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Chemical industry parachemical industry, Industrie chimique et parachimique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, 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, Agent accrochage, Coupling agent, Agente enganche, Composite hybride, Hybrid composite, Compuesto híbrido, Copolymère greffé, Graft copolymer, Copolímero injertado, Epoxyde résine, Epoxy resin, Epóxido resina, Etude expérimentale, Experimental study, Estudio experimental, Fibre minérale, Mineral fiber, Fibra inorgánica, Matériau composite, Composite material, Material compuesto, Matériau renforcé fibre, Fiber reinforced material, Material reforzado fibra, Mode rupture, Fracture mode, Modo ruptura, Moulage injection, Injection molding, Moldeo por inyección, Nanocomposite, Nanocompuesto, Nanotube carbone, Carbon nanotubes, Propriété mécanique, Mechanical properties, Propiedad mecánica, Silane organique, Organic silane, Silano orgánico, Stratifié, Laminate, Estratificado, Tissu textile, Woven material, Tela textil, Tissu verre, Glass fiber fabric, Tela vidrio, Traitement surface, Surface treatment, Tratamiento superficie, Ténacité, Fracture toughness, Tenacidad, Nanotubes carbone greffés, Ténacité interlaminaire, A. Laminates, B. Fracture toughness, D. Electron microscopy, and E. Injection moulding

A novel and simple chemical route was successfully applied to graft carbon nanotubes (CNTs) onto silanized plain weave glass fabric (PWGF) mats, as confirmed by Fourier transform infrared spectroscopy and scanning electron microscopy. The CNTs grafted PWGF mats were used to reinforce epoxy matrix for multi-scale composite production due to their potential for increasing interlaminar fracture toughness by bridging the ply interfaces. Grafting CNTs onto PWGFs improved both initial and steady-state toughness more than double as measured by Mode I interlaminar fracture testing. Failed specimens were visualized to determine the failure modes using fractography. The key findings indicated that the covalent interactions created between CNTs and fibers lead fibers bridging the interface region like barbed wires, which are mainly responsible for increased fracture toughness as a result of improved interfacial adhesion.

Chemical industry parachemical industry, Industrie chimique et parachimique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, 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, Epoxyde résine, Epoxy resin, Epóxido resina, Etude expérimentale, Experimental study, Estudio experimental, Matériau composite, Composite material, Material compuesto, Matériau renforcé dispersion, Dispersion reinforced material, Material renforzado dispersión, Module Young, Young modulus, Módulo Young, Morphologie, Morphology, Morfología, Mélange maître, Masterbatch, Mezcla maestra, Nanotube carbone, Carbon nanotubes, Propriété mécanique, Mechanical properties, Propiedad mecánica, Propriété thermique, Thermal properties, Propiedad térmica, Résistance flexion, Bending strength, Resistencia flexión, Résistance traction, Tensile strength, Resistencia tracción, Température transition vitreuse, Glass transition temperature, Temperatura transición vítrosa, Traitement surface, Surface treatment, Tratamiento superficie, A. Theromosetting resin, B. Mechanical properties, B. Thermal properties, and D. Mechanical testing

In this study, the mechanical and thermal properties of epoxy composites using two different forms of carbon nanotubes (powder and masterbatch) were investigated. Composites were prepared by loading the surface-modified CNT powder and/or CNT masterbatch into either ductile or brittle epoxy matrices. The results show that 3 wt.% CNT masterbatch enhances Young's modulus by 20%, tensile strength by 30%, flexural strength by 15%, and 21.1 °C increment in the glass transition temperature (by 34%) of ductile epoxy matrix. From scanning electron microscopy images, it was observed that the CNT masterbatch was uniformly distributed indicating the pre-dispersed CNTs in the masterbatch allow an easier path for preparation of CNT-epoxy composites with reduced agglomeration of CNTs. These results demonstrate a good CNT dispersion and ductility of epoxy matrix play a key role to achieve high performance CNT-epoxy composites.

Chemical industry parachemical industry, Industrie chimique et parachimique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, 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, Biodégradabilité, Biodegradability, Biodegradabilidad, Cristallisation, Crystallization, Cristalización, Effet concentration, Concentration effect, Efecto concentración, Etude expérimentale, Experimental study, Estudio experimental, Fibre coco, Coconut fiber, Fibra coco, Fibre naturelle, Natural fiber, Fibra natural, Fibre végétale, Plant fiber, Fibra vegetal, Lactique acide polymère, Lactic acid polymer, Láctico ácido polímero, Matériau composite, Composite material, Material compuesto, Matériau renforcé fibre, Fiber reinforced material, Material reforzado fibra, Mercerisation, Mercerization, Mercerización, Morphologie, Morphology, Morfología, 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, Résistance flexion, Bending strength, Resistencia flexión, Sol, Soils, Suelo, Stabilité thermique, Thermal stability, Estabilidad térmica, Stratifié, Laminate, Estratificado, Traitement surface, Surface treatment, Tratamiento superficie, Biocomposite, Cristallisation froide, A. Fibres, A. Polymer-matrix composites (PMCs), B. Mechanical properties, and B. Thermal properties

The effects of fibre content (5-30 wt%) and fibre treatment on surface morphology, tensile, flexural, thermal and biodegradable properties of polylactic acid (PLA)/coir fibre biocomposites were evaluated via scanning electron microscopy (SEM), mechanical testing, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and soil burial method. Similar decreasing trends were found for tensile and flexural strengths with higher strength values obtained for PLA/treated coir fibre biocomposites. 20 wt% treated coir fibres were determined to achieve optimum tensile and flexural strengths of biocomposites. Regardless of fibre treatment, the thermal stability of biocomposites is worsened with increasing the fibre content. The decreased cold crystallisation temperatures of biocomposites further confirms the effective nucleating agent role of coir fibres. The biocomposites undergo much faster degradation than PLA, with the maximum weight loss of 34.9% in treated fibre biocomposites relative to 18% in PLA after 18-day burial, arising from the hydrophilic nature of coir fibres.

