (IDT) electrodes, to fabricate the temperature sensor. The chemically crosslinked MWCNT-PEG-PU polymeric nanocomposite showed an improved thermosensitive behavior in the range 25 °C to 50 °C, compared to the physically mixed nanocomposite. The detailed structural, morphological, thermal, and phase transition properties of the nanocomposites were investigated using XRD, FTIR, and DSC analysis. XRD and FTIR were used to analyze the crystallinity and PEG-PU bonding of the copolymer nanocomposite, respectively; while the dual phase (solid–liquid) transition of PEG was analyzed using DSC. The proposed nanocomposite-based flexible temperature sensor demonstrated excellent sensitivity, reliability and shows promise for a wide range of bio-robotic and healthcare applications.
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Yu, Suzhu, Yang Kang Juay, and Ming Shyan Young. "Fabrication and Characterization of Carbon Nanotube Reinforced Poly(methyl methacrylate) Nanocomposites." Journal of Nanoscience and Nanotechnology 8, no. 4 (April 1, 2008): 1852–57. http://dx.doi.org/10.1166/jnn.2008.18250.

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Анотація:
Multiwall carbon nanotube (CNT) reinforced poly(methyl methacrylate) (PMMA) nanocomposites have been successfully fabricated with melt blending. Two melt blending approaches of batch mixing and continuous extrusion have been used and the properties of the derived nanocomposites have been compared. The interaction of PMMA and CNTs, which is crucial to greatly improve the polymer properties, has been physically enhanced by adding a third party of poly(vinylidene fluoride) (PVDF) compatibilizer. It is found that the electrical threshold for both PMMA/CNT and PMMA/PVDF/CNT nanocomposites lies between 0.5 to 1 wt% of CNTs. The thermal and mechanical properties of the nanocomposites increase with CNTs and they are further increased by the addition of PVDF. For 5 wt% CNT reinforced PMMA/PVDF/CNT nanocomposite, the onset of decomposition temperature is about 17 °C higher and elastic modulus is about 19.5% higher than those of neat PMMA. Rheological study also shows that the CNTs incorporated in the PMMA/PVDF/CNT nanocomposites act as physical cross-linkers.
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Araújo, Edcleide Maria, K. D. Araujo, and Taciana Regina de Gouveia Silva. "Physical Properties of Nylon 66/Organoclay Nanocomposites." Materials Science Forum 530-531 (November 2006): 702–8. http://dx.doi.org/10.4028/www.scientific.net/msf.530-531.702.

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Анотація:
Nanocomposites containing nylon 66 and montmorillonite clay organically modified with quaternary ammonium salts were obtained via direct melt intercalation. A montmorillonite sample from Boa Vista/PB, Northeast of Brazil, was treated with three types of quaternary ammonium salts such as Genamin, Praepagen and Cetremide. After the treatment, the powder was characterized by X-ray diffraction (XRD). The produced nanocomposites were characterized by Torque Rheometer, Infrared Spectroscopy (FTIR), mechanical properties and HDT. The obtained results for rheological characterization showed that the nanocomposites did not present deterioration with the presence of modified clay. Generally, the mechanical properties of tensile of the systems presented superior values compared to that of pure Ny 66. HDT's properties presented very interesting values for the nanocomposites and significantly larger than for pure nylon 66.
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Kausar, Ayesha. "A review of fundamental principles and applications of polymer nanocomposites filled with both nanoclay and nano-sized carbon allotropes – Graphene and carbon nanotubes." Journal of Plastic Film & Sheeting 36, no. 2 (October 21, 2019): 209–28. http://dx.doi.org/10.1177/8756087919884607.

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Advancements in polymer/nanoclay nanocomposites have supported the development of distinctive preparation strategies and characteristic features. High-performance polymer/nanoclay nanocomposites have applications in aerospace, automotive, construction, environmental, and biomedicine. To further improve polymer/nanoclay nanocomposite performance, nanoclay nanobifillers have been considered. In this regard, nano-sized carbon allotropes are potential contenders to form nanoclay nanobifillers. This article presents a detailed and state-of-the-art review on polymer/nanoclay nanobifiller nanocomposites. The primary focus of this pioneering effort is to deliver an up-to-date overview on polymer/nanoclay nanobifiller nanocomposites along with their categorization, fabrication, properties, and uses. Nanoclay nanobifiller designs using carbon nanotube, graphene, and fullerene are considered. Consequently, ensuing nanocomposite categories are discussed including polymer/nanoclay-carbon nanotube, polymer/nanoclay-graphene, and polymer/nanoclay-fullerene nanocomposites. The dispersion properties and alignment of nanoclay nanobifiller in polymeric nanocomposites have been investigated. Enhancing the interfacial bonding strength between matrix and nanoclay nanobifiller enhances the resulting nanocomposite physical properties. Application areas for polymer/nanoclay nanobifiller nanocomposites include supercapacitors, non-flammable materials, and self-healing materials. The discussion also highlights potential future directions for this emerging research field. Forthcoming advancements in polymer/nanoclay nanobifiller nanocomposites must focus the intensive design control, nanobifiller functionality, new processing techniques, superior dispersion, and enhanced features to further broaden the application prospects of these materials.
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Gudkov, Sergey V., Dmitriy E. Burmistrov, Vasily N. Lednev, Aleksander V. Simakin, Oleg V. Uvarov, Roman N. Kucherov, Petr I. Ivashkin, Alexey S. Dorokhov, and Andrey Yu Izmailov. "Biosafety Construction Composite Based on Iron Oxide Nanoparticles and PLGA." Inventions 7, no. 3 (July 20, 2022): 61. http://dx.doi.org/10.3390/inventions7030061.

