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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, Bismaléimide résine, Bismaleimide resin, Bismaleimida resina, Coefficient frottement, Friction coefficient, Coeficiente roce, Effet concentration, Concentration effect, Efecto concentración, Etude expérimentale, Experimental study, Estudio experimental, Matériau composite, Composite material, Material compuesto, Matériau renforcé dispersion, Dispersion reinforced material, Material renforzado dispersión, Nanocomposite, Nanocompuesto, Polymère ramifié, Branched polymer, Polímero ramificado, Propriété mécanique, Mechanical properties, Propiedad mecánica, Résine phénolique, Phenolic resin, Resina fenólica, Résistance choc, Impact strength, Resistencia choque, Silane polymère, Polysilane, Silano polímero, Silice, Silica, Sílice, Traitement surface, Surface treatment, Tratamiento superficie, Tribologie, Tribology, Tribología, Benzooxazine résine, Polymère hyperramifié, composites, friction, resins, and wear and lubrication

To improve the tribological properties of benzoxazine (BOZ) resin, bismaleimides (BMI) resin is chosen as organic phase, hyperbranched polysilane functionalized SiO2 nanoparticles (HBPSi-SiO2) are chosen as inorganic modifiers to prepare HBPSi-SiO2/ BOZ-BMI composites using high shear and ultrasonic processes. The effect of content of HBPSi-SiO2 on the mechanical properties and tribological properties of the composites are investigated. The results show that suitable addition of HBPSi-SiO2 can largely enhance the impact strength, reduce the friction coefficient, and wear rate of BOZ-BMI resin. Scanning electron microscopy is employed to research the wearing mechanism of materials. The severe wear of the BOZ pure resin is owing to fatigue wear, and the moderate wear of BOZ-BMI resin is attributed to adhesive wear. While, the mild wear of the composites with HBPSi-SiO2 is due to abrasive wear.

Polymers, paint and wood industries, Polymères, industries des peintures et bois, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Energie, Energy, Combustibles, Fuels, Pétrole et gaz. Produits pétroliers, Crude oil, natural gas and petroleum products, Pollution due à la production, au transport et au traitement du pétrole et des schistes bitumineux. Pollution des eaux et des sols. Traitements. Lutte contre la pollution, Pollution caused by production, transportation and treatment of oil and oil shales. Water and soil pollution. Treatments. Pollution control, 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, Alvéolaires, Cellular, Matériaux composites, Composites, Matière plastique, Plastics, Material plástico, Adsorbant, Adsorbent, Adsorbente, Angle contact, Contact angle, Angulo contacto, Caoutchouc liquide, Liquid rubber, Caucho líquido, Caoutchouc nitrile, Nitrile rubber, Caucho nitrilo, Capacité adsorption, Adsorption capacity, Capacidad adsorción, Condensation chimique, Condensation reaction, Condensación química, Copolymère réticulé, Crosslinked copolymer, Copolímero reticulado, Déversement pétrole, Oil spill, Derramamiento petróleo, Essence, Gasoline, Gasolina, Etude expérimentale, Experimental study, Estudio experimental, Hydrophobicité, Hydrophobicity, Hidrofobicidad, Matériau composite, Composite material, Material compuesto, Mécanisme réaction, Reaction mechanism, Mecanismo reacción, Plastique alvéolaire, Cellular plastic, Plástico espumoso, Pollution eau, Water pollution, Contaminación agua, Polyaddition, Poliadición, Polymère téléchélique, Telechelic polymer, Polímero telechélico, Propriété surface, Surface properties, Propiedad superficie, Solvant organique, Organic solvent, Solvente orgánico, Traitement surface, Surface treatment, Tratamiento superficie, Uréthanne copolymère, Urethane copolymer, Uretano copolímero, Graphène oxyde, Superhydrophobicité, adsorption, foams, functionalization of polymers, grafting, and polyurethanes

Graphene with amine group was covalently grafted on the polyurethane foam with nitrile group to form superhydrophobic foam. Fourier transform infrared spectroscopy (FTIR), atomic force microscopy (AFM), thermogravimetric analysis (TGA), optical contact angle measuring device, and scanning electron microscopy (SEM) were used to characterize the foam, showing the dodecane diamine was successfully grafted onto graphene oxide and the graphene oxide modified by dodecane diamine was successfully grafted onto polyurethane foam. Moreover, the modified foam exhibited a high contact angle (159.1 ± 2.3°) compared to unmodified foam (121.4 ± 3.2°). And that is due to the foam modified by amidation of graphene oxide can enhance the surface roughness and reduce the surface energy of the foam. Owing to modified foam was extremely hydrophobic and preferentially adsorbed oil other than water, the sorption capacity of the modified foam for toluene, gasoline, and diesel is 41, 27, and 26 g/g, respectively.

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, Fibres et fils, Fibers and threads, Résines échangeuses et membranes, Exchange resins and membranes, Etude expérimentale, Experimental study, Estudio experimental, Fibre creuse, Hollow fiber, Fibra hueca, Hydrophobicité, Hydrophobicity, Hidrofobicidad, Membrane poreuse, Porous membrane, Membrana porosa, Modification chimique, Chemical modification, Modificación química, Morphologie, Morphology, Morfología, Mouillabilité, Wettability, Remojabilidad, Propriété mécanique, Mechanical properties, Propiedad mecánica, Propriété traction, Tensile property, Propiedad tracción, Relation mise en oeuvre propriété, Property processing relationship, Relación puesta en marcha propiedad, Silane organique, Organic silane, Silano orgánico, Traitement par plasma, Plasma assisted processing, Traitement surface, Surface treatment, Tratamiento superficie, Vinylidène fluorure polymère, Vinylidene fluoride polymer, Vinilideno fluoruro polímero, PVDF hollow fiber membrane, alkaline treatment, hydrophobicity, organosilanes, plasma activation, and surface modification