Chemical industry parachemical industry, Industrie chimique et parachimique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, 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, Absorption eau, Water absorption, Absorción agua, Chanvre, Hemp, Cáñamo, Cristallinité, Crystallinity, Cristalinidad, Etude expérimentale, Experimental study, Estudio experimental, Fibre naturelle, Natural fiber, Fibra natural, Fibre synthétique, Synthetic fiber, Fibra sintética, Fibre végétale, Plant fiber, Fibra vegetal, Lactique acide polymère, Lactic acid polymer, Láctico ácido polímero, Matériau composite, Composite material, Material compuesto, Matériau fibre unidirectionnelle, Unidirectional fiber material, Material fibra unidireccional, Matériau renforcé fibre, Fiber reinforced material, Material reforzado fibra, Mercerisation, Mercerization, Mercerización, Moulage compression, Compression molding, Moldeo por compresión, Orientation fibre, Fiber orientation, Orientación fibra, Polymère aliphatique, Aliphatic polymer, Polímero alifático, Porosité, Porosity, Porosidad, Propriété mécanique, Mechanical properties, Propiedad mecánica, Propriété rhéologique, Rheological properties, Propiedad reológica, Propriété thermique, Thermal properties, Propiedad térmica, Résistance choc, Impact strength, Resistencia choque, Résistance flexion, Bending strength, Resistencia flexión, Résistance traction, Tensile strength, Resistencia tracción, Stratifié, Laminate, Estratificado, Traitement surface, Surface treatment, Tratamiento superficie, Viscoélasticité, Viscoelasticity, Viscoelasticidad, Biocomposite, A. Fabrics/textiles, B. Mechanical properties, B. Porosity, and E. Compression moulding

This paper examines the thermal and mechanical behaviour as well as moisture absorption of aligned hemp composites using hemp/PLA wrap spun yarns. Uniaxial composites were fabricated with 30 mass% hemp using compression moulding. The properties of composites in terms of hemp fibre orientation (aligned and random), off-axis angle and alkali treatment were investigated. It was found that the testing direction influenced the mechanical properties of the composites. Compared with all the fabricated composites, the aligned alkali hemp/PLA yarn composite possessed the best mechanical properties, including tensile, flexural and impact strengths, lower porosity and water absorption. The water absorption for all composites was higher than for neat PLA, both at room temperature and 80 °C. The PLA in its treated composites had higher crystallinity, which was attributed to effective heterogeneous nucleation induced by hemp. Based on SEM observation and theoretical analysis of DMTA data, there was a favourable interfacial adhesion in all composites.

Chemical industry parachemical industry, Industrie chimique et parachimique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, 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, Epoxyde résine, Epoxy resin, Epóxido resina, Etude expérimentale, Experimental study, Estudio experimental, Matériau composite, Composite material, Material compuesto, Matériau renforcé dispersion, Dispersion reinforced material, Material renforzado dispersión, Mode rupture, Fracture mode, Modo ruptura, Module conservation, Storage modulus, Módulo conservación, Morphologie, Morphology, Morfología, Propriété mécanique, Mechanical properties, Propiedad mecánica, Propriété rhéologique, Rheological properties, Propiedad reológica, Propriété thermique, Thermal properties, Propiedad térmica, Propriété traction, Tensile property, Propiedad tracción, Résistance flexion, Bending strength, Resistencia flexión, Silane organique, Organic silane, Silano orgánico, Stabilité thermique, Thermal stability, Estabilidad térmica, Température transition vitreuse, Glass transition temperature, Temperatura transición vítrosa, Traitement surface, Surface treatment, Tratamiento superficie, Ténacité, Fracture toughness, Tenacidad, Graphène fonctionnalisé, Graphène oxyde, A. Polymer-matrix composites (PMCs), B. Mechanical properties, B. Microstructures, and E. Surface treatments

In this work, the effects of as-produced GO and silane functionalized GO (silane-f-GO) loading and silane functionalization on the mechanical properties of epoxy composites are investigated and compared. Such silane functionalization containing epoxy ended-groups is found to effectively improve the compatibility between the silane-f-GO and the epoxy matrix. Increased storage modulus, glass transition temperature, thermal stability, tensile and flexural properties and fracture toughness of epoxy composites filled with the silane-f-GO sheets are observed compared with those of the neat epoxy and GO/epoxy composites. These findings confirm the improved dispersion and interfacial interaction in the composites arising from covalent bonds between the silane-f-GO and the epoxy matrix. Moreover, several possible fracture mechanisms, i.e. crack pinning/deflection, crack bridging, and matrix plastic deformation initiated by the debonding/delamination of GO sheets, were identified and evaluated.