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Анотація:
Nanocomposites based on polymers and nanoparticles are used in agriculture for photoconversion of solar radiation, as a basis for covering material, as a packaging material, and as functional films. At the same time, nanocomposites are almost never used in agriculture as biosafe structural materials. In this work, we have developed a technology for obtaining a nanocomposite based on PLGA and iron oxide nanoparticles. The nanocomposite has unique physical and chemical properties and also exhibits pronounced antibacterial properties at a concentration of iron oxide nanoparticles of more than 0.01%. At the same time, the nanocomposite does not affect the growth and development of pepper and is biocompatible with mammalian cells. Nanocomposites based on PLGA and iron oxide nanoparticles can be an attractive candidate for the manufacture of structural and packaging materials in agriculture.
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Більше джерел

Дисертації з теми "Nanocomposites - Physical Properties"

1

Kalakonda, Parvathalu. "Thermal Physical Properties Of Nanocomposites Of Complex Fluids." Digital WPI, 2013. https://digitalcommons.wpi.edu/etd-dissertations/301.

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"Composites of nanoparticles with complex fluids represent a unique physical system where thermal physical properties of the components partially or fully mix and new behavior can emerge. Traditional composites are relatively well understood as the superposition, weighted by volume or mass, of the components properties and the interfacial interactions play the role of holding the composite together. As the filler component, nanoparticle, decreases in size, the surface area begins to dominate, leading to unique behavior of the nanocomposites. The richness of the nanocomposites that can be designed by coupling various nanoparticles and complex fluid materials opens a wide field of active research. This dissertation presents a series of experimental studies on various nanocomposites using modulated differential scanning calorimetry, spectroscopic ellipsometry, dielectric spectroscopy, polarizing microscopy, and conductivity measurements of nanoparticles such as multi-wall carbon nanotubes and quantum dots on the phase transitions of several liquid crystals and polymers. The liquid crystals (LCs) and liquid crystalline polymer (LCP) of interest are: negative dielectric anisotropy alkoxyphenylbenzoate (9OO4), octylcyanobiphenyl (8CB), decylcyanobiphenyl (10CB), and isotactic polypropylene (iPP) which can form smectic liquid crystal (LC) phase. Studies have been carried out as a function of concentration and temperature spanning through various ordered phases. The results indicate a mixture of ordering and disordering effects of the nanoparticles on the phases of the complex fluids. In 9OO4/CNT system, dipole moment of liquid crystal and graphene like surface can allow a random dispersion of CNT to promote both orientational and positional order. For nCB/CNT, nCB/Quantum dot (QD) systems, nanoparticles induce net disordering effect in LC media. The effect of QDs on LC depends on the anchoring conditions and the QDs size. The results clearly demonstrate that the nematic phase imposes self-assembly on QDs to form one dimensional arrays. This leads to net disordering effect. The thermal/electrical conductivity changes in thin films of iPP/CNT sheared/un-sheared samples and it also varies with temperature for the purpose of inducing anisotropy of those properties in parallel and perpendicular to average orientation. The percolation threshold is clearly pronounced in both conductivities due to pressing and shearing treatment of the films. This will further our abilities to nano-engineer material for many important applications."
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2

Wincheski, Russell A. "Characterization of the physical properties of iron polyimide nanocomposites." W&M ScholarWorks, 1999. https://scholarworks.wm.edu/etd/1539623960.

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The discovery of tunneling magneto-resistance has led to a great deal of interest in the study of ferromagnet-insulator-ferromagnet (FIF) systems due to potential sensor and magnetic storage applications. An analysis of the band structure of the 3d ferromagnets shows that the conduction electrons become spin polarized by the molecular field. The transmission coefficient of these electrons across a tunneling gap therefore depends upon the relative alignment of the molecular field between the two ferromagnets.;In this work the manufacture of such tunneling gaps through compression molding of powdered ferromagnetic iron with a high performance polyimide has been studied for the first time. The percent change in the resistance with applied magnetic field depends critically on the volume percentage of ferromagnetic material in the composite. A peak in the tunneling magnetoresistance (TMR) occurs at a volume concentration just beneath the percolation threshold of the ferromagnetic material. The change in resistance relative to the resistance at zero field, DeltaR/R0, obtains a room temperature peak value of -4.5% at 20% iron volume concentration.;Granular conducting systems near the percolation threshold are also subject to variable range hopping (VRH) conduction. The charging energy of small metallic grains results in an energy barrier for the acceptance of an additional electron. Electronic conduction requires thermal activation over this barrier along with tunneling through the insulating regime. The result of these two combined processes is a temperature dependent tunneling distance and a conductivity of the form ln sigma ∝ T-x, with 1/4 ≤ x ≤ 1/2.;The theoretical development and experimental measurements of TMR and VRH in iron polyimide nanocomposites are thoroughly developed and analyzed in this work. Ferromagnet particle size and band structure effects on TMR are also explored in an effort to optimize the material for sensor applications.
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3

Nasiri, Aida. "Development of Safe-by-Design Nano-composites for Food Packaging Application." Thesis, Montpellier, 2017. http://www.theses.fr/2017MONTT076.