This work investigates the membrane modification to enhance hydrophobicity aiming for applications as membrane contactors. The PVDF membranes were activated by NaOH and by plasma activation followed by grafting using three organosilanes. For the NaOH, the contact angle of original membranes (68°) was decreased from 44° to 31° with increasing NaOH concentration from 2.5M to 7.5M at 60°C for 3 h. The contact angle of NaOH treated membranes was increased to 100° after modification with 0.01M FAS-C8 for 24 h. A needle-like structure was observed on the membrane surface while there was no significant change in pore size and pore size distribution. Moreover, FTIR and XPS data showed Si peak and composition. The mechanical strength was improved. The surface modified membranes under helium plasma activation followed by grafting with 0.01M FAS-C8 for 24 h showed higher contact angle, mechanical strength and surface roughness than that obtained by NaOH activation method while other physical properties did not change. The long-term performance test for 15 days of operation was conducted. The modified membranes exhibited good stability and durability for CO2 absorption.

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, Appareillage et mise en oeuvre, Machinery and processing, Matières plastiques, Plastics, Revêtement, métallisation, coloration, Coating, metallization, dyeing, Agent accrochage, Coupling agent, Agente enganche, Dépôt centrifugation, Spin-on coating, Etude expérimentale, Experimental study, Estudio experimental, Europium Complexe, Europium Complexes, Europio Complejo, Fluorescence, Fluorescencia, Hydrophobicité, Hydrophobicity, Hidrofobicidad, Matériau fluorescent, Fluorescent material, Material fluorescente, Matériau revêtu, Coated material, Material revestido, Nanoparticule, Nanoparticle, Nanopartícula, Propriété optique, Optical properties, Propiedad óptica, Propriété surface, Surface properties, Propiedad superficie, Silane organique, Organic silane, Silano orgánico, Silice, Silica, Sílice, Traitement surface, Surface treatment, Tratamiento superficie, Transparence, Transparency, Transparencia, Uréthanne polymère, Polyurethane, Uretano polímero, Revêtement superhydrophobe, coatings, composites, functionalization of polymers, hydrophilic polymers, and polyurethanes

A superhydrophobic surface was prepared by spin-coating trimethylsiloxane functionalized SiO2 (TMS-SiO2) solutions onto a precoated polyurethane (PU) layer. The superhydrophobic coatings showed high stability with time, and the prepared coatings remained superhydrophobicity even after 6 months. Furthermore, the as-prepared surface showed high transparency with a transmittance above 70% in visible light region (400-800 nm). The transition of the composite surface from superhydrophobicity to hydrophilicity can be achieved by increasing the drying temperature. More interestingly, the surface showed excellent fluorescent property by the incorporation of fluorescent Europium (Eu) complex into the surface and without deteriorating the superhydrophobic and transparent properties. It was believed that the superhydrophobic surface with multifunction would broaden the applications of superhydrophobic 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, Acide laurique, Lauric acid, Láurico ácido, Butyrate(hydroxy) copolymère, Butyrate(hydroxy) copolymer, Butirato(hidroxi) copolímero, Cellulose, Celulosa, Cristallinité, Crystallinity, Cristalinidad, Effet concentration, Concentration effect, Efecto concentración, Ester copolymère, Ester copolymer, Ester copolímero, Etude expérimentale, Experimental study, Estudio experimental, Halogénure sulfonyle, Sulfonyl halide, Halogenuro sulfonilo, Matériau composite, Composite material, Material compuesto, Matériau renforcé dispersion, Dispersion reinforced material, Material renforzado dispersión, Morphologie, Morphology, Morfología, Mouillabilité, Wettability, Remojabilidad, Nanocomposite, Nanocompuesto, Nanocristal, Nanocrystal, Propriété dynamomécanique, Dynamic mechanical properties, Propiedad dinamomecánica, Propriété surface, Surface properties, Propiedad superficie, Propriété thermique, Thermal properties, Propiedad térmica, Stabilité thermique, Thermal stability, Estabilidad térmica, Traitement surface, Surface treatment, Tratamiento superficie, Butyrate(3-hydroxy) copolymère, Butyrate(4-hydroxy) copolymère, Cellulose nanocristalline, cellulose and other wood products, composites, mechanical properties, nanoparticles, nanowires and nanocrystals, and thermal properties

As a kind of reinforcing agent, the application of nanocrystalline cellulose (NCC) is widely limited in hydrophobic polymers owing to its rich hydroxyl surface. In this study, NCC was modified with lauric acid/p-toluensulfonyl chloride mixture, then the modified nanocrystalline cellulose (mNCC) was incorporated into biopolyester poly(3-hydroxybutyrate-co-4-hydroxybutyrate) (P(3,4)HB) by solution casting to prepare P(3,4)HB/mNCC nanocomposites. The prepared mNCC and P(3,4)HB/mNCC nanocomposites were characterized by Fourier transform-infrared, X-ray diffraction, contact angle test, transmission electron microscopy, scanning electron microscopy, differential scanning calorimetric, polarized optical microscope, dynamic mechanical analysis, and thermogravimetric analysis. The results show that the crystallinity and mechanical properties of P(3,4)HB are greatly improved due to the fact that NCC can be modified successfully and the mNCC can distribute uniformly in nanoscale in the matrix with good compatibility along the interface.