Chemical industry parachemical industry, Industrie chimique et parachimique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, 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 substituant, Substituent effect, Efecto sustituyente, Epoxyde résine, Epoxy resin, Epóxido resina, Etude expérimentale, Experimental study, Estudio experimental, Fibre minérale, Mineral fiber, Fibra inorgánica, Fibre verre, Glass fiber, Fibra vidrio, Interface fibre matrice, Matrix fiber interface, Interfase fibra matriz, Matériau composite, Composite material, Material compuesto, Matériau renforcé fibre, Fiber reinforced material, Material reforzado fibra, Mode rupture, Fracture mode, Modo ruptura, Morphologie, Morphology, Morfología, Mouillabilité, Wettability, Remojabilidad, Propriété interface, Interface properties, Propiedad interfase, Propriété mécanique, Mechanical properties, Propiedad mecánica, Propriété surface, Surface properties, Propiedad superficie, Résistance cisaillement, Shear strength, Resistencia cizallamiento, Silane organique, Organic silane, Silano orgánico, Traitement surface, Surface treatment, Tratamiento superficie, Résistance cisaillement interfacial, A. Interface/interphase, B. Silane coupling agent, C. Film former, and D. Surface morphology

A series of fiber sizing formulations have been chosen to compare the effect of silane coupling agent and film former on the properties of glass fiber/epoxy interphase. The microdroplet debond test was chosen to measure the strength and energy absorption of the interphases. Results indicate that chemical reactivity and wettability of polymeric film former influence the strength and energy absorption for glass fiber/ epoxy interphases. Comparison of amino silane sizings with different film formers show that the azamide-based film former provided a 47% increase in interfacial shear strength over other sizings studied. The results demonstrate that the relative reactivity and wettability of film former can enhance both chemical bond formation and fiber surface roughness. Changes in fiber surface morphology due to application of sizing were observed by Atomic Force Microscopy (AFM). Analysis of failed surfaces indicate that both silane and film former components affect the mode of failure at the interface.

Chemical industry parachemical industry, Industrie chimique et parachimique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, 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, Absorption eau, Water absorption, Absorción agua, Agent accrochage, Coupling agent, Agente enganche, Anhydride organique, Organic anhydride, Anhídrido orgánico, Bois feuillu, Hardwood, Madera de frondosas, Composite plastique bois, Wood-plastic composites, Déchet bois, Wood waste, Desperdicio madera, Ethylène haute densité polymère, High density ethylene polymer, Etileno alta densidad polímero, Etude expérimentale, Experimental study, Estudio experimental, Hêtre, Beech trees, Matériau composite, Composite material, Material compuesto, Matériau renforcé dispersion, Dispersion reinforced material, Material renforzado dispersión, Matériau renforcé fibre, Fiber reinforced material, Material reforzado fibra, Module élasticité, Elastic modulus, Módulo elasticidad, Moulage injection, Injection molding, Moldeo por inyección, Oléfine polymère, Olefin polymer, Olefina polímero, Polymère fonctionnel, Functional polymer, Polímero funcional, Propriété mécanique, Mechanical properties, Propiedad mecánica, Pâte thermomécanique, Thermomechanical pulp, Pasta termomecánica, Relation mise en oeuvre propriété, Property processing relationship, Relación puesta en marcha propiedad, Résistance flexion, Bending strength, Resistencia flexión, Traitement surface, Surface treatment, Tratamiento superficie, Farine bois, Fibre pâte papier, Longueur fibre, Module flexion, A. Fibres, A. Thermoplastic resin, A. Wood, and B. Mechanical properties

Thermo-mechanical pulp (TMP) fibres made from beech wood were produced using increasing refiner gap widths and thus with increasing fibre length and coarseness. Fibres (60% by weight) were compounded in an internal kneading mixer using high-density polyethylene as the matrix and injection-moulded. Fibre lengths and length/width ratios were determined (a) before processing and (b) after injection-moulding and Soxhlet extraction using the optical FibreShape system. An increase in fibre length resulted in a decrease in water absorption and an improvement in flexural strength and modulus of elasticity of the wood-plastic composites (WPC). However, flexural strength of the WPC with TMP fibres was not improved compared to WPC with wood flour when maleic anhydride-grafted polyethylene (MAPE) was used as a coupling agent. After injection-moulding, differences in length of the various TMP fibre types were minor. Fibre geometry before processing strongly influences the water absorption and flexural properties of the composite. Fibre treatment with emulsified methylene diphenyl diisocyanate (EMDI) resin before compounding was shown to be equally efficient in reducing water absorption and improving flexural strength as the addition of MAPE during the compounding step.

