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Polymers, paint and wood industries, Polymères, industries des peintures et bois, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Industrie des polymeres, peintures, bois, Polymer industry, paints, wood, Technologie des polymères, Technology of polymers, Formes d'application et semiproduits, Forms of application and semi-finished materials, Matériaux composites, Composites, Argile organique, Organic clay, Arcilla orgánica, Caoutchouc nitrile, Nitrile rubber, Caucho nitrilo, Compatibilisant, Compatibilizer, Compatibilizante, Composé de l'ammonium quaternaire, Quaternary ammonium compound, Amonio cuaternario compuesto, Etude expérimentale, Experimental study, Estudio experimental, Matériau composite, Composite material, Material compuesto, Matériau renforcé dispersion, Dispersion reinforced material, Material renforzado dispersión, Montmorillonite, Montmorilonita, Nanocomposite, Nanocompuesto, Propriété mécanique, Mechanical properties, Propiedad mecánica, Propriété rhéologique, Rheological properties, Propiedad reológica, Propriété thermique, Thermal properties, Propiedad térmica, Propriété traction, Tensile property, Propiedad tracción, Relation mise en oeuvre propriété, Property processing relationship, Relación puesta en marcha propiedad, SBR, Température transition vitreuse, Glass transition temperature, Temperatura transición vítrosa, Traitement surface, Surface treatment, Tratamiento superficie, Viscoélasticité, Viscoelasticity, Viscoelasticidad, Vulcanisat, Vulcanizate, and Vulcanizado

Different montmorillonites either, completely hydrophilic (Mont-0), amphiphilic (Mont-25, Mont-50, and Mont-75) or completely hydrophobic (Mont-100) were used as reinforcing fillers for styrene butadiene rubber (SBR) and acrylonitrile butadiene rubber (NBR) individually to predict the influence of the different forms on the properties of the rubbers (rheometric characteristics and mechanical properties). The shifts in the glass transition temperatures after the clay insertion were determined from dynamic mechanical thermal analysis to investigate the preference and action of each form. In addition, the storage moduli were used as indications to the corresponding mechanical properties of the samples. The influences could be followed after comparing the impacts of aging conditions on the properties of rubber compositions. The obtained data may provide a platform to suggest the mechanism by which these forms can in some cases act as compatibilizers in addition to their reinforcing/plasticizing effect when employed with the physically incompatible NBR/SBR (50/50) blend, which helps to optimize the properties of nanocomposites based on these blends. The proposed mechanism of action showed good correlation with the results of the mechanical properties and x-ray diffraction investigations as well. .

Biochemistry, molecular biology, biophysics, Biochimie, biologie moléculaire, biophysique, Analytical chemistry, Chimie analytique, Pharmacology drugs, Pharmacologie, galénique, Sciences exactes et technologie, Exact sciences and technology, Chimie, Chemistry, Chimie analytique, Analytical chemistry, Méthodes chromatographiques et méthodes physiques associées à la chromatographie, Chromatographic methods and physical methods associated with chromatography, Méthodes chromatographiques en phase gazeuse, Gas chromatographic methods, Autres méthodes chromatographiques, Other chromatographic methods, Sciences appliquees, Applied sciences, Pollution, Traitement et pollution des eaux, Water treatment and pollution, Elément trace, Trace element, Elemento traza, Adsorbant, Adsorbent, Adsorbente, Analyse chimique, Chemical analysis, Análisis químico, Analyse trace, Trace analysis, Análisis huella, Application, Aplicación, Article synthèse, Review, Artículo síntesis, Capacité adsorption, Adsorption capacity, Capacidad adsorción, Chromatographie HPLC, HPLC chromatography, Cromatografía HPLC, Chromatographie phase gazeuse, Gas chromatography, Cromatografía fase gaseosa, Colorant organique, Organic dye, Colorante orgánico, Composé organique, Organic compounds, Compuesto orgánico, Décontamination, Decontamination, Descontaminación, Enrichissement chimique, Chemical enrichment, Enriquecimiento químico, Extraction SPE, Solid phase extraction, Extracción SPE, Fer II Fer III Oxyde, Iron II Iron III Oxides, Hierro II Hierro III Óxido, Fer III Oxyde, Iron III Oxides, Hierro III Óxido, Maghémite, Maghemite, Maghemita, Magnétite, Magnetite, Magnetita, Matériau modifié, Modified material, Material modificado, Métal lourd, Heavy metal, Metal pesado, Nanoparticule, Nanoparticle, Nanopartícula, Particule magnétique, Magnetic particles, Pesticide, Pesticides, Plaguicida, Pollution eau, Water pollution, Contaminación agua, Préparation surface, Surface preparation, Preparación superficie, Préparation échantillon, Sample preparation, Preparación muestreo, Préparation, Preparation, Preparación, Résidu, Residue, Resíduo, Sorption, Sorción, Séparation magnétique, Magnetic separation, Separación magnética, Traitement eau, Water treatment, Tratamiento agua, Traitement surface, Surface treatment, Tratamiento superficie, Particule core-shell, Core-shell particle, Magnetic nanoparticles, Magnetic solid-phase extraction, Metal detoxification, Pesticide residue analysis, and Preconcentration

In recent years, water pollution and pesticide accumulation in the food chain have become a serious environmental and health hazard problem. Direct determination of these contaminants is a difficult task due to their low concentration level and the matrix interferences. Therefore, an efficient separation and preconcentration procedure is often required prior to the analysis. With the advancement in nanotechnology, various types of magnetic core-shell nanoparticles have successfully been synthesized and received considerable attention as sorbents for decontamination of diverse matrices. Magnetic core-shell nanoparticles with surface modifications have the advantages of large surface-area-to-volume ratio, high number of surface active sites, no secondary pollutant, and high magnetic properties. Due to their physicochemical properties, surface-modified magnetic core-shell nanoparticles exhibit high adsorption efficiency, high rate of removal of contaminants, and easy as well as rapid separation of adsorbent from solution via external magnetic field. Such facile separation is essential to improve the operation efficiency. In addition, reuse of nanoparticles would substantially reduce the treatment cost. In this review article, we have attempted to summarize recent studies that address the preconcentration methods of pesticide residue analysis and removal of toxic contaminants from aquatic systems using magnetic core-shell nanoparticles as adsorbents.