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, Traitement des déchets, Waste treatment, Acide stéarique, Stearic acid, Esteárico ácido, Agent accrochage, Coupling agent, Agente enganche, Cendre volante, Fly ash, Polvillo ceniza, Cristallinité, Crystallinity, Cristalinidad, Déchet industriel, Industrial waste, Desperdicio industrial, Déchet plastique, Plastic waste, Residuo plástico, Etude expérimentale, Experimental study, Estudio experimental, Matériau composite, Composite material, Material compuesto, Matériau recyclé, Recycled material, Material reciclado, Matériau renforcé dispersion, Dispersion reinforced material, Material renforzado dispersión, Oléfine polymère, Olefin polymer, Olefina polímero, 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, Recyclage, Recycling, Reconversión, Résistance choc, Impact strength, Resistencia choque, Résistance flexion, Bending strength, Resistencia flexión, Température transition vitreuse, Glass transition temperature, Temperatura transición vítrosa, Traitement surface, Surface treatment, Tratamiento superficie, Mélangeage état fondu, composites, crystallization, and glass transition

Two industrial wastes, fly ash (FA) and recycled polypropylene (RPP) were used to prepare a value-added, sustainable, low cost composite material. Improving the interfacial interaction between the hydrophobic RPP matrix and the hydrophilic FA particles is important to get a good combination of properties. In order to tailor the interface, stearic acid was used as the coupling agent. The FA particles were coated with a saturated fatty acid, stearic acid (SA), in different weight % like 1, 2, 3, and 5. The SA coated fly ash particles were incorporated as filler in RPP matrix composites by melt mixing in 1: 1 weight ratio. The composites were tested for their flexural properties, impact behavior, dynamic mechanical properties, fracture surface analysis, X-ray diffraction (XRD) study, and differential scanning calorimetry (DSC). An increase in flexural modulus and impact strength was observed in the stearic acid coated FA/RPP composites. In 1 wt % SA treated FA/RPP (RFASA1) composites, a significant increase in glass transition temperature was observed along with an increase in crystallinity. A green, renewable, inexpensive chemical like stearic acid was thus found to be an effective coupling agent in fabrication of a composite with 50 wt % filler loading.

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, Appareillage et mise en oeuvre, Machinery and processing, Matières plastiques, Plastics, Revêtement, métallisation, coloration, Coating, metallization, dyeing, Analyse quantitative surface, Quantitative surface analysis, Análisis cuantitativo superficie, Antibactérien, Antibacterial agent, Antibacteriano, Bactéricidie, Bactericidal effect, Bactericidia, Chitosane, Chitosan, Quitosano, Composition chimique, Chemical composition, Composición química, Condensation chimique, Condensation reaction, Condensación química, Copolymère greffé, Graft copolymer, Copolímero injertado, Décharge couronne, Corona effect, Descarga corona, Dérivé du chitosane, Chitosan derivatives, Quitosano derivado, Ethylène polymère, Polyethylene, Etileno polímero, Etude expérimentale, Experimental study, Estudio experimental, Mécanisme réaction, Reaction mechanism, Mecanismo reacción, Oléfine polymère, Olefin polymer, Olefina polímero, Oside polymère, Oside polymer, Osido polímero, Polyélectrolyte, Polyelectrolyte, Polielectrolito, Propriété biologique, Biological properties, Propiedad biológica, Traitement surface, Surface treatment, Tratamiento superficie, Chitosane copolymère greffé, functionalization of polymers, packaging, polyolefins, and polysaccharides

A two-step procedure was applied to obtain antimicrobial films; this procedure involved a corona treatment of the polyethylene (PE) surface and its chemical activation with 1-ethyl-3-[3-dimethylaminopropyl] carbodiimide hydrochloride and N-hydroxysuccinimide, and this led to the covalent bonding of chitosan on the PE surface. Electrochemical methods were used to investigate the stability of the deposited chitosan layer. The potentiometric and polyelectrolyte titrations showed that some amount of chitosan desorbed faster from the surface until equilibrium was reached and also that the grafted chitosan layer was more stable than the physically adsorbed one. The chitosan immobilized on the PE surface exhibited the expected antibacterial activity when tested against three bacteria, which included two Gram-negative bacteria, Salmonella enteritidis and Escherichia coli, and one Gram-positive bacterium, Listeria monocytogenes.

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, Aluminium Hydroxyde, Aluminium Hydroxides, Aluminio Hidróxido, Argile organique, Organic clay, Arcilla orgánica, Carboxylate, Carboxilato, Etude expérimentale, Experimental study, Estudio experimental, Extrusion, Extrusión, Hydroxyde double lamellaire, Layered double hydroxide, Hidróxido doble laminar, Magnésium Hydroxyde, Magnesium Hydroxides, Magnesio Hidróxido, 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, Perte mécanique, Mechanical loss, Pérdida mecánica, Presse extrusion double vis, Double screw extruder, Prensa extrusión doble tornillo, Propriété dynamomécanique, Dynamic mechanical properties, Propiedad dinamomecánica, Propène polymère, Propylene polymer, Propeno polímero, Relation mise en oeuvre propriété, Property processing relationship, Relación puesta en marcha propiedad, Sulfonate, Sulfonato, Traitement surface, Surface treatment, Tratamiento superficie, nanoparicles, nanostructured polymers, nanowires and nanocrystals, and polyolefins

Polypropylene (PP) is the second most widespread commodity polyolefin. Even a small quantity of inorganic component is sufficient to achieve significant improvement of stiffness, strength, thermal stability, biodegradability, etc. The major drawback of inorgano-organic composite materials is insufficient compatibility of the PP matrix with inorganic filler. A suitable choice of the layered double hydroxide-modifying anion opens a possibility to obtain PP-inorganic nanocomposites without a need to use compatibilizers like maleic anhydride grafted PP. The nanocomposites were prepared by melt blending in a twin-screw mini-extruder and characterized by dynamic mechanical thermal analysis, and electron microscopy. Nonpolar PP matrix mix uniformly with clay organophilized with functionalized surfactant acids, giving rise to composites with improved thermo-mechanical properties. Influences of the anionic modifier and the filler content (2 or 5% w/w) on mechanical properties and nanoscale structure of the composites are discussed.