Chemical industry parachemical industry, Industrie chimique et parachimique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, 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, Amine primaire, Primary amine, Amina primaria, Dépôt plasma, Plasma deposition, Depósito plasma, Effet concentration, Concentration effect, Efecto concentración, Epoxyde résine, Epoxy resin, Epóxido resina, Etude expérimentale, Experimental study, Estudio experimental, Matériau composite, Composite material, Material compuesto, Matériau renforcé dispersion, Dispersion reinforced material, Material renforzado dispersión, Nanocomposite, Nanocompuesto, Nanotube carbone, Carbon nanotubes, Nanotube multifeuillets, Multiwalled nanotube, Polymérisation décharge électrique, Glow discharge polymerization, Polimerización descarga eléctrica, Propriété mécanique, Mechanical properties, Propiedad mecánica, Propriété thermique, Thermal properties, Propiedad térmica, Renforcement mécanique, Strengthening, Refuerzo mecánico, Résistance flexion, Bending strength, Resistencia flexión, Traitement par plasma, Plasma assisted processing, Traitement surface, Surface treatment, Tratamiento superficie, Module flexion, A. Particle-reinforcement, B. Mechanical properties, and E. Surface treatments

Uniform treatment of multiwalled carbon nanotubes by plasma treatment has been investigated using a custom-built stirring plasma system. A thin plasma polymer with high levels of amine groups has been deposited on MWCNTs using a combination of continuous wave and pulsed plasma polymerization of heptylamine in the stirring plasma system. Scanning electron microscopy showed that the plasma polymerization improved the dispersion and interfacial bonding of the MWCNTs with an epoxy resin at loadings of 0.1, 0.3 and 0.5 wt%. The flexural and thermal mechanical properties of plasma polymerized MWCNT/epoxy nanocomposites were also significantly improved while untreated MWCNT/epoxy nanocomposites showed an opposite trend. The epoxy with 0.5 wt% plasma polymerized MWCNTs had the greatest increase in flexural properties, with the flexural modulus, flexural strength and toughness increasing by about 22%, 17% and 70%, respectively.

Chemical industry parachemical industry, Industrie chimique et parachimique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, 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, Contrainte résiduelle, Residual stress, Tensión residual, Contrainte thermique, Thermal stress, Tensión térmica, Epoxyde résine, Epoxy resin, Epóxido resina, Etude théorique, Theoretical study, Estudio teórico, Fibre minérale, Mineral fiber, Fibra inorgánica, Fibre verre, Glass fiber, Fibra vidrio, Interface fibre matrice, Matrix fiber interface, Interfase fibra matriz, Matériau composite, Composite material, Material compuesto, Mode rupture, Fracture mode, Modo ruptura, Modélisation, Modeling, Modelización, Méthode élément fini, Finite element method, Método elemento finito, Propriété interface, Interface properties, Propiedad interfase, Propriété mécanique, Mechanical properties, Propiedad mecánica, Propriété traction, Tensile property, Propiedad tracción, Résistance cisaillement, Shear strength, Resistencia cizallamiento, Silane organique, Organic silane, Silano orgánico, Simulation numérique, Numerical simulation, Simulación numérica, Traitement surface, Surface treatment, Tratamiento superficie, Modèle zone cohésive, Résistance cisaillement interfacial, B. Fiber/matrix bond, B. Fracture, B. Interface/interphase, and C. Finite element analysis (FEA)

This paper presents a finite element (FE) modeling methodology to simulate and assess the importance of various factors affecting the failure mechanisms in the microdroplet test used to measure the interface shear strength (IFSS) of S-glass fiber epoxy matrix. These factors include the effect of processing-induced residual thermal stresses, progressive debonding with interfacial friction, unstable crack propagation and frictional fiber sliding on mixed-mode loading at the interface. Cohesive zone modeling approach is employed to simulate the crack propagation and interfacial failure. Mode II dominated traction separation laws are determined through numerical simulations of microdroplet test results. The importance of including the effect of residual stresses and interfacial friction in determining the cohesive traction-separation laws is illustrated. The sensitivity of the results for mode I traction―separation parameters is studied. The developed holistic modeling methodology allows for accurate determination of traction―separation behavior of the interface. This modeling effort also attempts to identify improvements to the microdroplet test method which is widely used to assess the degree of fiber/matrix adhesion.

Chemical industry parachemical industry, Industrie chimique et parachimique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, 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, Céréale, Cereal, Blé, Wheat, Trigo, Etude expérimentale, Experimental study, Estudio experimental, Fibre coco, Coconut fiber, Fibra coco, Fibre naturelle, Natural fiber, Fibra natural, Fibre végétale, Plant fiber, Fibra vegetal, Gluten, Matériau composite, Composite material, Material compuesto, Mercerisation, Mercerization, Mercerización, Mode rupture, Fracture mode, Modo ruptura, Propriété mécanique, Mechanical properties, Propiedad mecánica, Protéine végétale, Plant protein, Proteína vegetal, Relation mise en oeuvre propriété, Property processing relationship, Relación puesta en marcha propiedad, Renforcement mécanique, Strengthening, Refuerzo mecánico, Résistance flexion, Bending strength, Resistencia flexión, Silane organique, Organic silane, Silano orgánico, Traitement surface, Surface treatment, Tratamiento superficie, Biocomposite, A. Polymer matrix composite, B. Interface/interphase, and C. Mechanical properties

The aim of the present work is to fabricate a biodegradable composite with improved mechanical properties and high work to failure by combining toughened wheat gluten matrix with 15 mass% surface treated, highly ductile coconut fiber. Matrix cracking at a flexural stress of 46 MPa in wheat gluten was delayed until nearly 71 MPa in the composite, with ultimate stress greater than 105 MPa. Flexural stiffness was improved from roughly 4 GPa in the wheat gluten to 5.4 GPa in the composite. The work to failure was improved from 0.26 MJ/m3 in wheat gluten to 1.45 MJ/m3 with the toughened wheat gluten, and finally to 4.94 MJ/m3 for the composite. The toughening additive for the wheat gluten was shown to erase aging effects in the wheat gluten but also appeared to change the interfacial characteristics.