Polymers, paint and wood industries, Polymères, industries des peintures et bois, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Industrie des polymeres, peintures, bois, Polymer industry, paints, wood, Technologie des polymères, Technology of polymers, Formes d'application et semiproduits, Forms of application and semi-finished materials, Matériaux composites, Composites, Acrylate copolymère, Acrylate copolymer, Acrilato copolímero, Composé allylique, Allylic compound, Compuesto alílico, Copolymère réticulé, Crosslinked copolymer, Copolímero reticulado, Effet concentration, Concentration effect, Efecto concentración, Effet mémoire forme, Shape memory effect, Efecto memoria forma, Etude expérimentale, Experimental study, Estudio experimental, Limite élasticité, Yield strength, Límite elasticidad, Matériau composite, Composite material, Material compuesto, Matériau renforcé dispersion, Dispersion reinforced material, Material renforzado dispersión, Morphologie, Morphology, Morfología, Nanocomposite, Nanocompuesto, Polymérisation photochimique, Photopolymerization, Polimerización fotoquímica, Propriété mécanique, Mechanical properties, Propiedad mecánica, Propriété thermique, Thermal properties, Propiedad térmica, Préparation, Preparation, Preparación, Prépolymère, Prepolymer, Prepolímero, Rayonnement UV, Ultraviolet radiation, Radiación ultravioleta, Température transition vitreuse, Glass transition temperature, Temperatura transición vítrosa, Traitement surface, Surface treatment, Tratamiento superficie, Uréthanne copolymère, Urethane copolymer, Uretano copolímero, Uréthanne polymère, Polyurethane, Uretano polímero, Graphène oxyde, UV cure, graphene oxide, hybrids, polyurethanes, and shape memory

Graphene oxide modified chemically with allyl isocyanate (iGO) was incorporated in various amounts into acrylate-terminated polyurethane (PU) via UV curing. The effects of this incorporation on the morphological, mechanical, dynamic mechanical, thermal and shape memory properties of the resulting hybrids were examined. The iGO nanoparticles incorporated into the PU chains acted as both multifunctional crosslinks and reinforcing fillers, and the effects were most pronounced at low iGO contents (0.5 and 1.0 wt%). Consequently, the glassy and rubbery state moduli, yield strength, glass transition temperature, shape fixity and shape recovery ratios were increased on adding up to 1 wt% iGO. At higher iGO loadings, the values of most of these properties decreased due to aggregation and the auto-inhibition of allyl compounds.

Polymers, paint and wood industries, Polymères, industries des peintures et bois, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Industrie des polymeres, peintures, bois, Polymer industry, paints, wood, Technologie des polymères, Technology of polymers, Formes d'application et semiproduits, Forms of application and semi-finished materials, Matériaux composites, Composites, Copolymère séquencé, Block copolymer, Copolímero secuencia, Cristallinité, Crystallinity, Cristalinidad, Cristallisation isotherme, Isothermal crystallization, Cristalización isotérmica, Effet concentration, Concentration effect, Efecto concentración, Etude expérimentale, Experimental study, Estudio experimental, Interaction intermoléculaire, Intermolecular interaction, Interacción intermolecular, Lactone copolymère, Lactone copolymer, Lactona copolímero, Lactone polymère, Lactone polymer, Lactona polímero, Matériau composite, Composite material, Material compuesto, Morphologie, Morphology, Morfología, Nanocomposite, Nanocompuesto, Point quantique, Quantum dot, Punto cuántico, Polymère optiquement actif, Optically active polymer, Polímero ópticamente activo, Préparation, Preparation, Preparación, Styrène copolymère, Styrene copolymer, Estireno copolímero, Séléniure de cadmium, Cadmium selenides, Séparation phase, Phase separation, Separación fase, Traitement surface, Surface treatment, Tratamiento superficie, Lactide copolymère, Lactide polymère, Stéréocomplexe, block copolymer, chirality, hybrid materials, nanoparticle, and quantum dot

A new nanoparticle/block copolymer (NP/BCP) hybrid material combining the unique properties of BCP poly(styrene)-b-poly(D-lactide) (PS-b-PDLA) and inorganic NP quantum dots CdSe was developed. A systematic study on the microphase separation of a series of PS-b-PDLAs by small-angle X-ray scattering showed that the degree of order of the separated microdomains depended on the initial state of the BCP and the measurement temperature and can be improved through isothermal crystallization of PDLA, thermal annealing and shear field etc. Incorporating a small amount of NPs into the BCP matrix can improve the mobility of the polymer chains and thus promote self-assembly of the BCP, which leads to hierarchically ordered structures. Excess NPs, however, cannot be completely incorporated into the PDLA domains, resulting in the phase transformation of the BCP, destruction of the ordered structure and even macroscopic phase separation due to the aggregation of NPs. An important observation is that stereocomplexation between PDLA and poly(L-lactide) could provide a driving force to promote microphase separation of the BCP. The strategy presented in the current work has potential applications for developing highly ordered NP/BCP hybrid materials.

Polymers, paint and wood industries, Polymères, industries des peintures et bois, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Industrie des polymeres, peintures, bois, Polymer industry, paints, wood, Technologie des polymères, Technology of polymers, Formes d'application et semiproduits, Forms of application and semi-finished materials, Matériaux composites, Composites, Aniline copolymère, Aniline copolymer, Anilina copolímero, Corrosion électrochimique, Electrochemical corrosion, Corrosión electroquímica, Etude expérimentale, Experimental study, Estudio experimental, Imide copolymère, Imide copolymer, Imida copolímero, Matériau composite, Composite material, Material compuesto, Perméabilité gaz, Gas permeability, Permeabilidad gas, Polycondensation, Condensation polymerization, Policondensación, Procédé sol gel, Sol gel process, Procedimiento sol gel, Propriété transport, Transport properties, Propiedad transporte, Propriété électrochimique, Electrochemical properties, Propiedad electroquímica, Préparation, Preparation, Preparación, Revêtement anticorrosion, Corrosion protective coatings, Résistance corrosion, Corrosion resistance, Resistencia corrosión, Silice, Silica, Sílice, Traitement surface, Surface treatment, and Tratamiento superficie

In this study, a series of electroactive polyimide/SiO2 (EPIS) composite materials containing conjugated segments of electroactive amino-capped aniline trimer (AT) unit were successfully prepared. First of all, the amino-modified silica (AMS) particles of ~100 nm in diameter were synthesized by performing the conventional base-catalyzed sol―gel reactions. Subsequently, the AMS nanoparticles were blending into the polymerization reactions between AT and 4,4ʹ-(4,4ʹ-isopropylidenediphenoxy)-bis(phthalic anhydride), leading to the formation of EPIS composites. The as-prepared EPIS materials in the form of coating on cold-rolled steel (CRS) electrode were found to be much superior in corrosion protection over those of non-electroactive polyimide and EPI materials based on a series of electrochemical corrosion measurements in saline. The significant enhancement in corrosion protection of EPIS coatings on CRS electrodes might probably be attributed to the redox catalytic property of organic EPI inducing the formation of passive metal oxide layer and the barrier property of well-dispersed AMS nanoparticles existed in EPI matrix.