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, Fibres et fils, Fibers and threads, Sciences biologiques et medicales, Biological and medical sciences, Sciences medicales, Medical sciences, Chirurgie (generalites). Transplantations, greffes d'organes et de tissus. Pathologie des greffons, Surgery (general aspects). Transplantations, organ and tissue grafts. Graft diseases, Technologie. Biomatériaux. Equipements, Technology. Biomaterials. Equipments, Arthropoda, Bombycidae, Insecta, Invertebrata, Lepidoptera, Biocompatibilité, Biocompatibility, Biocompatibilidad, Biomatériau, Biomaterial, Bombyx mori, Cicatrisation, Cicatrization, Cicatrización, Copolymère greffé, Graft copolymer, Copolímero injertado, Electrofilage, Electrospinning, Electrohilado, Ether cyclique polymère, Cyclic ether polymer, Eter cíclico polímero, Ethylène oxyde polymère, Ethylene oxide polymer, Etileno óxido polímero, Etude expérimentale, Experimental study, Estudio experimental, Fibre animale, Animal fiber, Fibra animal, Fibre naturelle, Natural fiber, Fibra natural, Fibronectine, Fibronectin, Fibronectina, Fibroïne, Fibroin, Fibroína, In vitro, Morphologie, Morphology, Morfología, Multiplication cellulaire, Cell proliferation, Multiplicación celular, Mélange polymère, Polymer blends, Nanofibre, Nanofiber, Nanofibra, Optimisation, Optimization, Optimización, Plaie, Wound, Herida, Propriété biologique, Biological properties, Propiedad biológica, Protéine animale, Animal protein, Proteína animal, Préparation, Preparation, Preparación, Soie, Silk, Seda, Traitement surface, Surface treatment, Tratamiento superficie, Mat nanofibres, biomaterials, biomedical applications, and biopolymers & renewable polymers

Considering the outstanding biocompatibility of Bombyx mori silk fibroin, this study is designed to fabricate biomimetic nanofibrous structure made of silk fibroin, which can enhance cell activities for tissue formation. The electrospinning of blend of silk fibroin with low molecular weight poly(ethylene-oxide) (PEO) is explored with ease of preparation for high productivities. The average diameter of electrospun silk fibroin (eSF) is decreased from 414 ± 73 to 290 ± 46 nm after PEO extraction. To induce the desired cellular activity, the surface of the eSF fibers is modified with fibronectin by using the carbodiimide chemistry method. The potential use of the obtained wound healing material is assessed by indirect cytotoxicity evaluation on normal human dermal fibroblast (NHDF) in terms of their attachment and cell proliferation. The surface-modified eSF nanofiber mats show good support for cellular adhesion and spreading as a result of fibronectin grafting on the fiber surface, especially for cell migration inside the fibrous structure. These results demonstrate a new fabrication technique of surface-modified silk fibroin electrospun nanofibers for biomedical application; with the ability to accelerate wound healing.

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, Carbure de silicium, Silicon carbide, Silicio carburo, Cellulose, Celulosa, Céramique sans oxyde, Non oxide ceramics, Cerámica sin óxido, Etude expérimentale, Experimental study, Estudio experimental, Hydrolyse, Hydrolysis, Hidrólisis, Matériau composite, Composite material, Material compuesto, Matériau microcristallin, Microcrystalline material, Material microcristalin, Matériau renforcé dispersion, Dispersion reinforced material, Material renforzado dispersión, Nanocristal, Nanocrystal, Procédé sol gel, Sol gel process, Procedimiento sol gel, Propriété mécanique, Mechanical properties, Propiedad mecánica, Préparation, Preparation, Preparación, Résistance choc, Impact strength, Resistencia choque, Résistance traction, Tensile strength, Resistencia tracción, Silane organique, Organic silane, Silano orgánico, Silice, Silica, Sílice, Styrène polymère, Styrene polymer, Estireno polímero, Traitement surface, Surface treatment, Tratamiento superficie, Trichite, Whisker, Triquito, applications, blends, cellulose and other wood products, composites, and polystyrene

A simple approach to fabricate silicon carbide (SiC) whisker is reported via using cellulose nanocrystal (CNC) as templates. The CNC with a length between 2 and 4 μm and a width about 40 nm is prepared by hydrolysis of microcrystalline cellulose (MCC) in strong sulfuric acid condition. The sol-gel reaction of tetraethyl orthosilicate (TEOS) is employed to coat the CNC in the presence of acetic acid as acid catalyst. The SiC whisker is obtained by calcination of CNC/SiO2 hybrid at 1200°C. The obtained SiC whisker is found to have uniform size and shape with a length of ca. 2-4 μm and a width of 40 ± 5 nm. XRD, SEM, TEM (HRTEM), SAED, EDX and FTIR are used to characterize the samples. The obtained SiC whisker is used in polystyrene (PS) resin toughened. And mechanical properties of SiC/PS composites are tested by tensile impact experiments. The test results show that the 5 wt. % SiC whisker particles can disperse homogeneously in the PS resins which use a silane coupling agent (KF9701) as compatibilizer. Our results also show that the SiC whisker is excellent reinforcing material, which the tensile strength of SiC/PS composites attains 110 MPa and the Izod notched impact strength attains 5.00 KJ/m2. Comparing the pure PS resin, the tensile impact of SiC(5)/PS(94.5)/KF9701(0.5) composites can be increased by about 3 times and the Izod notched impact strength can be increased about 8 times.