Chemical industry parachemical industry, Industrie chimique et parachimique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, 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, Alcool polymère, Alcohol polymer, Alcohol polímero, Amortissement vibration, Vibration damping, Amortiguación vibración, Epoxyde résine, Epoxy resin, Epóxido resina, Ether polymère, Ether polymer, Eter polímero, Etude expérimentale, Experimental study, Estudio experimental, Fibre aramide, Aramid fiber, Fibra aramida, Fibre carbone, Carbon fiber, Fibra carbón, Fibre lin, Flax fiber, Fibra lino, Fibre minérale, Mineral fiber, Fibra inorgánica, Fibre naturelle, Natural fiber, Fibra natural, Fibre synthétique, Synthetic fiber, Fibra sintética, Fibre végétale, Plant fiber, Fibra vegetal, Glycérol, Glycerol, Glicerol, Liaison hydrogène, Hydrogen bond, Enlace hidrógeno, Matériau composite, Composite material, Material compuesto, Matériau renforcé fibre, Fiber reinforced material, Material reforzado fibra, Moulage compression, Compression molding, Moldeo por compresión, Polymère aliphatique, Aliphatic polymer, Polímero alifático, Propriété dynamomécanique, Dynamic mechanical properties, Propiedad dinamomecánica, Stratifié, Laminate, Estratificado, Tissu textile, Woven material, Tela textil, Traitement surface, Surface treatment, Tratamiento superficie, Glycérol polymère, A. Fabrics/textiles, B. Vibration, E. Compression moulding, and Flax

In the present work, the addition of glycerol and polyglycerol was found to increase the damping coefficient of flax composites by 10―13% and 21―25%, respectively, according to dynamic mechanical thermal analysis and acoustic testing. The damping coefficients of the polyol-treated flax composites were larger than those of the non-treated flax and the aramid- or carbon-fibre composites prepared under similar conditions. The relatively high damping behaviour of polyol-treated flax fibre reinforced composite is attributed to a stick―slip mechanism that involves the cyclic breaking and reformation of hydrogen bonds between the polyols and lamellae of the cell walls or microfibrils within the lamellae.

Chemical industry parachemical industry, Industrie chimique et parachimique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, 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, Copolymérisation catalyseur complexe, Complex catalyst copolymerization, Copolimerización catalizador complejo, Copolymérisation ouverture cycle, Ring opening copolymerization, Copolimerización abertura ciclo, Effet concentration, Concentration effect, Efecto concentración, Etude expérimentale, Experimental study, Estudio experimental, Fibre minérale, Mineral fiber, Fibra inorgánica, Fibre verre, Glass fiber, Fibra vidrio, Huile lin, Linseed oil, Aceite linaza, Huile végétale, Vegetable oil, Aceite vegetal, Matériau composite, Composite material, Material compuesto, Matériau renforcé fibre, Fiber reinforced material, Material reforzado fibra, Moulage pultrusion, Pultrusion, Moldeo pultrusión, Norbornène dérivé copolymère, Norbornene derivative copolymer, Norborneno derivado copolímero, Origine végétale, Plant origin, Origen vegetal, Polymérisation métathèse, Metathesis polymerization, Polimerización metátesis, Propriété dynamomécanique, Dynamic mechanical properties, Propiedad dinamomecánica, Propriété mécanique, Mechanical properties, Propiedad mecánica, Résistance flexion, Bending strength, Resistencia flexión, Silane organique, Organic silane, Silano orgánico, Traitement surface, Surface treatment, Tratamiento superficie, Catalyseur Grubbs, A Glass fibers, B. Interface/interphase, E. Pultrusion, and E. Surface treatments

Economical glass fiber reinforced polymer composites were developed from biorenewable resins utilizing a highly automated pultrusion process. The composites were successfully pultruded with a self-built table-top pultrusion machine. The interfacial interaction of the composites was significantly improved after surface modification with a silane coupling agent. The optimum silane concentration was determined by testing the mechanical properties of the pultruded fiber reinforced composites. Composites reinforced with fibers that were treated with a 3% silane solution exhibited the best properties in both DMA and flexural tests.

Chemical industry parachemical industry, Industrie chimique et parachimique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, 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, Effet concentration, Concentration effect, Efecto concentración, Effet mémoire forme, Shape memory effect, Efecto memoria forma, Etude expérimentale, Experimental study, Estudio experimental, Graphène, Graphene, Matériau composite, Composite material, Material compuesto, Matériau renforcé dispersion, Dispersion reinforced material, Material renforzado dispersión, Nanocomposite, Nanocompuesto, Polyaddition, Poliadición, Polymère greffé, Graft polymers, Propriété dynamomécanique, Dynamic mechanical properties, Propiedad dinamomecánica, Propriété mécanique, Mechanical properties, Propiedad mecánica, Propriété thermique, Thermal properties, Propiedad térmica, Propriété traction, Tensile property, Propiedad tracción, Préparation, Preparation, Preparación, Température transition vitreuse, Glass transition temperature, Temperatura transición vítrosa, Traitement surface, Surface treatment, Tratamiento superficie, Uréthanne polymère, Polyurethane, Uretano polímero, Graphène fonctionnalisé, Nanofeuillet, A. Nano-structures, A. Smart materials, B. Thermomechanical, and E. Surface treatments