Polymers, paint and wood industries, Polymères, industries des peintures et bois, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Industrie des polymeres, peintures, bois, Polymer industry, paints, wood, Technologie des polymères, Technology of polymers, Formes d'application et semiproduits, Forms of application and semi-finished materials, Matériaux composites, Composites, Acide sulfonique, Sulfonic acid, Acido sulfónico, Agent accrochage, Coupling agent, Agente enganche, Benzooxazole dérivé polymère, Benzoxazole derivative polymer, Benzooxazol derivado polímero, Epoxyde résine, Epoxy resin, Epóxido resina, Etude expérimentale, Experimental study, Estudio experimental, Fibre synthétique, Synthetic fiber, Fibra sintética, Interface fibre matrice, Matrix fiber interface, Interfase fibra matriz, Matériau renforcé fibre, Fiber reinforced material, Material reforzado fibra, Molécule polyédrique, Polyhedral molecule, Molécula poliédrica, Mélange polymère, Polymer blends, Oligomère, Oligomer, Oligómero, Polymère aromatique, Aromatic polymer, Polímero aromático, Propriété interface, Interface properties, Propiedad interfase, Propriété surface, Surface properties, Propiedad superficie, Rugosité, Roughness, Rugosidad, Silane organique, Organic silane, Silano orgánico, Silsesquioxane polymère, Silsesquioxane polymer, Silsesquioxano polímero, Traitement surface, Surface treatment, Tratamiento superficie, and Benzobisoxazole(p-phénylène) polymère

A novel three-step approach of methanesulfonic acid/γ-aminopropyl triethoxy silane/GlycidylEthyl polyhedral oligomeric silsesquioxane (MSA/KH550/POSS) was proposed to functionalize the surface of high modulus poly (p-phenylene-2,6-benzobisoxazole) (HMPBO) fibers. Results indicated that GlycidylEthyl POSS was successfully grafted on the surface of HMPBO fibers and the surface roughness of HMPBO fibers was increased obviously. The single fiber pull-out strength of POSS-g-HMPBO/epoxy resin microcomposite was improved to 1.19 MPa, better than that of native HMPBO/epoxy resin microcomposite.

Materials, Matériaux, Polymers, paint and wood industries, Polymères, industries des peintures et bois, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Industrie des polymeres, peintures, bois, Polymer industry, paints, wood, Technologie des polymères, Technology of polymers, Formes d'application et semiproduits, Forms of application and semi-finished materials, Stratifiés, Laminates, Produits de revêtement. Peintures, vernis et encres, Coatings. Paints, varnishes and inks, Formation et durcissement des feuils, propriétés, essais, Film formation and curing, properties, testing, Additif, Additive, Aditivo, Adhésivité, Adhesivity, Adhesividad, Benzimidazole polymère, Polybenzimidazole, Benzimidazol polímero, Effet concentration, Concentration effect, Efecto concentración, Emission fumée, Smoke emission, Emisión humo, Epoxyde résine, Epoxy resin, Epóxido resina, Etude expérimentale, Experimental study, Estudio experimental, Fibre carbone, Carbon fiber, Fibra carbón, Fibre minérale, Mineral fiber, Fibra inorgánica, Matériau composite, Composite material, Material compuesto, Matériau renforcé dispersion, Dispersion reinforced material, Material renforzado dispersión, Matériau renforcé fibre, Fiber reinforced material, Material reforzado fibra, Matériau revêtement, Coating material, Material revestimiento, Propriété surface, Surface properties, Propiedad superficie, Propriété thermique, Thermal properties, Propiedad térmica, Résistance feu, Fire resistance, Resistencia fuego, Stabilité thermique, Thermal stability, Estabilidad térmica, Stratifié, Laminate, Estratificado, Traitement par plasma, Plasma assisted processing, Traitement surface, Surface treatment, Tratamiento superficie, Nanofibre carbone, carbon nanofibers, fire resistant coating, and structural composite

With increasing interest in epoxy-based carbon fiber composites for structural applications, it is important to improve the fire resistant properties of these materials. The fire resistant performance of these materials can be improved either by using high performance epoxy resin for manufacturing carbon fiber composite or by protecting the previously used epoxy-based composite with some fire resistant coating. In this context, work is carried out to evaluate the fire resistance performance of recently emerged high performance polybenzimidazole (PBI) when used as a coating material. Furthermore, the effect of carbon nanofibers (CNFs) on fire resistant properties of inherently flame retardant PBI coating was studied. Thermogravimetric analysis of carbon/epoxy composite, unfilled PBI and nano-filled PBI shows that the carbon/epoxy composite maintained its thermal stability up to a temperature of 400°C and afterwards showed a large decrease in mass, while both unfilled PBI and nano-filled PBI have shown thermal stability up to a temperature of 575°C corresponding to only 11% weight loss. Cone calorimeter test results show that unfilled PBI coating did not improve the fire retardant performance of carbon/epoxy composite. Conversely, nano-filled PBI coating has shown a significant improvement in fire retardant performance of the carbon/epoxy composite in terms of increased ignition time, reduced average and peak heat release rate and reduced smoke and carbon monoxide emission. These results indicate that addition of carbon nanofibers to inherently flame retardant coating can significantly be helpful for improving the fire resistance performance of composite materials even with low coating thickness.