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Анотація:
Ce projet contribue à développer la prochaine génération de nano-emballages en utilisant une approche plus sûre et éco-conçue avec des avantages directs à la fois pour l'environnement et la sécurité des consommateurs. Les emballages alimentaires constituent l’un des principaux secteurs d’applications des nanotechnologies avec des enjeux environnementaux prometteurs de substitution des pétro-plastiques par des bio-plastiques et de réduction des pertes et gaspillages alimentaires grâce à des emballages plus performants, de type actifs et intelligents. Dans le cas de matériaux nano-composites (matrice polymérique contenant des nano-particules) destinés au contact alimentaire, le risque majeur en terme de santé humaine est lié à leur impact sur la migration de composés indésirables de l’emballage vers l’aliment (stabilisants UV, antioxydants, plastifiants, etc) qui peuvent avoir des effets néfastes en fonction des doses et durées d’exposition. Ces interactions contenant/contenu sont soumises à une réglementation européenne dont l’objectif est la protection de la santé du consommateur en fixant des limites de migration spécifique pour tous les composés supposés entrer dans la composition des matériaux plastiques dédiés au contact alimentaire. Dans le cas des nanomatériaux, la présence de nanoparticules est susceptible de modifier les interactions entre le polymère et les additifs et par voie de conséquence leurs propriétés de transfert. Ainsi, la formalisation des phénomènes de migration de l’emballage vers l’aliment établie sur des matériaux plastiques ne contenant pas de nanoparticules ne peut pas être directement transposée au nano-matériaux. De plus la présence de ces nanoparticules peut profondément modifier l’éco-toxicité environnementale du système matrice- nanoparticule -additif.La présente étude vise à comprendre et contrôler l’impact des structures nanocomposites (matrice polymérique contenant des nano-particules) sur les propriétés de transport (diffusivité et solubilité) des nanoparticules et des additifs chimiques en condition d’usage. À cet égard, il est nécessaire de combler le déficit de connaissances dans a caractérisation de la structure 3D, des propriétés physico-chimique et des interactions aux interfaces entre nanoparticules et matrice dans les nanomatériaux. Devant la complexité du système étudié, la modélisation est indispensable pour représenter (simplifier sans pour autant perdre trop de connaissances) la structure 3D des nanomatériaux et simuler, reproduire puis prédire, l’évolution de leurs propriétés de transfert en fonction des paramètres structurels et en condition d’usage. La modélisation des transferts est également indispensable pour, dans une approche d’ingénierie inverse, éco-concevoir et dimensionner à façon des nano-emballages sûrs pour l’Homme et l’Environnement. Dans cette optique une démarche de modélisation multi-échelle des relations structure/propriétés de transfert de masse a été mise en place sur des matériaux nanocomposites ciblés choisis pour leur pertinence dans le domaine de l’emballage alimentaire
The market of nanotechnologies is dominated by the food packaging area which amounts more than 20% of the total nanotechnologies market in 2015. However, the wide-scale use of nanomaterials raises important questions about environmental and safety issues that could hinder their development. In the case of plastics intended to be in contact with food, the risk of contamination concerns not only the nanoparticles but also all the chemical additives added during the material processing. The presence of nanoparticles is susceptible to modify the interactions between polymer and the additives with a possible change in their transport properties and therefore the food contamination.The present work aims at identifying the relationship between the structural characteristic and the transport properties (diffusivity and solubility) of nanoparticles and chemical additives incorporated in nanocomposites. In this regard, it is necessary to fill the gap of knowledge in 3D nanostructure characterization and a multi-scale modeling of mass transfer properties of nanocomposites in real usage conditions.In this way, polyethylene and nanoclay were selected based on the best compromise between real potential applications and the scientific knowledge previously published and eventually the nanocomposites were synthesized with LLDPE, Cloisite20 and a compatibilizer by melt intercalation method.The nanocomposite structure was characterized using TEM, X-ray nanotomography, TGA and XRD then submitted to migration tests undertaken in contact with different food simulants which represent various types of food (aqueous, acid, alcoholic) following the recommendation of the European regulation on the food contact material. To evaluate the positive or adverse effects of the nanomaterials on the contamination of the food by chemical additives which are usually incorporated with the plastic packaging, the virgin polymer and nanocomposite material were spiked with a mixture of the additives exhibiting various volatility, polarity and molecular weight. Then, the transport properties (i.e inertia) of nanocomposite structure was distinctively investigated on kinetic (apparent diffusion coefficient) and thermodynamic (partition coefficient) considerations.The results indicated that nanoclay addition in plastic materials favorably reduced the migration of additives by modifying both their diffusivity in the polymer and their partition between the polymer and the food simulant. However, while the partition coefficient of additives increases in nanocomposite in comparison to pure LLDPE for the samples in contact with all types of food simulants, the reduction of diffusion coefficient is significantly dependent on the nature of the food simulant in contact. Hence, it can be concluded that the major role in the migration of additives is not played by the imposed tortuosity path, but by the factors such as the affinity between the base polymer and simulants as well as the effects of simulants on swelling and crystallinity of the samples. Moreover, the effect of additive-related parameters and the structural parameters were assessed and put in perspective with their impact on the transport properties of nanostructures. Integrating the results of characterization and transfer properties led to an improved understanding of the influence of structure of nanocomposites on their mass transfer properties and therefore on the suitability of using them as food contact materials
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4

Nel, Alicia. "Investigation of the effect of chitin nanowhiskers distribution on structural and physical properties of high impact polypropylene/chitin nanocomposites." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/95981.