High-performance polyurethane nanocomposites with surface-functionalized, nano-layered graphene sheets were fabricated by covalent incorporation. Partially reduced graphene nanosheets or surface-functionalized graphene with diazonium salts carrying phenethyl alcohol groups were physically-blended or covalently-bonded with amorphous polyurethane. FTIR-ATR, XPS, WAXD, and AFM characterization of the graphene demonstrated the surface functional groups and the enlarged interlayer space of the single or few-layered graphene. Functionalized graphene/PU composites with a crosslinked structure, which was introduced by the urethane linkages between the multifunctional graphene and the NCO-terminated PU, showed greater shape memory properties, as well as greater mechanical, thermal, and dynamic mechanical properties, than the reduced graphene/PU composites with good shape memory properties, due to fine dispersion-induced hydrogen interactions. The functionalized graphene/PU showed up to 98% shape fixity and a 94% shape recovery ratio after four cycles, and the hysteresis loss was as low as 2% at an extremely low loading of 0.5%.

Chemical industry parachemical industry, Industrie chimique et parachimique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, 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 thermique, Thermal conductivity, Conductividad térmica, Degré dispersion, Dispersion degree, Grado dispersión, Effet concentration, Concentration effect, Efecto concentración, Etude expérimentale, Experimental study, Estudio experimental, Groupe carboxyle, Carboxyl group, Grupo carboxilo, Matériau composite, Composite material, Material compuesto, Morphologie, Morphology, Morfología, Méthacrylate de méthyle polymère, Methyl methacrylate polymer, Metacrilato de metilo polímero, Perméabilité gaz, Gas permeability, Permeabilidad gas, Polymérisation photochimique, Photopolymerization, Polimerización fotoquímica, Propriété dynamomécanique, Dynamic mechanical properties, Propiedad dinamomecánica, Propriété thermique, Thermal properties, Propiedad térmica, Propriété transport, Transport properties, Propiedad transporte, Préparation, Preparation, Preparación, Rayonnement UV, Ultraviolet radiation, Radiación ultravioleta, Stabilité thermique, Thermal stability, Estabilidad térmica, Traitement surface, Surface treatment, Tratamiento superficie, Graphène fonctionnalisé, Graphène oxyde, Oxyde de graphène réduit, A. Polymer-matrix composites (PMCs), B. Physical properties, B. Thermal properties, and UV-curing

In this study, the effects of different carboxylic groups content for thermally reduced graphene oxides (TRGs) in improving physical properties of PMMA composites was reported. The PMMA/thermally reduce graphene oxides (TRGs) composites (PTC) were prepared by an easy and environmentally friendly UV-curing method in the presence of TRGs with different carboxylic groups content TRGs and then characterized by Fourier-Transformation infrared spectroscopy. The different levels of TRGs with higher carboxylic group contents were observed the better dispersion capability in PTC than TRGs with lower carboxylic groups content and non-functionalized TRGs based on the morphological observation of transmission electron microscopy (TEM). The better dispersion capability of the TRGs with higher carboxylic group contents in PTC membranes was found to lead significant enhanced thermal stability (TGA, DSC), mechanical strength (DMA), thermal conductivity (HD) and gas permeability (GPA).

Chemical industry parachemical industry, Industrie chimique et parachimique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, 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 surface polymère, Surfactant polymer, Agente superficie polímero, Ether cyclique polymère, Cyclic ether polymer, Eter cíclico polímero, Ethylène oxyde polymère, Ethylene oxide polymer, Etileno óxido polímero, Etude expérimentale, Experimental study, Estudio experimental, Extrusion, Extrusión, Fibre revêtue, Coated fiber, Fibra revestida, Limite élasticité, Yield strength, Límite elasticidad, Matériau composite, Composite material, Material compuesto, Matériau renforcé fibre, Fiber reinforced material, Material reforzado fibra, Microfibrille, Microfibril, Microfibrilla, Module Young, Young modulus, Módulo Young, Morphologie, Morphology, Morfología, Moulage compression, Compression molding, Moldeo por compresión, Moulage injection, Injection molding, Moldeo por inyección, Oléfine polymère, Olefin polymer, Olefina polímero, Presse extrusion double vis, Double screw extruder, Prensa extrusión doble tornillo, Propriété mécanique, Mechanical properties, Propiedad mecánica, Propène polymère, Propylene polymer, Propeno polímero, Renforcement mécanique, Strengthening, Refuerzo mecánico, Traitement surface, Surface treatment, Tratamiento superficie, Cellulose microfibrillée, Mélangeage état fondu, A. Polymer-matrix composites (PMCs), B. Mechanical properties, and E. Surface treatments

Polypropylene (PP)/microfibrillated cellulose (MFC) composites were prepared by coating nano to sub-micrometer width and several micrometer length MFC with a surfactant, polyoxyethylene (10) nonylphenyl ether. The composites were produced by melt compounding using a twin screw extruder and subsequent hot compression or injection moldings. Although the coating provided good dispersion of the MFC in the PP matrix, reinforcing effects on the Young's modulus and yield strength were negligible because of weak adhesive interactions between PP and MFC mediated by the surfactant. Addition of maleic anhydride grafted PP (MAPP) to the PP/surface-coated MFC composites improved the interfacial adhesive interaction, leading to a high Young's modulus and strength at yield while maintaining the large plastic deformation. Injection molded PP (80 wt%)/surface-coated MFC (10 wt%) composites containing 10 wt% MAPP showed 45% higher Young's modulus and 50% higher yield strength than the neat PP.