Polymers, paint and wood industries, Polymères, industries des peintures et bois, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Industrie des polymeres, peintures, bois, Polymer industry, paints, wood, Technologie des polymères, Technology of polymers, Constituants de formulation, Compounding ingredients, Ignifugeants, retardateurs de flamme et réducteurs de fumée, Fireproof agents, Formes d'application et semiproduits, Forms of application and semi-finished materials, Matériaux composites, Composites, Additif, Additive, Aditivo, Agent accrochage, Coupling agent, Agente enganche, Dimension particule, Particle size, Dimensión partícula, Ethylène haute densité polymère, High density ethylene polymer, Etileno alta densidad polímero, Etude expérimentale, Experimental study, Estudio experimental, Hydroxyde de magnésium, Magnesium hydroxide, Magnesio hidróxido, Inflammabilité, Flammability, Inflamabilidad, Matériau composite, Composite material, Material compuesto, Matériau renforcé dispersion, Dispersion reinforced material, Material renforzado dispersión, Morphologie, Morphology, Morfología, Nanocomposite, Nanocompuesto, Oléfine polymère, Olefin polymer, Olefina polímero, Propriété mécanique, Mechanical properties, Propiedad mecánica, Propriété thermique, Thermal properties, Propiedad térmica, Propriété traction, Tensile property, Propiedad tracción, Retardateur flamme, Flame retardant, Retardador llama, Silane organique, Organic silane, Silano orgánico, Stabilité thermique, Thermal stability, Estabilidad térmica, Traitement surface, Surface treatment, and Tratamiento superficie

The modification of magnesium hydroxide (MH) with triethoxy vinyl silane (TVS) was carried out via three different methods and the results are discussed with respect to their effect on the flame retardant and the tensile properties of high density polyethylene (HDPE) nanocomposites. Via a xylene suspension of MH and TVS, via a water suspension of MH and TVS, and via powder mixing of MH and TVS. It was found that in all three cases, Si—O—Mg bonds formed on the MH particles surface. Also, this silane modification induced a certain level of particle agglomeration, but without modifying their morphology or particle size. It was also found that the flame retardant properties of the HDPE nanocomposites did not improve because of the use of silane modified MH. During the flame retardant tests, all nanocomposites passed the UL-94-HB, but it was observed that the flame permanence time was longer when using modified MH. The tensile properties were negatively affected by the addition of unmodified MH; the nanocomposites became hard and brittle, with reduced flexibility. This negative effect was diminished when using silane modified MH.

Polymers, paint and wood industries, Polymères, industries des peintures et bois, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Industrie des polymeres, peintures, bois, Polymer industry, paints, wood, Technologie des polymères, Technology of polymers, Formes d'application et semiproduits, Forms of application and semi-finished materials, Matériaux composites, Composites, Sciences biologiques et medicales, Biological and medical sciences, Sciences biologiques fondamentales et appliquees. Psychologie, Fundamental and applied biological sciences. Psychology, Industries agroalimentaires, Food industries, Généralités, General aspects, Manutention, stockage, conditionnement, transport, Handling, storage, packaging, transport, Amidon, Starch, Almidón, Argile organique, Organic clay, Arcilla orgánica, Biodégradabilité, Biodegradability, Biodegradabilidad, Composé de l'ammonium quaternaire, Quaternary ammonium compound, Amonio cuaternario compuesto, Effet concentration, Concentration effect, Efecto concentración, Emballage, Packaging, Empaque, Etude expérimentale, Experimental study, Estudio experimental, Indice oxygène, Oxygen index, Indice oxígeno, Matériau composite, Composite material, Material compuesto, Morphologie, Morphology, Morfología, Nanocomposite, Nanocompuesto, Oside polymère, Oside polymer, Osido polímero, Perméabilité gaz, Gas permeability, Permeabilidad gas, Produit alimentaire, Foodstuff, Producto alimenticio, Propriété biologique, Biological properties, Propiedad biológica, Propriété thermique, Thermal properties, Propiedad térmica, Propriété transport, Transport properties, Propiedad transporte, Traitement surface, Surface treatment, and Tratamiento superficie

Starch/clay bionanocomposites were prepared by incorporation of varying concentrations of nanoclay (Cloisite® 30B) through solution blending. The chemical interaction of starch with clay was evidenced from ultraviolet-visible (UV-visible) and fourier transform infrared spectroscopy. The material was also characterized through X-ray diffraction, transmission electron microscopy, and scanning electron microscopy study. The bionanocomposites were found to be more thermally stable as revealed from thermogravimetric analysis. The fire retardancy of the bionanocomposites was investigated from limiting oxygen index measurement. The result showed improvement of this property with increase in clay loading. From the measurement of oxygen permeabilities, it was found that the oxygen barrier property of starch/clay (10%) was improved by more than three times compared to virgin starch. The biodegradability of the material combined with the above mentioned properties could make it applicable as food packaging material.

Polymers, paint and wood industries, Polymères, industries des peintures et bois, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Industrie des polymeres, peintures, bois, Polymer industry, paints, wood, Technologie des polymères, Technology of polymers, Formes d'application et semiproduits, Forms of application and semi-finished materials, Matériaux composites, Composites, Conductivité électrique superficielle, Surface electrical conductivity, Conductividad eléctrica superficial, Cristallinité, Crystallinity, Cristalinidad, Effet concentration, Concentration effect, Efecto concentración, Etude expérimentale, Experimental study, Estudio experimental, Lactique acide polymère, Lactic acid polymer, Láctico ácido polímero, Matériau composite, Composite material, Material compuesto, Matériau renforcé dispersion, Dispersion reinforced material, Material renforzado dispersión, Module élasticité, Elastic modulus, Módulo elasticidad, Moulage injection, Injection molding, Moldeo por inyección, Nanocomposite, Nanocompuesto, Nanotube carbone, Carbon nanotubes, Nanotube multifeuillets, Multiwalled nanotube, Polymère aliphatique, Aliphatic polymer, Polímero alifático, Propriété mécanique, Mechanical properties, Propiedad mecánica, Propriété thermique, Thermal properties, Propiedad térmica, Propriété électrique, Electrical properties, Propiedad eléctrica, Renforcement mécanique, Strengthening, Refuerzo mecánico, Résistance traction, Tensile strength, Resistencia tracción, Stabilité thermique, Thermal stability, Estabilidad térmica, Traitement surface, Surface treatment, Tratamiento superficie, Cristallisation non isotherme, Fusion multiple, Nanotube carbone fonctionnalisé, and Polymère biodégradable

Structural, mechanical, thermal, and electrical properties of low-loaded (0—1.5 wt%), untreated, and treated (with heat and nitric acid) multiwalled carbon nanotubes (MWCNTs)/poly (lactic acid) (PLA) nanocomposites have been studied. Among all synthesized composites, acid-treated 1.0 wt% MWCNTs reinforced PLA shows superior tensile strength and modulus to those shown by other samples. All nanocomposites including the pure PLA exhibit the orthorhombic β-form crystalline structure with low degree of crystallization, as demonstrated by X-ray diffraction study. Differential scanning calorimetry (DSC) of injection molded samples, respectively, reveals an enhancement of PLA crystallinity by 8% and 14% for untreated and treated nanotubes, relating to the observed improvement in mechanical properties. Nanocomposites show double melting behavior when crystallized nonisothermally by DSC, whilst the pure PLA shows single melting character. Thermogravimetric analysis discloses that the MWCNTs-loaded sample degraded faster than PLA. Surface resistivity of the nanocomposites is found to be dropped drastically by a factor of 1013 with a low loading of MWCNTs (1.5 wt%). A detailed discussion and correlation of the observed structures and properties are presented in this study.