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Анотація:
Thesis (MSc)--Stellenbosch University, 2014.
ENGLISH ABSTRACT: Polymer composites have been gaining more importance in our daily lives because of the favorable properties that can be provided by these types of material. A polymer composite consists of improved properties when compared to the individual polymers that it is compiled of. The reason that composites are better than the individual polymers is mainly because composites are a combination of all the bene cial properties from the individual materials that was used to make the polymer composite. High impact polypropylene (HiPP) is a complex copolymer that was developed to overcome the restrictions of polypropylene (PP). Although PP have excellent properties at lower temperatures, it loses these advantages at elevated temperatures. High impact polypropylene has a much better impact strength and is processable at high temperatures. High impact polypropylene has been studied in depth for its applications and its superior properties such as an improved impact strength. The tensile properties, after the incorporation of a nano ller, have however not been investigated to our knowledge. Nano llers have reinforcing abilities due to the nano-scale diameters. Particles that have sizes on a nanometer range are mostly devoid of defects. Nano llers that are biopolymers have additional advantages such that can consist of antimicrobial abilities, renewability, biocompatibility and biodegradability. Composites reinforced with chitin nanowhiskers (chnw) have shown to have valuable applications in the latest medical, industrial and environmental developments. Di erent loadings of chnw were incorporated into a HiPP matrix in order to investigate the e ects that this nano ller will have on the tensile properties of HiPP. There were two challenges that required attention during the incorporation of chnw into HiPP. The rst major challenge was the poor interaction that exist between chnw and HiPP due to the hydrophobic nature of the HiPP matrix and the hydrophilic nature of chnw. The second problem was the agglomeration that can occur because of the hydrogen bonding between the chnw that is caused by the structure of the chnw chains. In order to gain the best dispersion of chnw within the HiPP matrix it was necessary to use compatibilizers and di erent methods of incorporation. The two types of compatibilizers that were chosen to improve the compatibility between the HiPP matrix and chnw were polypropylenegraft- maleic anhydride (PPgMA) and poly(ethylene-co-vinyl alcohol)(EVOH). Injection molding is typically used to process HiPP and was chosen as one of the methods for incorporating chnw into the HiPP matrix. A second method of incorporation was used speci cally for the nancomposites containing EVOH known as electrospinning combined with meltpressing. Tensile testing, DSC, TGA and FTIR were used to investigate the changes in the mechanical and thermal properties of the nanocomposites. SEM and TEM were employed to investigate the morphology of the electrospun ber mats and to characterize the chnw. FTIR as well as TGA were used to characterize the chitin nanowhiskers and to identify the individual components within the nanocomposites after incorporation took place. The incorporation of chnw along with the compatibilizer did show improvement in some mechanical properties of the polymer matrix. However, the in uence that each type of compatiblizer had on this e ect varied depending on the content of the chnw and compatibilizer with regards to the polymer matrix.
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Guha, Ingrid F. "Effects of silica nanoparticle surface treatment and average diameter on the physical and mechanical properties of poly(dimethylsiloxane)-silica nanocomposites." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/118564.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2010.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 35-37).
The purpose of this thesis was to quantify the effects of silica nanoparticle surface treatments and average silica nanoparticle diameter on various macroscopic properties of poly(dimethylsiloxane)-silica nanocomposites, specifically stiffness, wettability, and permeability to organic solvents. Poly(dimethylsiloxane)-silica nancomposites were prepared with constant amounts (4.8 wt%, 1.8 vol%) of fumed silica nanoparticles with varying surface treatments (hexamethyldisilazane and octamethylcyclotetrasiloxane) and varying particle diameter (7 and 12 nm). The Young's elastic modulus, mass increase due to dodecane absorption after 10 minutes, and advancing and receding water contact angles were measured for each nanocomposite. PDMS-silica nanocomposites containing untreated silica nanoparticles were found to have a higher Young's elastic modulus than nanocomposites containing hexamethyldisilazane-treated silica nanoparticles with the same diameter. However, nanocomposites containing identically sized silica nanoparticles with and without the octamethylcyclotetrasiloxane surface treatment had the same stiffness. The average nanocomposite stiffness increased slightly as the untreated silica nanoparticle diameter decreased from 12 nm to 7 nm. Varying the surface treatment or particle diameter of the filler did not significantly affect the level of dodecane absorption or the wettability of the nanocomposite. All nanocomposites showed approximately 20-23 wt% increase from dodecane absorption after 10 minutes of dodecane immersion. All nanocomposites exhibited average advancing contact angles around 115-120° and average receding contact angles around 85-90°. Nanocomposites were imaged using optical coherence tomography to examine particle dispersion. Potential differences in particle dispersion are discussed.
by Ingrid F. Guha.
S.B.
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Ali, Samer Shaur. "Fundamental interactions and physical properties of starch, poly vinyl alcohol and montmorillonite clay based nanocomposites prepared using solution mixing and melt extrusion." Thesis, Kansas State University, 2010. http://hdl.handle.net/2097/6983.