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. Papiers. Non tissés, Wood. Paper. Non wovens, Papiers, cartons, non tissés, Paper, paperboard, non wovens, Fabrication des papiers et cartons, Paper and paperboard manufacturing, Chitosane, Chitosan, Quitosano, Dimension particule, Particle size, Dimensión partícula, Effet concentration, Concentration effect, Efecto concentración, Etude expérimentale, Experimental study, Estudio experimental, Fabrication, Manufacturing, Fabricación, Mise en pâte, Pulping, Pulpación, Morphologie, Morphology, Morfología, Oside polymère, Oside polymer, Osido polímero, Particule composite, Composite particles, Potentiel électrocinétique, Electrokinetic potential, Potencial electrocinético, Propriété mécanique, Mechanical properties, Propiedad mecánica, Propriété optique, Optical properties, Propiedad óptica, Propriété rhéologique, Rheological properties, Propiedad reológica, Préparation, Preparation, Preparación, Pâte papier, Paper pulp, Pasta papel, Renforcement mécanique, Strengthening, Refuerzo mecánico, Résistance traction, Tensile strength, Resistencia tracción, Talc, Talco, Traitement surface, Surface treatment, Tratamiento superficie, Viscosité, Viscosity, Viscosidad, filler modification, filler retention, high filler content paper, high viscosity chitosan, paper properties, and talc

Chitosan (CS) with different viscosity was investigated as a modifier of talc which was used to improve the strength properties and filler retention in high filler content papers. The particle size and morphology of the resulting modified talc were studied to confirm the successful modification. The zeta potential and coating amount of the CS modified talc were also investigated. It was found that CS viscosity was a critical factor for the filler modification and final paper properties. When high viscosity CS was applied, the resulting tensile strength of filled paper was 64% higher than that of unmodified talc at the filler content of 37% as well as maintained favorable optical properties. Furthermore, with the filler loading of 70% (based on the solid fiber weight), compared with that of unmodified talc, filler retention of modified talc was increased by 39%, while the drainage was little influenced. The field emission scanning electron microscopy images showed a better bonding capacity between modified talc and fibers than that of untreated talc.

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, Fibres et fils, Fibers and threads, Sciences biologiques et medicales, Biological and medical sciences, Sciences medicales, Medical sciences, Chirurgie (generalites). Transplantations, greffes d'organes et de tissus. Pathologie des greffons, Surgery (general aspects). Transplantations, organ and tissue grafts. Graft diseases, Technologie. Biomatériaux. Equipements, Technology. Biomaterials. Equipments, Biomatériau, Biomaterial, Carbonate polymère, Polycarbonate, Carbonato polímero, Copolymère greffé, Graft copolymer, Copolímero injertado, Cristallinité, Crystallinity, Cristalinidad, Electrofilage, Electrospinning, Electrohilado, Etude expérimentale, Experimental study, Estudio experimental, Fibre synthétique, Synthetic fiber, Fibra sintética, Gélatine, Gelatin, Gelatina, Modification chimique, Chemical modification, Modificación química, Morphologie, Morphology, Morfología, Mouillabilité, Wettability, Remojabilidad, Nanofibre, Nanofiber, Nanofibra, Orientation cristalline, Crystal orientation, Orientación cristalina, Orientation fibre, Fiber orientation, Orientación fibra, Plasma froid, Cold plasma, Plasma frío, Polymère aliphatique, Aliphatic polymer, Polímero alifático, Propriété mécanique, Mechanical properties, Propiedad mecánica, Propriété surface, Surface properties, Propiedad superficie, Propriété traction, Tensile property, Propiedad tracción, Protéine animale, Animal protein, Proteína animal, Traitement par plasma, Plasma assisted processing, Traitement surface, Surface treatment, Tratamiento superficie, Mat nanofibres, Tétraméthylène carbonate copolymère, Tétraméthylène carbonate polymère, biomaterials, crystallization, electrospinning, grafting, and mechanical properties

In this study, aligned poly(butylene carbonate) nanofibers were fabricated by electrospinning with a high-speed transfer roller as the receiving device. Cold plasma treatment technology was applied to improve its hydrophilicity and activity to expand its application in biological materials. The morphology of the fibers was investigated with scanning electron microscopy. X-ray diffraction was used to research the impact of the rotation speed on the crystallization and orientation degree of the crystals. The tensile properties of the materials were evaluated by a universal tester. The surface properties of the fibers pretreated by Helium (He) and those grafted with gelatin were evaluated with water contact angle measurement and X-ray photoelectron spectroscopy. The experimental results indicate that the order degree of fibers, crystallinity, and orientation of the crystalline region, including the mechanical properties, all increased correspondingly with the rotation speed. After plasma pretreatment, the hydrophilicity was improved significantly, and the grafting reaction was realized successfully.