Chemical industry parachemical industry, Industrie chimique et parachimique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, 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, Adhésif, Adhesive, Adhesivo, Adhésivité, Adhesivity, Adhesividad, Assemblage à onglet, Scarf joint, Junta biselada, Collage, Adhesive bonding, Enlace adhesivo, Contrôle qualité, Quality control, Control de calidad, Emission acoustique, Acoustic emission, Emisión acústica, 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 fibre, Fiber reinforced material, Material reforzado fibra, Méthode non destructive, Non destructive method, Método no destructivo, Optimisation, Optimization, Optimización, Propriété mécanique, Mechanical properties, Propiedad mecánica, Propriété surface, Surface properties, Propiedad superficie, Propriété traction, Tensile property, Propiedad tracción, Réparation, Repair, Reparación, Stratifié, Laminate, Estratificado, Traitement par laser, Laser assisted processing, Traitement surface, Surface treatment, Tratamiento superficie, A: Carbon fibre, B: Adhesion, E: Joints/joining, and E: Surface treatments

In this work bonding surface activation for scarfed repair bonds on carbon fibre reinforced plastics is investigated. For activation and cleaning of a scarfed bond between two cured laminates different Nd:YAG lasers were employed, in order to remove resin to enable embedding of fibres in the adhesive film and to improve wetting and bonding between the fibres and the adhesive. Microscopic investigation shows varying degrees of fibre stripping and oxidation. Latter enables covalent bonds between fibres and epoxy adhesive leading to a full recovery of the parts mechanical properties demonstrated in tensile tests. Measurement of acoustic emission during tensile tests gave further insight on the quality of the joint. Results from other activation parameters indicate optimisation steps to further improve the bonding strength and thus reducing repair area and costs significantly.

Chemical industry parachemical industry, Industrie chimique et parachimique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, 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, Constante diélectrique, Permittivity, Constante dieléctrica, Cristallinité, Crystallinity, Cristalinidad, Disruption électrique, Electric breakdown, Disrupción eléctrica, Effet substituant, Substituent effect, Efecto sustituyente, Effet température, Temperature effect, Efecto temperatura, Ethylène basse densité polymère, Low density ethylene polymer, Etileno baja densidad polímero, Etude expérimentale, Experimental study, Estudio experimental, Matériau composite, Composite material, Material compuesto, Morphologie, Morphology, Morfología, Nanocomposite, Nanocompuesto, Oléfine polymère, Olefin polymer, Olefina polímero, Oxyde de magnésium, Magnesium oxide, Magnesio óxido, Propriété diélectrique, Dielectric properties, Propiedad dieléctrica, Propriété rhéologique, Rheological properties, Propiedad reológica, Propriété électrique, Electrical properties, Propiedad eléctrica, Silane organique, Organic silane, Silano orgánico, Traitement surface, Surface treatment, Tratamiento superficie, Viscoélasticité, Viscoelasticity, Viscoelasticidad, A. Nano-structures, A. Polymer-matrix composites (PMCs), and B. Electrical properties

Three silane coupling agents with amino, long alkyl chain or vinyl functional groups were used to modify magnesia (MgO) nanoparticles. The modified nanoparticles were then mechanically mixed with low-density polyethylene (LDPE) to fabricate insulating nanocomposites. The average size of the modified MgO aggregates dispersed in LDPE matrix was below 100 nm. The pulsed electroacoustic method indicated that the MgO nanoparticles regardless of surface modification were effective to suppress the packet-like charge injection and accumulation in the LDPE sample, decrease the permittivity and tan δ, and also improved the direct-current breakdown strength of LDPE at different temperatures. The best insulating properties were found in the case of vinyl-silane-modified-MgO/LDPE samples probably owing to the improved interfacial adhesion. A multi-core model was used to discuss the results obtained.

Chemical industry parachemical industry, Industrie chimique et parachimique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, 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, Facteur intensité contrainte, Stress intensity factor, Factor intensidad tensión, Matériau composite, Composite material, Material compuesto, Matériau renforcé dispersion, Dispersion reinforced material, Material renforzado dispersión, Mode rupture, Fracture mode, Modo ruptura, Module élasticité, Elastic modulus, Módulo elasticidad, Morphologie, Morphology, Morfología, Nanocomposite, Nanocompuesto, Nanotube carbone, Carbon nanotubes, Nanotube multifeuillets, Multiwalled nanotube, Polyol, Poliol, Propagation fissure, Crack propagation, Propagación fisura, Propriété mécanique, Mechanical properties, Propiedad mecánica, Renforcement mécanique, Strengthening, Refuerzo mecánico, Traitement surface, Surface treatment, Tratamiento superficie, Diluant réactif, Nanotube carbone fonctionnalisé, A. Polymer-matrix composites (PMCs), B. Fracture, D. Optical microscopy Physical methods of analysis, and E. Thermosetting resin

The synergistic effects of reactive polyol diluent and amino-functionalized multi-walled carbon nanotubes on fracture of two- and three-phase (hybrid) epoxy nanocomposites are investigated under quasi-static and dynamic loading conditions. Digital image correlation method with a drop-tower and high-speed camera are used for dynamic tests. The crack-tip deformation histories and fracture parameters for stationary and growing cracks are extracted. Tests show improved crack initiation toughness in modified-epoxies relative to the neat resin with the highest enhancement in hybrid nanocomposites. The dynamic crack initiation toughness values are found to be consistently lower than the static counterparts. Fractographic examinations reveal distinct rate-dependent morphologies.