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Master of Science
Department of Grain Science and Industry
Sajid Alavi
Plastics from petroleum sources are the main raw materials used for producing food packaging films. But these plastic films cause a great environmental concern due to their non-degradable nature and non-renewable source. Biodegradable polymers like starch can be used as a base material which can replace petroleum based plastics packaging. In this study, starch (0-80%) and polyvinyl alcohol (PVOH) (20-100%) were used as base polymers to produce nanocomposites. Glycerol (30%) and sodium montmorillonite (0-20%) were used as a plasticizer and nano-filler, respectively. Nanocomposites were produced through two methods: solution and melt extrusion method. Extrusion method resulted in greater exfoliation of nanocomposites than solution method because it provided more shear stress to disrupt the layered silicate structure. In extrusion method, a lab scale extruder was used to produce these nanocomposites and films were made by casting. Process parameters, including screw speed (200-400 RPM) and barrel temperature (145-165[superscript]oC), were varied systematically. X-ray diffraction (XRD) and transmission electron microscopy (TEM) were conducted to characterize the nanostructure of these nanocomposites. Thermal characterization of these films was carried out through differential scanning calorimetric (DSC) studies. Results from XRD and TEM explained the phenomenon of intercalation and exfoliation in these nanocomposites. Structural and thermal data indicated important role for Na[superscript]+MMT along with process parameters in controlling exfoliation and glass transition temperature of the nanocomposites. These results also helped in understanding the fundamental interactions among all the components. The tensile strength and elongation at break of films ranged from 4.72 to 23.01MPa and 63.40 to 330.15% respectively, while water vapor permeability ranged from 1.68 to 0.79g.mm/kPa.h.m[superscript]2. These results provide a great understanding for further improvements in order to bring these films close to commercial plastic films which have superior tensile strength (10-80MPa), elongation at break (200-800%) and water vapor permeability (0.002- 0.05g.mm/kPa.h.m[superscript]2). The cost for polyethylene is approximately $0.70/lb while the raw material cost for this starch based films is approximately $0.85/lb.
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7

Aldroe, Hanaya. "Analyse des propriétés physiques et mécaniques des nanocomposites polyamide 12 / cloisite® 30B en lien avec leurs nanostructures." Thesis, Tours, 2014. http://www.theses.fr/2014TOUR4034/document.

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Les nanocomposites suscitent un intérêt croissant depuis leur développement dans les années 90 par Toyota. Par conséquent, l'amélioration des propriétés de ce type de matériaux est un enjeu fort tant d'un point de vue fondamental qu'industriel. Cette amélioration peut passer par un choix pertinent des charges renforçantes ajoutées à la matrice notamment en ce qui concerne le type, la géométrie, la proportion et le traitement de ces charges. L’optimisation des paramètres d’élaboration du mélange y joue aussi un rôle important. L’objectif de ce travail est de contribuer à l’identification et à la compréhension des mécanismes à l'origine du renforcement des matrices thermoplastiques par des nanocharges. Cet aspect est abordé à travers l’étude des propriétés thermiques et mécaniques des nanocomposites formés d’une matrice Polyamide 12 (PA12) chargées par des nanoparticules d’argile organiquement modifiée. Plus précisément, nous avons analysé les effets de la fraction massique des charges et du vieillissement naturel sur les propriétés structurales, thermiques et mécaniques de ces nanocomposites. L’influence des conditions de mélangeage sur ces propriétés ont aussi été examinées. Nous avons particulièrement mis l’accent sur l’identification des liens qui existent entre les propriétés macroscopiques et la structure des nanocomposites. Nous avons aussi fait une étude comparative des propriétés viscoélastiques de ces matériaux à l'état fondu et à l'état solide, ce qui représente une des originalités forte de ce travail
Nanocomposites are interestingly growing since their development in the 1990s by Toyota Company. Therefore, improving the properties of such materials is a major issue from fundamental and industrial point of view. This improvement can pass through a relevant choice of reinforcing loads added to the matrix particularly regarding the type, geometry, the proportion, and the treatment of these fillers. The processing parameters of the mixture play also a key role. The objective of this work is to contribute to the identification and understanding of the mechanisms at the origin of the reinforcing thermoplastic matrices by nanofillers. This aspect presented through the study of the thermal and mechanical properties of nanocomposites formed by a polyamide 12 matrix (PA12) filled with organically modified clay nanoparticles. More specifically, we analysed the effects of the filler mass fraction and environmental aging on structural, thermal and mechanical properties of these nanocomposites. The mixing conditions on these properties were also examined. A particular attention has been paid to the study of relationships between the macroscopic properties and the structure of nanocomposites. Viscoelastic properties of these materials in both melt and solid states were compared, which represents one of the originalities of this work
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Bhole, Y. S. "Investigations on gas permeation and related physical properties of structurally architectured aromatic polymers (polyphenylene oxides and polyarylates), polyarlate-clay nanocomposites and poly ( ionic liquid)." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 2007. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/2578.

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9

Ali, Zulfiqar [Verfasser], Hans-Joachim [Akademischer Betreuer] Radusch, and G. [Akademischer Betreuer] Heinrich. "Analysis of morphology development during the mixing process of rubber-clay nanocomposites and correlation to their mechanical-physical properties / Zulfiqar Ali. Betreuer: Hans-Joachim Radusch ; G. Heinrich." Halle, Saale : Universitäts- und Landesbibliothek Sachsen-Anhalt, 2009. http://d-nb.info/102489617X/34.

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10

Njuguna, Michael Kamau. "Characterisation of multi wall carbon nanotube–polymer composites for strain sensing applications." Thesis, Queensland University of Technology, 2012. https://eprints.qut.edu.au/54671/1/Michael_Kamau_Njuguna_Thesis.pdf.