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, Additif, Additive, Aditivo, Degré dispersion, Dispersion degree, Grado dispersión, Effet concentration, Concentration effect, Efecto concentración, Ether cyclique polymère, Cyclic ether polymer, Eter cíclico polímero, Ethylène oxyde polymère, Ethylene oxide polymer, Etileno óxido polímero, Etude expérimentale, Experimental study, Estudio experimental, Fumée silice, Silica fume, Humo sílice, 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 Young, Young modulus, Módulo Young, Morphologie, Morphology, Morfología, Mouvement segmentaire, Segmental movement, Movimiento segmentario, Nanocomposite, Nanocompuesto, Plastifiant, Plasticizer, Plastificante, Polymère aliphatique, Aliphatic polymer, Polímero alifático, Polymère greffé, Graft polymers, Propriété mécanique, Mechanical properties, Propiedad mecánica, Propriété optique, Optical properties, Propiedad óptica, Propriété thermique, Thermal properties, Propiedad térmica, Préparation, Preparation, Preparación, Renforcement mécanique, Strengthening, Refuerzo mecánico, Température transition vitreuse, Glass transition temperature, Temperatura transición vítrosa, Traitement surface, Surface treatment, Tratamiento superficie, Transparence, Transparency, Transparencia, biodegradable, composites, and mechanical properties

One commercial type of fumed silica modified with methoxy polyethylene glycol (mPEG) plasticizer was incorporated into polylactic acid (PLA) biobased polymer to improve its performance. The modification on silica was confirmed through Fourier transform infrared spectra, nuclear magnetic resonance, and TGA assessments. The grafting percentage of mPEG onto silica was about 19.8 wt %. Transmission electron microscope revealed a similar degree of dispersion for control silica and modified silica-filled PLA nanocomposites. Not much difference in the glass transition temperatures at various silica contents was found for PLA/control silica systems from the differential scanning calorimetry measurement, but the glass transition temperature of PLA/modified silica nanocomposite at 10 phr of modified silica showed up to 11°C decrement. It was suggested that the mPEG plasticizer efficiently plasticized the PLA matrix through the enhanced segmental mobility of PLA chains. Young's modulus of PLA was about 2133 ± 53 MPa, and the value for the nanocomposite increased to 2547 ± 54 MPa at 10 of phr control silica mainly due to the reinforcing effect from nanoparticles. For modified silica, Young's modulus decreased at various silica contents. The elongation at break for modified silica-filled cases was higher than that of control silica-filled cases. These results were attributed to the plasticizing effect of surface modifier. Optical transmittance for pristine PLA was generally in a similar order as PLA/control silica and modified silica cases at various silica contents. The results agreed with the morphology observation as well.

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, Carbure de silicium, Silicon carbide, Silicio carburo, Conductivité thermique, Thermal conductivity, Conductividad térmica, Constante diélectrique, Permittivity, Constante dieléctrica, Céramique sans oxyde, Non oxide ceramics, Cerámica sin óxido, Effet concentration, Concentration effect, Efecto concentración, Etude expérimentale, Experimental study, Estudio experimental, Matériau composite, Composite material, Material compuesto, Morphologie, Morphology, Morfología, Nanocomposite, Nanocompuesto, Propriété diélectrique, Dielectric properties, Propiedad dieléctrica, Propriété mécanique, Mechanical properties, Propiedad mecánica, Propriété thermique, Thermal properties, Propiedad térmica, Propriété traction, Tensile property, Propiedad tracción, Préparation, Preparation, Preparación, Résistance traction, Tensile strength, Resistencia tracción, Stabilité thermique, Thermal stability, Estabilidad térmica, Styrène polymère, Styrene polymer, Estireno polímero, Traitement surface, Surface treatment, Tratamiento superficie, composites, dielectric properties, polystyrene, surfaces and interfaces, and thermal properties

A simple method is reported to coat silicon carbide (SiC) nanoparticles with polystyrene (PS) to improve the interfacial adhesion between polymer matrix and SiC nanoparticles. The morphology of untreated SiC nanoparticles, PS coated SiC (p-SiC) nanoparticles, SiC/PS nanocomposites, and p-SiC/PS nanocomposites are observed. The HRTEM image of p-SiC shows that the thickness of PS on the surface of SiC is about 1.5-2.0 nm, which is consistent with the TGA results. With 24.7 vol % untreated SiC nanoparticles dispersed into PS matrix, the thermal conductivity (λ) of the SiC/PS composites increases by about 192%. However, when the same volume fraction of p-SiC nanoparticles is used, the increase is about 353%. This big difference could be attributed to the promoted dispersion of the p-SiC in the PS matrix. The measurements of glass transition (Tg), dielectric constant (ε), and tensile strength at break (σb) also support this explanation.

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, Bambou, Bamboo, Etude expérimentale, Experimental study, Estudio experimental, Fibre naturelle, Natural fiber, Fibra natural, Fibre végétale, Plant fiber, Fibra vegetal, Matériau composite, Composite material, Material compuesto, Matériau renforcé fibre, Fiber reinforced material, Material reforzado fibra, Méthacrylate d'alkyle polymère, Alkyl methacrylate polymer, Metacrilato de alquilo polímero, Oléfine polymère, Olefin polymer, Olefina polímero, Polymère greffé, Graft polymers, Polymérisation radicalaire, Free radical polymerization, Polimerización radicalar, Propriété mécanique, Mechanical properties, Propiedad mecánica, Propriété traction, Tensile property, Propiedad tracción, Propène polymère, Propylene polymer, Propeno polímero, Préparation, Preparation, Preparación, Relation mise en oeuvre propriété, Property processing relationship, Relación puesta en marcha propiedad, Résistance choc, Impact strength, Resistencia choque, Traitement surface, Surface treatment, Tratamiento superficie, Méthacrylate de dodécyle polymère, composites, fibers, grafting, and polyolefins