Materials, Matériaux, Polymers, paint and wood industries, Polymères, industries des peintures et bois, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Industrie des polymeres, peintures, bois, Polymer industry, paints, wood, Technologie des polymères, Technology of polymers, Formes d'application et semiproduits, Forms of application and semi-finished materials, Matériaux composites, Composites, Durcissement (matière plastique), Curing (plastics), Endurecimiento (material plástico), Epoxyde résine, Epoxy resin, Epóxido resina, Etude expérimentale, Experimental study, Estudio experimental, Graphite Oxyde, Graphite Oxides, Grafito Óxido, Groupe aminé, Amino group, Grupo aminado, Matériau composite, Composite material, Material compuesto, Matériau renforcé dispersion, Dispersion reinforced material, Material renforzado dispersión, Mécanisme réaction, Reaction mechanism, Mecanismo reacción, Nanocomposite, Nanocompuesto, Propriété mécanique, Mechanical properties, Propiedad mecánica, Propriété thermique, Thermal properties, Propiedad térmica, Renforcement mécanique, Strengthening, Refuerzo mecánico, Résistance traction, Tensile strength, Resistencia tracción, Température transition vitreuse, Glass transition temperature, Temperatura transición vítrosa, Traitement surface, Surface treatment, Tratamiento superficie, Graphène fonctionnalisé, Nanofeuillet, epoxy resin, functionalized graphene nanosheets, and mechanical properties

A chemically converted graphene/epoxy (EP) resin nanocomposite has been developed through the use of the functionalized graphene nanosheets (FGNs). The FGNs were prepared via the reaction of amines with alkylcarboxyl groups attached to the graphite oxides in the course of a dicarboxylic acid acyl peroxide treatment. FGNs/EP composites were prepared by dissolving the FGNs in organic solvent followed by mixing with EP and curing agent. In this composite, the FGNs were able to create molecular entanglement with EP matrix by taking advantage of the reactions between amine groups of FGNs and EP groups of EP, thus the FGNs could be covalently integrated into the EP matrix and became part of the cross-linked network structure rather than just a separated component. Great enhancement in the mechanical properties of the epoxy composite, such as the ultimate tensile strength and toughness, had been achieved with small loading (0.1 wt%) of FGNs by 17.0% and 262.2%, respectively. However, the FGNs reinforced EP composites showed a slight decrease in glass transition temperature (Tg).

Polymers, paint and wood industries, Polymères, industries des peintures et bois, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Industrie des polymeres, peintures, bois, Polymer industry, paints, wood, Technologie des polymères, Technology of polymers, Formes d'application et semiproduits, Forms of application and semi-finished materials, Matériaux composites, Composites, Angiospermae, Dicotyledones, Moraceae, Spermatophyta, Alcool copolymère, Alcohol copolymer, Alcohol copolímero, Aminoplaste, Aminoplast, Aminoplasto, Argile, Clay, Arcilla, Bois résineux, Softwood, Madera de coníferas, Capacité rétention eau, Water holding capacity, Capacidad retención agua, Composé de l'ammonium quaternaire, Quaternary ammonium compound, Amonio cuaternario compuesto, Copolymère réticulé, Crosslinked copolymer, Copolímero reticulado, Cristallinité, Crystallinity, Cristalinidad, Etude expérimentale, Experimental study, Estudio experimental, Ficus, Gomme naturelle, Natural gum, Goma natural, Inflammabilité, Flammability, Inflamabilidad, Matériau composite, Composite material, Material compuesto, Matériau renforcé dispersion, Dispersion reinforced material, Material renforzado dispersión, Morphologie, Morphology, Morfología, Mélange polymère, Polymer blends, Nanocomposite, Nanocompuesto, Oside polymère, Oside polymer, Osido polímero, Polycondensation, Condensation polymerization, Policondensación, Propriété chimique, Chemical properties, Propiedad química, Propriété mécanique, Mechanical properties, Propiedad mecánica, Propriété thermique, Thermal properties, Propiedad térmica, Propriété traction, Tensile property, Propiedad tracción, Résistance chimique, Chemical resistance, Resistencia química, Résistance flexion, Bending strength, Resistencia flexión, Silice, Silica, Sílice, Stabilité thermique, Thermal stability, Estabilidad térmica, Traitement surface, Surface treatment, Tratamiento superficie, Triazine dérivé copolymère, Triazine derivative copolymer, Triazina derivado copolímero, Composite bois polymère, Ficus hispida, and Furane dérivé copolymère

Wood polymer composites (WPC) based on nano SiO2 and nanoclay were prepared by the impregnation of melamine formaldehyde-furfuryl alcohol copolymer, 1,3-dimethylol 4,5-dihydroxy ethylene urea, a crosslinking agent, and a renewable polymer. Surface modification of SiO2 and formation of composites were characterized by Fourier Transform Infrared Spectroscopy (FTIR). X-ray diffractometry (XRD) studies indicated a decrease in crystallinity of the composites. The crystallinity index value of wood cellulose decreased from 63.8 to 30.8 as determined from FTIR and XRD studies. Scanning Electron Microscopy was used for morphological characterization. Transmission Electron Microscopy (TEM) showed uniform distribution of nano SiO2 and nanoclay in the composites. Remarkable reduction in water uptake capacity was observed for the treated wood samples. It was found to reduce from 142.2% to 30.2%. Both tensile and flexural properties increased upto 76.5% and 23.6%, respectively in the WPCs. An improvement in chemical resistance, flame retardancy and thermal stability were observed in the composites as a result of treatment.