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Carbon nanotubes (CNTs) have excellent electrical, mechanical and electromechanical properties. When CNTs are incorporated into polymers, electrically conductive composites with high electrical conductivity at very low CNT content (often below 1% wt CNT) result. Due to the change in electrical properties under mechanical load, carbon nanotube/polymer composites have attracted significant research interest especially due to their potential for application in in-situ monitoring of stress distribution and active control of strain sensing in composite structures or as strain sensors. To sucessfully develop novel devices for such applications, some of the major challenges that need to be overcome include; in-depth understanding of structure-electrical conductivity relationships, response of the composites under changing environmental conditions and piezoresistivity of different types of carbon nanotube/polymer sensing devices. In this thesis, direct current (DC) and alternating current (AC) conductivity of CNT-epoxy composites was investigated. Details of microstructure obtained by scanning electron microscopy were used to link observed electrical properties with structure using equivalent circuit modeling. The role of polymer coatings on macro and micro level electrical conductivity was investigated using atomic force microscopy. Thermal analysis and Raman spectroscopy were used to evaluate the heat flow and deformation of carbon nanotubes embedded in the epoxy, respectively, and related to temperature induced resistivity changes. A comparative assessment of piezoresistivity was conducted using randomly mixed carbon nanotube/epoxy composites, and new concept epoxy- and polyurethane-coated carbon nanotube films. The results indicate that equivalent circuit modelling is a reliable technique for estimating values of the resistance and capacitive components in linear, low aspect ratio-epoxy composites. Using this approach, the dominant role of tunneling resistance in determining the electrical conductivity was confirmed, a result further verified using conductive-atomic force microscopy analysis. Randomly mixed CNT-epoxy composites were found to be highly sensitive to mechanical strain and temperature variation compared to polymer-coated CNT films. In the vicinity of the glass transition temperature, the CNT-epoxy composites exhibited pronounced resistivity peaks. Thermal and Raman spectroscopy analyses indicated that this phenomenon can be attributed to physical aging of the epoxy matrix phase and structural rearrangement of the conductive network induced by matrix expansion. The resistivity of polymercoated CNT composites was mainly dominated by the intrinsic resistivity of CNTs and the CNT junctions, and their linear, weakly temperature sensitive response can be described by a modified Luttinger liquid model. Piezoresistivity of the polymer coated sensors was dominated by break up of the conducting carbon nanotube network and the consequent degradation of nanotube-nanotube contacts while that of the randomly mixed CNT-epoxy composites was determined by tunnelling resistance between neighbouring CNTs. This thesis has demonstrated that it is possible to use microstructure information to develop equivalent circuit models that are capable of representing the electrical conductivity of CNT/epoxy composites accurately. New designs of carbon nanotube based sensing devices, utilising carbon nanotube films as the key functional element, can be used to overcome the high temperature sensitivity of randomly mixed CNT/polymer composites without compromising on desired high strain sensitivity. This concept can be extended to develop large area intelligent CNT based coatings and targeted weak-point specific strain sensors for use in structural health monitoring.
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Книги з теми "Nanocomposites - Physical Properties"

1

Physical properties and applications of polymer nanocomposites: Physical properties and applications. Cambridge, UK: Woodhead Pub., 2010.

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Dasari, Aravind, and James Njuguna, eds. Functional and Physical Properties of Polymer Nanocomposites. Chichester, UK: John Wiley & Sons, Ltd, 2016. http://dx.doi.org/10.1002/9781118542316.

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3

ZnO bao mo zhi bei ji qi guang, dian xing neng yan jiu. Shanghai Shi: Shanghai da xue chu ban she, 2010.

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4

Tjong, S. C., and Y. W. Mai. Physical Properties of Polymer Nanocomposites. Taylor & Francis Group, 2010.

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5

Tjong, S. C., and Y. W. Mai. Physical properties and applications of polymer nanocomposites. Woodhead Publishing Limited, 2010. http://dx.doi.org/10.1533/9780857090249.

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6

Dasari, Aravind. Functional and Physical Properties of Polymer Nanocomposites. Wiley & Sons, Limited, John, 2016.

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7

Njuguna, James, and Aravind Dasari. Functional and Physical Properties of Polymer Nanocomposites. Wiley & Sons, Incorporated, John, 2016.

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8

Njuguna, James, and Aravind Dasari. Functional and Physical Properties of Polymer Nanocomposites. Wiley & Sons, Incorporated, John, 2016.

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9

Tjong, S. C., and Y. W. Mai. Physical Properties and Applications of Polymer Nanocomposites. Elsevier Science & Technology, 2016.

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10

Tjong, S. C., and Y. W. Mai. Physical Properties and Applications of Polymer Nanocomposites. Elsevier Science & Technology, 2010.

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Частини книг з теми "Nanocomposites - Physical Properties"

1

Powell, Clois E., and Gary W. Beall. "Physical Properties of Polymer/Clay Nanocomposites." In Physical Properties of Polymers Handbook, 561–75. New York, NY: Springer New York, 2007. http://dx.doi.org/10.1007/978-0-387-69002-5_33.

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Fukushima, Kikku, and Giovanni Camino. "Polymer Nanocomposites Biodegradation." In Functional and Physical Properties of Polymer Nanocomposites, 57–91. Chichester, UK: John Wiley & Sons, Ltd, 2016. http://dx.doi.org/10.1002/9781118542316.ch4.

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3

Rao, C. N. R., G. U. Kulkarni, and P. J. Thomas. "Physical and Chemical Properties of Nano-Sized Metal Particles." In Metal-Polymer Nanocomposites, 1–35. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2004. http://dx.doi.org/10.1002/0471695432.ch1.