In this study, lauryl methacrylate grafted onto bamboo fibers (BF-g-LM) was prepared to improve the interfacial compatibility between hydrophilic bamboo fibers (BFs) and hydrophobic plastic. The lauryl methacrylate (LM) was initiated by benzoxyl peroxide (BPO) and grafted onto BFs via a free-radical chain-transfer reaction. LM was grafted onto BFs with ether bonds, and differential scanning calorimetry indicated that the ether pyrolysis of BF-g-LM occurred at 280°C. The optimum preparation conditions were obtained as follows: 0.30 g of pretreated bamboo flour was immersed in 0.225 mol/L LM. The reaction was then initiated by 0.025 mol/L BPO, and this reaction was sustained for 4 h at 80°C. BF-g-LM served as coupling agent between the BFs and the polypropylene (PP) matrix, as shown by scanning electron microscopy analysis. The elongation at break of the BF/PP composites with BF-g-LM increased to two times compared to that of the BF/PP composites without BF-g-LM. The impact strength and maximum deflection also increased to 75 and 580%, respectively. In conclusion, BF-g-LM is a promising coupling agent that can be used in BF-reinforced thermoplastic 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, Acrylique dérivé polymère, Acrylic polymer, Acrilico derivado polímero, Agent accrochage, Coupling agent, Agente enganche, Argile, Clay, Arcilla, Conductivité électrique, Electrical conductivity, Conductividad eléctrica, Dimension pore, Pore size, Dimensión poro, Etude expérimentale, Experimental study, Estudio experimental, Matériau composite, Composite material, Material compuesto, Matériau poreux, Porous material, Material poroso, Matériau revêtement, Coating material, Material revestimiento, Morphologie, Morphology, Morfología, Palygorskite, Palygorskita, Polymère aromatique, Aromatic polymer, Polímero aromático, Polymère conducteur, Conducting polymers, Polymérisation oxydante, Oxidative polymerization, Polimerizacion oxidante, Porosité, Porosity, Porosidad, Propriété électrique, Electrical properties, Propiedad eléctrica, Préparation, Preparation, Preparación, Silane organique, Organic silane, Silano orgánico, Thiophène polymère, Thiophene polymer, Tiofeno polímero, Traitement surface, Surface treatment, Tratamiento superficie, coatings, conductivity, palygorskite, polythiophene, and porosity

Modified palygorskite-polythiophene (MPA-PTh) composites were prepared by chemical oxidative polymerization of palygorskite (PA) nucleartor with thiophene (Th) after the surface modification with γ-(2,3-epoxypropoxy) propytrimethoxysilane (KH-560). The MPA-PTh composites were doped in iodine vapor to create the porous palygorskite-polythiophene (PMPA-PTh) conductive composites. Fourier transform infrared spectra (FTIR), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), N2 adsorption-desorption isotherms using the Brunauer-Emmett-Teller method (BET) and electrochemical impedance spectrum (EIS) techniques were applied to characterize the modified PA and the prepared composites. According to FTIR and XPS, the KH-560 was bound to the PA surface and the iodine ion (I3- and I5-) entered the PTh molecular chains. XRD, SEM, TEM, BET, and EIS analysis confirmed that the doping of iodine not only transform the core-shell MPA-PTh into the PMPA-PTh but also improve the electrical conductivity of composites. The PMPA-PTh composites were fabricated that yield a volume resistivity of ∼2.44 × 102 Ω cm and a internal resistances of ∼100 Ω, and their BET surface area, BJH (Barrett-Joiner-Halenda) average pore size and BJH cumulative pore volume were improved in comparison with those of the MPA-PTh composites. SEM images showed that the PMPA-PTh composites could form consecutive space network and the PMPA-PTh composites acrylic coating films had advisable conductivity.

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, Amide 12 polymère, Amide 12 polymer, Amida 12 polímero, Argile organique, Organic clay, Arcilla orgánica, Argile, Clay, Arcilla, Composé de l'ammonium quaternaire, Quaternary ammonium compound, Amonio cuaternario compuesto, Etude expérimentale, Experimental study, Estudio experimental, Extrusion, Extrusión, Injection eau, Water injection, Inyección agua, Matériau composite, Composite material, Material compuesto, Matériau renforcé dispersion, Dispersion reinforced material, Material renforzado dispersión, Module élasticité, Elastic modulus, Módulo elasticidad, Montmorillonite, Montmorilonita, Morphologie, Morphology, Morfología, Nanocomposite, Nanocompuesto, Polymère aliphatique, Aliphatic polymer, Polímero alifático, Propriété mécanique, Mechanical properties, Propiedad mecánica, Propriété traction, Tensile property, Propiedad tracción, Traitement surface, Surface treatment, Tratamiento superficie, Extrusion assistée eau, clay, composites, and extrusion

This work aims at comparing the efficiency of three melt compounding methods for preparing polyamide 12 (PA12)/ untreated clay composites. Conventional extrusion was compared with two water-assisted extrusion methods previously described in the literature and respectively involving injection of water in the polymer/clay stream or injection of aqueous clay slurry in the polymer stream. The dispersion of the clay in the composites was analyzed at the microscale and at the nanoscale using microscopy (optical and electronic) and wide angle X-ray diffraction (WAXD). The tensile properties of the composites were evaluated. The results showed that injection of aqueous clay slurry in the polymer stream was the most efficient method for preparing PA12/untreated clay composites, although clay particles remained mainly dispersed at the microscale. This method allowed for a drastic size reduction of the microparticles, accompanied by enhancements of ca. +10 % in tensile modulus and tensile strength (compared with equivalent composites obtained by conventional extrusion). The influence of the pH of the aqueous clay slurry was also investigated: neutralization of the clay slurry generated finer dispersions, probably resulting from a better pre-exfoliation of the clay in the water medium. PA12/organophilic clay composites were also prepared as control samples. When an adequate surface treatment was selected, nanoscale dispersion of the clay platelets was easily achieved. In this case, composites prepared by conventional extrusion showed overall similar properties as their equivalents prepared using injection of water in the polymer/clay stream.