Polymers, paint and wood industries, Polymères, industries des peintures et bois, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Industrie des polymeres, peintures, bois, Polymer industry, paints, wood, Technologie des polymères, Technology of polymers, Formes d'application et semiproduits, Forms of application and semi-finished materials, Matériaux composites, Composites, Bois feuillu, Hardwood, Madera de frondosas, Déchet bois, Wood waste, Desperdicio madera, Etude expérimentale, Experimental study, Estudio experimental, Glycérol, Glycerol, Glicerol, Matériau composite, Composite material, Material compuesto, Matériau renforcé dispersion, Dispersion reinforced material, Material renforzado dispersión, Morphologie, Morphology, Morfología, Oléfine polymère, Olefin polymer, Olefina polímero, Peuplier, Poplars, Propriété dynamomécanique, Dynamic mechanical properties, Propiedad dinamomecánica, Propriété mécanique, Mechanical properties, Propiedad mecánica, Propriété thermique, Thermal properties, Propiedad térmica, Propène polymère, Propylene polymer, Propeno polímero, Reprise humidité, Moisture regain, Reactivación humedad, Résistance choc, Impact strength, Resistencia choque, Résistance flexion, Bending strength, Resistencia flexión, Traitement surface, Surface treatment, Tratamiento superficie, Traitement thermique, Heat treatment, Tratamiento térmico, and Farine bois

This study aimed to investigate the combination effect of glycerin treatment and thermal modification of wood flour on the physical, mechanical, thermal dynamic mechanical properties of wood flour/polypropylene (PP) composite. The morphological aspect was also investigated. The wood flour was first impregnated in the aqueous solution of glycerin, followed by heat treatment at 200°C for 1 h. Then the unmodified or modified wood flour was blended with PP at a weight ratio of 4:6 to prepare composites. Moisture adsorption experiment and X-ray photoelectron spectroscopy analysis of wood flour demonstrated that the hygroscopicity and the free surface hydroxyl groups of wood flour decreased after glycerin-thermal modification. Thickness swelling of the 10% wt glycerin-thermally modified wood flour/PP composite was reduced by 42.8% after 96 h immersion as compared to unmodified control. Evaluation of mechanical properties in impact and flexure modes indicated that glycerin treatment alone had no significant effect, but the combination of glycerin and thermal treatment slightly decreased the strength, with the exception of 10% glycerin and heat modified sample. Dynamic mechanical analysis and scanning electron microscope illustrated the improved interfacial bonding between PP and wood flour modified by 10% glycerin and heat treatment.

Polymers, paint and wood industries, Polymères, industries des peintures et bois, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Industrie des polymeres, peintures, bois, Polymer industry, paints, wood, Technologie des polymères, Technology of polymers, Formes d'application et semiproduits, Forms of application and semi-finished materials, Stratifiés, Laminates, Composite hybride, Hybrid composite, Compuesto híbrido, Epoxyde résine, Epoxy resin, Epóxido resina, Etude expérimentale, Experimental study, Estudio experimental, Fibre carbone, Carbon fiber, Fibra carbón, Fibre minérale, Mineral fiber, Fibra inorgánica, Matériau aiguilleté, Needled material, Material cosado, Matériau composite, Composite material, Material compuesto, Matériau fibre unidirectionnelle, Unidirectional fiber material, Material fibra unidireccional, Matériau renforcé dispersion, Dispersion reinforced material, Material renforzado dispersión, Matériau renforcé fibre, Fiber reinforced material, Material reforzado fibra, Moulage sous vide, Vacuum molding, Moldeo en vacío, Moulage transfert, Transfer molding, Moldeo por transferencia, Nanocomposite, Nanocompuesto, Nanofibre, Nanofiber, Nanofibra, Ouvrabilité, Processability, Laborabilidad, Perméabilité, Permeability, Permeabilidad, Propriété mécanique, Mechanical properties, Propiedad mecánica, Propriété technologique, Technological properties, Propiedad tecnológica, Propriété transport, Transport properties, Propiedad transporte, Stratifié, Laminate, Estratificado, Tissu textile, Woven material, Tela textil, Tissu verre, Glass fiber fabric, Tela vidrio, Traitement surface, Surface treatment, Tratamiento superficie, Vinylester résine, Vinyl ester resin, Resina vinilester, and Nanofibre carbone

The addition of nanoparticles to polymeric matrices has shown great promise for improving mechanical and thermal properties; however, this improvement comes with a decrease of processability. In this study, two different glass fabrics were used. One of them was Windstrand, a stitched equally-biaxial R-glass fabric the other was Advantex, a unidirectional glass fiber mat. Both of them are provided by Owens Corning. The mats were sprayed with carbon nanofibers (CNF) on both sides. Mechanical properties of composites manufactured via vacuum-assisted resin transfer molding were obtained. Permeability, as a measure of processability, of the sprayed glass mats was measured. Mechanical properties are improved, whereas permeability decreases with the addition of CNF.

Polymers, paint and wood industries, Polymères, industries des peintures et bois, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Industrie des polymeres, peintures, bois, Polymer industry, paints, wood, Technologie des polymères, Technology of polymers, Formes d'application et semiproduits, Forms of application and semi-finished materials, Matériaux composites, Composites, Argile organique, Organic clay, Arcilla orgánica, Argile, Clay, Arcilla, Biodégradabilité, Biodegradability, Biodegradabilidad, Dégradation biologique, Biodegradation, Degradación biológica, Effet concentration, Concentration effect, Efecto concentración, Etude expérimentale, Experimental study, Estudio experimental, Fungi, Lactique acide polymère, Lactic acid polymer, Láctico ácido polímero, Matériau composite, Composite material, Material compuesto, Montmorillonite, Montmorilonita, Mélange polymère, Polymer blends, Nanocomposite, Nanocompuesto, Polycondensation, Condensation polymerization, Policondensación, Polymère aliphatique, Aliphatic polymer, Polímero alifático, Propriété biologique, Biological properties, Propiedad biológica, Propriété mécanique, Mechanical properties, Propiedad mecánica, Propriété thermique, Thermal properties, Propiedad térmica, Propriété traction, Tensile property, Propiedad tracción, Préparation, Preparation, Preparación, Stabilité thermique, Thermal stability, Estabilidad térmica, Styrène polymère, Styrene polymer, Estireno polímero, Traitement surface, Surface treatment, and Tratamiento superficie