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Allia, Paolo, Marco Sangermano, and Alessandro Chiolerio. "Magnetic Properties of Polymer Nanocomposites." In Functional and Physical Properties of Polymer Nanocomposites, 119–37. Chichester, UK: John Wiley & Sons, Ltd, 2016. http://dx.doi.org/10.1002/9781118542316.ch6.

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Roppolo, Ignazio, Marco Sangermano, and Alessandro Chiolerio. "Optical Properties of Polymer Nanocomposites." In Functional and Physical Properties of Polymer Nanocomposites, 139–57. Chichester, UK: John Wiley & Sons, Ltd, 2016. http://dx.doi.org/10.1002/9781118542316.ch7.

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6

Zope, Indraneel S., and Aravind Dasari. "High-Temperature-Resistant Polymer Nanocomposites." In Functional and Physical Properties of Polymer Nanocomposites, 183–201. Chichester, UK: John Wiley & Sons, Ltd, 2016. http://dx.doi.org/10.1002/9781118542316.ch9.

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7

Nguyen, T. Thuy Minh, Sathish K. Lageshetty, and Paul Bernazzani. "Enhanced Physical Properties of Thin Film Nanocomposites." In Characterization of Minerals, Metals, and Materials 2017, 147–60. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-51382-9_17.

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8

Araújo, Edcleide M., K. D. Araujo, and T. R. Gouveia. "Physical Properties of Nylon 66/Organoclay Nanocomposites." In Materials Science Forum, 702–8. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-423-5.702.

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9

Shankar, Shiv, and Jong-Whan Rhim. "Polymer Nanocomposites for Food Packaging Applications." In Functional and Physical Properties of Polymer Nanocomposites, 29–55. Chichester, UK: John Wiley & Sons, Ltd, 2016. http://dx.doi.org/10.1002/9781118542316.ch3.

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Dasari, Aravind, and James Njuguna. "Introduction." In Functional and Physical Properties of Polymer Nanocomposites, 1–6. Chichester, UK: John Wiley & Sons, Ltd, 2016. http://dx.doi.org/10.1002/9781118542316.ch1.

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Тези доповідей конференцій з теми "Nanocomposites - Physical Properties"

1

Goh, C. S., J. Wei, and M. Gupta. "Characterization of Mg/MgO Nanocomposites Synthesized Using Powder Metallurgy Technique." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-79872.

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Magnesium nanocomposites with 0.1, 0.2, 0.3 and 0.4 volume percentages of MgO were synthesized using the powder metallurgy technique. The nanocomposite billets obtained were subsequently hot extruded at a temperature of 350 °C with an extrusion ratio of 20.25:1. The extruded nanocomposites were characterized for their microstructural, physical and mechanical properties. The microstructures of the nanocomposites showed individual particles of MgO uniformly distributed in the magnesium matrix. The thermomechanical analysis results revealed that a more thermally stable magnesium nanocomposite could be obtained with a threshold amount of MgO. The tensile properties results indicated that the yield strength peaks at 0.3 vol.% of reinforcement incorporated, with an improvement of approximately 17%. An attempt is made to correlate the volume fraction of the MgO with the resultant physical and mechanical properties of the magnesium nanocomposites.
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2

Bardadym, Yulia, and Edward Sporyagin. "The Influence of the Physical Fields on the Structure and Physical Properties Nanocomposites." In 2018 IEEE 8th International Conference Nanomaterials: Application & Properties (NAP). IEEE, 2018. http://dx.doi.org/10.1109/nap.2018.8915347.

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3

Zukas, Walter, Michael Sennett, Elizabeth Welsh, Axel Rodriguez, David Ziegler, and Paul Touchet. "PERMEATION BEHAVIOR AND PHYSICAL PROPERTIES OF NATURAL RUBBER NANOCOMPOSITES." In Proceedings of the 24th US Army Science Conference. WORLD SCIENTIFIC, 2006. http://dx.doi.org/10.1142/9789812772572_0061.

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4

Bartolucci, Stephen F., Gaurav Mago, Halil Gevgilili, Seda Vural, Kimberly Dikovics, Dilhan M. Kalyon, and Frank T. Fisher. "Investigation of the Properties of PEEK-Nanotube Composites Prepared by Solution Methods." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-11938.

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Poly(ether ether ketone) (PEEK) is an aromatic, very high temperature semi-crystalline polymer which exhibits a technologically useful combination of mechanical and chemical properties. In this study carbon nanofibers (CNFs) were used to prepare nanocomposites from PEEK using a polymer crystallization technique at intermediate temperatures. The solution processing technique was used to uniformly disperse the CNFs in the polymer solution and to prepare the nanocomposite samples with different loading of CNFs. Microstructural characterization shows dispersion at very low loading of CNFs, but agglomerates were formed at higher loading. Thermal analysis was used as a means to understand the effect of CNFs on the physical properties of the PEEK nanocomposites.
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5

Roy, Sunanda, Swarup Roy, Ruth M. Muthoka, Hyun Chan Kim, Hargsoon Yoon, and Jaehwan Kim. "Polydopamine-nanocellulose nanocomposites: physical and electrical properties for biomedical electrodes." In Nano-, Bio-, Info-Tech Sensors and 3D Systems, edited by Jaehwan Kim. SPIE, 2019. http://dx.doi.org/10.1117/12.2513875.