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, Clay, Arcilla, Carboxylate, Carboxilato, Cristallinité, Crystallinity, Cristalinidad, Ester polymère, Ester polymer, Ester polímero, Etude expérimentale, Experimental study, Estudio experimental, Hydroxyde double lamellaire, Layered double hydroxide, Hidróxido doble laminar, Matériau composite, Composite material, Material compuesto, Matériau renforcé dispersion, Dispersion reinforced material, Material renforzado dispersión, Nanocomposite, Nanocompuesto, Polycondensation, Condensation polymerization, Policondensación, Polymère aliphatique, Aliphatic polymer, Polímero alifático, Propriété dynamomécanique, Dynamic mechanical properties, Propiedad dinamomecánica, Propriété rhéologique, Rheological properties, Propiedad reológica, Propriété thermique, Thermal properties, Propiedad térmica, Relation mise en oeuvre propriété, Property processing relationship, Relación puesta en marcha propiedad, Relation mise en oeuvre structure, Structure processing relationship, Relación puesta en marcha estructura, Renforcement mécanique, Strengthening, Refuerzo mecánico, Stabilité thermique, Thermal stability, Estabilidad térmica, Stéarate, Stearate, Estearato, Succinate polymère, Polysuccinate, Succinato polímero, Sulfate, Sulfates, Sulfato, Traitement surface, Surface treatment, Tratamiento superficie, Viscosité, Viscosity, Viscosidad, Butène succinate polymère, biopolymers and renewable polymers, nanoparticles, nanowires and nanocrystals, and properties and characterization

A series of poly(butylene succinate) (PBS) containing organo-modified layered double hydroxide (LDH) are prepared by melt compounding and by in situ polymerization of succinic ester and 1,4-butanediol. Various LDHs intercalated with renewable organic anions are used. More specifically, lauryl sulfate, stearate, succinate, adipate, sebacate, citrate, and ricinoleate ions are used as LDHs organo-modifiers. The thermal, rheological, and dynamic mechanical properties of the samples are investigated. The results reveal a general mechanical reinforcement imparted by the clays. Significant changes are observed for the in situ polymerized nanocomposites, especially for LDH stearate which improves the properties of PBS nanostructure, whereas very few differences are observed for the other samples.

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, Degré dispersion, Dispersion degree, Grado dispersión, Diacide carboxylique, Dicarboxylic acid, Diácido carboxílico, Epoxyde résine, Epoxy resin, Epóxido resina, Etude expérimentale, Experimental study, Estudio experimental, Interaction matière charge polymère, Polymer filler interaction, Interacción materia carga polímero, Matériau composite, Composite material, Material compuesto, Matériau renforcé dispersion, Dispersion reinforced material, Material renforzado dispersión, Morphologie, Morphology, Morfología, Nanocomposite, Nanocompuesto, Nanotube carbone, Carbon nanotubes, Nanotube multifeuillets, Multiwalled nanotube, Phosphine organique, Organic phosphine, Fosfina orgánica, Propriété thermique, Thermal properties, Propiedad térmica, Propriété traction, Tensile property, Propiedad tracción, Traitement surface, Surface treatment, Tratamiento superficie, composites, graphene and fullerenes, mechanical properties, nanotubes, and thermal properties

We describe a simple and novel method for dispersing multiwalled carbon nanotubes (MWCNTs) in a flexible epoxy matrix. The MWCNTs were modified with half-neutralized dicarboxylic acids having different numbers of carbon atoms. The modified MWCNTs were prereacted with epoxy in the presence of triphenylphosphine. The dispersion of the MWCNTs and the enhancement in the tensile properties were found to be better for composites prepared with a solvent. Among the half-neutralized dicarboxylic acids used, half-neutralized adipic acid (HNAA) exhibited the best performance. Scanning electron microscopy and transmission electron microscopy studies clearly indicated an improvement in the level of dispersion of the MWCNTs with the addition of the modifier. The good dispersion of the MWCNTs and the resulting improvement in their properties were attributed to the cation―π interactions (the cation of HNAA and the π-electron clouds of the MWCNTs) between the HNAA and MWCNTs and the chemical bonding of —COOH groups of HNAA and the epoxy resin. The cation―π interaction and chemical bonding was assessed with Fourier transform infrared spectroscopy and Raman spectroscopy. This approach did not destroy the π―electron clouds of the MWCNTs in contrast to a chemical functionalization strategy.

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, Constante diélectrique, Permittivity, Constante dieléctrica, Cristallisation, Crystallization, Cristalización, Effet concentration, Concentration effect, Efecto concentración, Etude expérimentale, Experimental study, Estudio experimental, Matériau composite, Composite material, Material compuesto, Morphologie, Morphology, Morfología, Nanotube carbone, Carbon nanotubes, Nanotube multifeuillets, Multiwalled nanotube, Nickel, Niquel, Particule métallique, Metal particle, Partícula metálica, Pressage chaud, Hot pressing, Prensado caliente, Propriété diélectrique, Dielectric properties, Propiedad dieléctrica, Traitement surface, Surface treatment, Tratamiento superficie, Vinylidène fluorure polymère, Vinylidene fluoride polymer, Vinilideno fluoruro polímero, composites, dielectric permittivity, nanotubes, nickel-multiwalled carbon nanotubes, and properties and characterization

Composites with nickel particles coated multiwalled carbon nanotubes (Ni-MWNTs) embedded into polyvinylidene fluoride (PVDF) were prepared by solution blending and hot-press processing. The morphology, structure, crystallization behavior, and dielectric properties of composites were studied. The results showed that the crystallization of PVDF was affected by Ni-MWNTs. With the increment of Ni-MWNTs, the content of β-phase in PVDF increased. The dielectric permittivity was as high as 290 at 103 Hz when the weight fraction of Ni-MWNTs was 10%. The results can be explained by the space charge polarization at the interfaces between the insulator and the conductor, and the formation of microcapacitance structure.