Poly(lactic acid) (PLA) was synthesized using L-lactic acid by condensation polymerization. Polystyrene (PS) and surface modified montmorillonite (OMMT) was used for the preparation of PS:PLA composites and PS:PLA:OMMT nanocomposites. The composite materials prepared had varying amount of PLA (10―30%) and OMMT (0.5―5 phr). These composites were subjected to degradation in minimal medium using the fungi Aspergillus niger (A. niger) under controlled conditions. Scanning electron microscopy (SEM) showed the growth of microorganism on the polymer surface and fracture within the polymer matrix as a result of degradation. Fourier transform infra red spectroscopy (FTIR) was further used to determine the mechanism leading to biodegradation. It was found that the biodegradation of both PS:PLA and PS:PLA:OMMT took place mainly via break down and utilization of ester group, as can be seen from disappearance of absorption peak of ester group and simultaneous appearance of a typical IR absorption of microbial mass at 1450 cm―1. The thermal stability of PS:PLA:OMMT nanocomposites was found to increase with increasing concentration of OMMT, as observed from thermo gravimetric analysis (TGA), while mechanical property was found to be decreased after degradation at 30% of PLA and 5 wt% of OMMT content. Change in extracellular protein content, biomass production and % degradation with respect to time (up to 28 days) were studied and correlated to evaluate the effectiveness of A. niger in biodegradation of the composites.

Polymers, paint and wood industries, Polymères, industries des peintures et bois, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Industrie des polymeres, peintures, bois, Polymer industry, paints, wood, Technologie des polymères, Technology of polymers, Formes d'application et semiproduits, Forms of application and semi-finished materials, Matériaux composites, Composites, Agent accrochage, Coupling agent, Agente enganche, Conductivité thermique, Thermal conductivity, Conductividad térmica, Copolymère aromatique, Aromatic copolymer, Copolímero aromático, Céramique sans oxyde, Non oxide ceramics, Cerámica sin óxido, Dimension particule, Particle size, Dimensión partícula, Ether copolymère, Ether copolymer, Eter copolímero, Etude expérimentale, Experimental study, Estudio experimental, Matériau composite, Composite material, Material compuesto, Matériau renforcé dispersion, Dispersion reinforced material, Material renforzado dispersión, Modèle empirique, Empirical model, Modelo empírico, Modélisation, Modeling, Modelización, Nitrure d'aluminium, Aluminium nitride, Aluminio nitruro, Polymère fonctionnel, Functional polymer, Polímero funcional, Propriété thermique, Thermal properties, Propiedad térmica, Préparation, Preparation, Preparación, Silane organique, Organic silane, Silano orgánico, Traitement surface, Surface treatment, Tratamiento superficie, coupling agents, particle-reinforced composite, polyarylene ether nitrile, and thermal properties

Particulate-filled polyarylene ether nitrile (PEN) composites were prepared using methyltriethoxy-silane-treated aluminium nitride (AIN) as the filler for thermal modification. The effects of AIN fraction, particle size and surface treatment on the thermal performance of PEN were investigated. Thethermal conductivities of the composites increased when the AIN filler concentration was increased, as well as with decrement of the filler size. The thermal conductivity value of the composites increased up to 0.779 W m-1 K-1 when the AIN weight loading was 60 wt%. The trend of the thermal conductivities of the composites can be more efficiently predicted by theoretical models than empirical models. The composites exhibited stable performances of thermal decomposition and thermal expansion when AIN filler faction in the composites increased.

Polymers, paint and wood industries, Polymères, industries des peintures et bois, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Industrie des polymeres, peintures, bois, Polymer industry, paints, wood, Technologie des polymères, Technology of polymers, Formes d'application et semiproduits, Forms of application and semi-finished materials, Matériaux composites, Composites, Agent accrochage, Coupling agent, Agente enganche, Effet concentration, Concentration effect, Efecto concentración, Effet mémoire forme, Shape memory effect, Efecto memoria forma, Epoxyde résine, Epoxy resin, Epóxido resina, Etude expérimentale, Experimental study, Estudio experimental, Fibre carbone, Carbon fiber, Fibra carbón, Fibre minérale, Mineral fiber, Fibra inorgánica, Flexion, Bending, Flexión, Matériau composite, Composite material, Material compuesto, Nanocomposite, Nanocompuesto, Nanofibre, Nanofiber, Nanofibra, Perte mécanique, Mechanical loss, Pérdida mecánica, Propriété dynamomécanique, Dynamic mechanical properties, Propiedad dinamomecánica, Propriété mécanique, Mechanical properties, Propiedad mecánica, Propriété thermique, Thermal properties, Propiedad térmica, Préparation, Preparation, Preparación, Silane organique, Organic silane, Silano orgánico, Température transition vitreuse, Glass transition temperature, Temperatura transición vítrosa, Traitement surface, Surface treatment, Tratamiento superficie, Nanofibre carbone, and Polymère mémoire forme

Silanized vapor-grown carbon nanofiber/epoxy (silanized-VGCNF/EP) shape memory polymer (SMP) nanocomposites are successfully fabricated by using a composite molding technology. The surface functionalization of VGCNF is performed using an acid treatment followed by a reaction with silane. The oxidation as well as silanization of VGCNF and silanized-VGCNF/EP nanocomposites are systematically and explicitly characterized using various analytical methods. The influence of the silane-functionalized VGCNF on the properties of VGCNF/EP nanocomposites is investigated using field emission scanning electronic microscopy (FE-SEM) and a dynamic mechanical analysis (DMA). The shape memory properties of the silanized-VGCNF/EP nanocomposites are evaluated by a fold-deploy shape memory test. The results reveal that the silanized-VGCNF is preferably dispersed in the epoxy resin matrix. Furthermore, the glass transition temperature of silanized-VGCNF/EP nanocomposites is enhanced, and the shape memory properties of the silanized-VGCNF/EP nanocomposites are significantly improved.