Chemical industry parachemical industry, Industrie chimique et parachimique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, Polymers, paint and wood industries, Polymères, industries des peintures et bois, Sciences exactes et technologie, Exact sciences and technology, Physique, Physics, Domaines interdisciplinaires: science des materiaux; rheologie, Cross-disciplinary physics: materials science; rheology, Science des matériaux, Materials science, Matériaux particuliers, Specific materials, Fullerènes et matériaux apparentés; diamants, graphite, Fullerenes and related materials; diamonds, graphite, 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, Composite carbone carbone, Carbon carbon composite, Composite carbono carbono, Composite hybride, Hybrid composite, Compuesto híbrido, Dépôt électrophorétique, Electrophoretic deposition, Depósito electroforético, Effet température, Temperature effect, Efecto temperatura, 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 fibre, Fiber reinforced material, Material reforzado fibra, Module élasticité, Elastic modulus, Módulo elasticidad, Nanocomposite, Nanocompuesto, Nanotube carbone, Carbon nanotubes, Nanotube multifeuillets, Multiwalled nanotube, Propriété mécanique, Mechanical properties, Propiedad mecánica, Pyrolyse, Pyrolysis, Pirólisis, Résistance traction, Tensile strength, Resistencia tracción, Traitement surface, Surface treatment, Tratamiento superficie, Traitement thermique, Heat treatment, Tratamiento térmico, Nanotube carbone fonctionnalisé, A. Carbon fiber, A. Carbon-carbon composites (CCCs), B. Mechanical properties, and E. Heat treatment

An integrated multi-walled carbon nanotube (MWCNT)-carbon fiber (CF) hybrid material has been fabricated by electrophoretic deposition of acid-functionalized MWCNTs on CF surface followed by soaking in a 10% solution of petroleum pitch in toluene, followed by pyrolysis in a nitrogen atmosphere. It has been revealed that MWCNTs entirely covered the CF surface. Mechanical properties of composites reinforced by MWCNT-CF hybrids were considerably enhanced (up to 120% in tensile strength and 100% in elastic modulus) compared to composites reinforce by as-received CFs. According to fractography observations, robust interlocking occurred between epoxy matrix and MWCNT-CF hybrids.

Chemical industry parachemical industry, Industrie chimique et parachimique, Mechanics acoustics, Mécanique et acoustique, Metallurgy, welding, Métallurgie, soudage, 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, Adhésivité, Adhesivity, Adhesividad, Composé vinylique, Vinylic compound, Compuesto vinílico, Ester polymère, Ester polymer, Ester polímero, Etude expérimentale, Experimental study, Estudio experimental, Fibre minérale, Mineral fiber, Fibra inorgánica, Fibre revêtue, Coated fiber, Fibra revestida, Fibre verre, Glass fiber, Fibra vidrio, Interface fibre matrice, Matrix fiber interface, Interfase fibra matriz, Matériau composite, Composite material, Material compuesto, Matériau renforcé fibre, Fiber reinforced material, Material reforzado fibra, Module élasticité, Elastic modulus, Módulo elasticidad, Polymère insaturé, Unsaturated polymer, Polímero insaturado, Polymère silicium, Silicon polymer, Polímero silicio, Polymérisation décharge électrique, Glow discharge polymerization, Polimerización descarga eléctrica, Propriété interface, Interface properties, Propiedad interfase, Propriété mécanique, Mechanical properties, Propiedad mecánica, Relation mise en oeuvre propriété, Property processing relationship, Relación puesta en marcha propiedad, Résistance cisaillement, Shear strength, Resistencia cizallamiento, Silane organique, Organic silane, Silano orgánico, Traitement par plasma, Plasma assisted processing, Traitement surface, Surface treatment, Tratamiento superficie, Résistance cisaillement interfacial, A. Glass fibers, A. Polymer-matrix composites (PMCs), B. Interface/interphase, and E. Surface treatments

Plasma-polymerized tetravinylsilane was used to surface modify glass fibers to improve interfacial adhesion of a GF/polyester composite. Plasma polymer films of controllable thickness and physicochemical properties were deposited on unsized glass fibers by RF pulsed plasma using an effective power of 0.1-5 W. The interfacial adhesion of unsized, industrially sized, oxygen plasma treated, and plasma polymer coated fibers embedded in polyester resin was determined by microindentation. The plasma modification of the glass fibers enabled a considerable increase in the interfacial shear strength compared to unsized fibers. The interfacial shear strength for the optimized plasma coating was 26% higher than that for the industrial sizing.