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6

Adigoppula, Vinay K., Waseem Khan, Rajib Anwar, Avni A. Argun, and R. Asmatulu. "Graphene Based Nafion® Nanocomposite Membranes for Proton Exchange Membrane Fuel Cells." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-62751.

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Nanocomposite proton-exchange membranes are fabricated by loading graphene nanoflakes into perfluoro sulfonic acid polymer (Nafion) solutions at controlled amounts (1–4 wt%) followed by electrical and thermal characterization of the resulting membranes. Electronic and ionic conductivity values of the nanocomposites, as well as their dielectric and thermal properties improve at increased graphene loadings. Owing to graphene’s exceptionally high surface area to volume ratio and excellent physical properties, these nanocomposite are promising candidates for proton-exchange membrane fuel cell applications.
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7

Tebeta, R. T., D. M. Madyira, A. M. Fattahi, and H. M. Ngwangwa. "Study of Mechanical Properties of Polyethylene/CNT Nanocomposites: Experimental, FEM and MD." In International Conference on Mechanical, Automotive and Mechatronics Engineering. Aksaray: ECER, 2023. http://dx.doi.org/10.53375/icmame.2023.163.

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Designing and developing a new material can be challenging due to several aspects that require consideration. Materia behavior, material properties (physical or chemical), and other material characteristics are the factors to consider when developing new materials. In this work, polymer-based nanocomposite material is developed using High-Density Polyethylene (HDPE) as a matrix, Single-walled Carbon Nanotube (SWCNTs) as the reinforcing particles. Moreover, the mechanical properties of the produced HDPE/SWCNT nanocomposites, such as elastic modulus, were investigated at different weight fractions of SWCNTs. The investigation was conducted using numerical (Molecular Dynamics MD), theoretical (Finite Element Method FEM), and experimental approaches. The major aim of this study was to validate the accuracy of the developed MD model and the theoretical FEM with the experimental results. The obtained elastic modulus results from the MD and FEM were compared to see which method produced the results correlating with the experimental results. The compared results showed that MD results were consistent with the experimental results, even though they are not accurate, though the model can be improved. However, the FEM results do not correlate with the experimental results, hence the FEM model developed is not better for the prediction of the elastic modulus of HDPE/SWCNTs nanocomposites.
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8

Alali Almaadeed, Mariam, Noorunnisa Khanam Patan, Mabrouk Ouederni, Eileen Harkin Jones, and Beatriz Mayoral. "New Processing Technique To Improve Physical And Mechanical Properties Of Graphene Nanocomposites." In Qatar Foundation Annual Research Conference Proceedings. Hamad bin Khalifa University Press (HBKU Press), 2014. http://dx.doi.org/10.5339/qfarc.2014.eepp0726.

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9

Russo, P., D. Acierno, F. Capezzuto, G. G. Buonocore, L. Di Maio, and M. Lavorgna. "Thermoplastic polyurethane/graphene nanocomposites: The effect of graphene oxide on physical properties." In THE SECOND ICRANET CÉSAR LATTES MEETING: Supernovae, Neutron Stars and Black Holes. AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4937308.

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10

Bellisario, D., F. Quadrini, L. Santo, and G. M. Tedde. "Manufacturing of Antibacterial Additives by Nano-Coating Fragmentation." In ASME 2018 13th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/msec2018-6415.

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This study demonstrates the potential of a novel technique called nano-coating fragmentation to produce silver nanocomposites with antibacterial properties. This process starts from the production of an antibacterial additive without the separate production of silver nanoparticles. The additive was produced by depositing a silver nanofilm on polypropylene (PP) pellets by a physical vapor deposition sputtering process. Different set of sputtering parameters were used and different percentage of Ag were deposited on pellets. Afterwards, PP coated pellets were inserted in an injection molding machine to produce, in a single step, the nanocomposite by using shear forces. In facts, nanoparticles originate by the fragmentation of nano-coatings. The homogenously distributed silver particles were observed by microscope onto the nanocomposite surfaces. Thermal and mechanical properties of the nanocomposites were measured as well. The presence of dispersed nanofiller was confirmed by DSC analysis of the molded samples.
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Звіти організацій з теми "Nanocomposites - Physical Properties"

1

Barnes, Eftihia, Jennifer Jefcoat, Erik Alberts, Hannah Peel, L. Mimum, J, Buchanan, Xin Guan, et al. Synthesis and characterization of biological nanomaterial/poly(vinylidene fluoride) composites. Engineer Research and Development Center (U.S.), September 2021. http://dx.doi.org/10.21079/11681/42132.

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The properties of composite materials are strongly influenced by both the physical and chemical properties of their individual constituents, as well as the interactions between them. For nanocomposites, the incorporation of nano-sized dopants inside a host material matrix can lead to significant improvements in mechanical strength, toughness, thermal or electrical conductivity, etc. In this work, the effect of cellulose nanofibrils on the structure and mechanical properties of cellulose nanofibril poly(vinylidene fluoride) (PVDF) composite films was investigated. Cellulose is one of the most abundant organic polymers with superior mechanical properties and readily functionalized surfaces. Under the current processing conditions, cellulose nanofibrils, as-received and 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO) oxidized, alter the crystallinity and mechanical properties of the composite films while not inducing a crystalline phase transformation on the 𝛾 phase PVDF composites. Composite films obtained from hydrated cellulose nanofibrils remain in a majority 𝛾 phase, but also exhibit a small, yet detectable fraction of 𝛼 and ß PVDF phases.
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