Polymers, paint and wood industries, Polymères, industries des peintures et bois, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Industrie des polymeres, peintures, bois, Polymer industry, paints, wood, Technologie des polymères, Technology of polymers, Formes d'application et semiproduits, Forms of application and semi-finished materials, Matériaux composites, Composites, Agent accrochage, Coupling agent, Agente enganche, Composite hybride, Hybrid composite, Compuesto híbrido, Conductivité thermique, Thermal conductivity, Conductividad térmica, Constante diélectrique, Permittivity, Constante dieléctrica, Céramique sans oxyde, Non oxide ceramics, Cerámica sin óxido, Epoxyde résine, Epoxy resin, Epóxido resina, Etude expérimentale, Experimental study, Estudio experimental, Fibre minérale, Mineral fiber, Fibra inorgánica, Fibre verre, Glass fiber, Fibra vidrio, Matériau composite, Composite material, Material compuesto, Matériau renforcé dispersion, Dispersion reinforced material, Material renforzado dispersión, Matériau renforcé fibre, Fiber reinforced material, Material reforzado fibra, Nitrure de silicium, Silicon nitride, Silicio nitruro, Perte diélectrique, Dielectric loss, Pérdida dieléctrica, Propriété diélectrique, Dielectric properties, Propiedad dieléctrica, Propriété mécanique, Mechanical properties, Propiedad mecánica, Propriété thermique, Thermal properties, Propiedad térmica, Préparation, Preparation, Preparación, Résistance choc, Impact strength, Resistencia choque, Résistance flexion, Bending strength, Resistencia flexión, Silane organique, Organic silane, Silano orgánico, Traitement surface, Surface treatment, and Tratamiento superficie

Silicon nitride/glass fiber (Si3N4/GF) hybrid fillers are performed to prepare the Si3N4/GF/epoxy composites. Results showed the thermal conductivities of the Si3N4/GF/epoxy composites that are improved with the addition of Si3N4, and the thermal conductive coefficient λ is 1.412 W/mK with 38 vol% modified Si3N4/GF hybrid fillers (30 vol% Si3N4 + 8 vol% GF), seven times higher than that of pure epoxy resin. The flexural strength and impact strength of the composites are optimal with 13 vol% modified Si3N4/GF hybrid fillers (5 vol% Si3N4 + 8 vol% GF). The dielectric constant and dielectric loss of the composites are increased with the increasing addition of Si3N4. For a given Si3N4/GF hybrid fillers loading, the surface modification can further improve the thermal conductivities of the Si3N4/ GF/epoxy composites.

Polymers, paint and wood industries, Polymères, industries des peintures et bois, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Industrie des polymeres, peintures, bois, Polymer industry, paints, wood, Technologie des polymères, Technology of polymers, Formes d'application et semiproduits, Forms of application and semi-finished materials, Matériaux composites, Composites, Cinétique, Kinetics, Cinética, Durcissement (matière plastique), Curing (plastics), Endurecimiento (material plástico), Epoxyde résine, Epoxy resin, Epóxido resina, Etude expérimentale, Experimental study, Estudio experimental, Graphène, Graphene, Groupe aminé, Amino group, Grupo aminado, Matériau composite, Composite material, Material compuesto, Matériau renforcé dispersion, Dispersion reinforced material, Material renforzado dispersión, Morphologie, Morphology, Morfología, Nanocomposite, Nanocompuesto, Propriété dynamomécanique, Dynamic mechanical properties, Propiedad dinamomecánica, Propriété mécanique, Mechanical properties, Propiedad mecánica, Préparation, Preparation, Preparación, Résistance choc, Impact strength, Resistencia choque, Traitement surface, Surface treatment, Tratamiento superficie, and Graphène fonctionnalisé

Graphene, consisted of a single layer of carbon atom in a two-dimensional lattice, has superior electrical and physical properties that promise many exciting applications. In this study, graphenes were prepared from graphite powder by chemical method and their images were investigated by TEM and SEM. To develop high performance epoxy nanocomposites with good dispersion of graphenes and strong epoxy-graphene interfacial bonding, graphenes were amine-functionalized and the effects of the amine-functionalization on the curing behavior and physical properties of epoxy/graphene nanocomposites were studied. FTIR spectra confirmed the amine-functionalization. The physical properties of the nanocomposites were investigated by DSC, DMA, TMA, and impact tester. Fracture surfaces were investigated by SEM. The physical properties of the nanocomposites could be improved considerably by the amine-functionalization of graphenes.

Polymers, paint and wood industries, Polymères, industries des peintures et bois, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Industrie des polymeres, peintures, bois, Polymer industry, paints, wood, Technologie des polymères, Technology of polymers, Formes d'application et semiproduits, Forms of application and semi-finished materials, Matériaux composites, Composites, Agent accrochage, Coupling agent, Agente enganche, Conductivité électrique, Electrical conductivity, Conductividad eléctrica, Effet température, Temperature effect, Efecto temperatura, Etude expérimentale, Experimental study, Estudio experimental, Fibre minérale, Mineral fiber, Fibra inorgánica, Matériau composite, Composite material, Material compuesto, Matériau conducteur, Conducting material, Material conductor, Morphologie, Morphology, Morfología, Mullite, Mullita, Mécanisme réaction, Reaction mechanism, Mecanismo reacción, Nanocomposite, Nanocompuesto, Polymère aromatique, Aromatic polymer, Polímero aromático, Polymère conducteur, Conducting polymers, Polymère greffé, Graft polymers, Polymérisation oxydante, Oxidative polymerization, Polimerizacion oxidante, Propriété thermique, Thermal properties, Propiedad térmica, Propriété électrique, Electrical properties, Propiedad eléctrica, Propriété électrochimique, Electrochemical properties, Propiedad electroquímica, Préparation, Preparation, Preparación, Pyrrole polymère, Pyrrole polymer, Pirrol polímero, Silane organique, Organic silane, Silano orgánico, Stabilité thermique, Thermal stability, Estabilidad térmica, Traitement surface, Surface treatment, and Tratamiento superficie

After mullite fibers particles (MFPs) were surface modified, conductive polypyrrole (PPy) layer was chemically grafted on the surface of the self-assembled monolayer (SAM) coated MFPs, via in situ surface-initiated polymerization, resulting in SAM-MFPs/PPy composites. The composites possess high electrical conductivity at room temperature, weakly temperature dependence of the conductivity. The nanocomposite electrochemical properties displayed nearly symmetric charge-discharge characteristics and an ideal rectangular cyclic voltammogram. X-ray diffraction analysis confirmed that the main peaks of SAM-MFPs/PPy composites are similar to the SAM-MFPs, which reveal that the crystal structure of SAM-MFPs is well-maintained after the coating process under polymerization reaction conditions and exhibit semicrystalline behavior. Thermogravimetric analysis shows that the thermal stability of SAM-MFPs/PPy composites was enhanced and these can be attributed to the retardation effect of amine functionalized MFPs as barriers for the degradation of PPy. The morphology of SAM-MFPs/PPy composites showed the coaxial fibrous structure.