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Epoxy Resin Composites (epoxy + resin_composite)
Selected AbstractsMechanism of interactions of eggshell microparticles with epoxy resinsPOLYMER ENGINEERING & SCIENCE, Issue 7 2009Genzhong Ji Large surface-area microparticles of natural chicken eggshell were prepared and characterized to illustrate how such particles can improve the toughness of epoxy resins. A small amount of organic compounds, in particular proteins, were found to be present in the microparticles and beneficial to the enhancement of the mechanical properties of the epoxy resins. Scanning electron microscopic analysis of the rough fracture surfaces show that there are full of plastic deformation, voids, cavities, and debonding phenomena in the microparticle-filled composites. Positron annihilation study indicates that the lifetime of ,3 o-Ps varies and the corresponding intensity of I3 becomes weak with the increase of eggshell particle content, which indicates that there is a good interaction between the epoxy resin and the filling particles. This gives rise to significant improvement in the toughness of the filled resin. The impact strength of the epoxy resin composite reaches 16.7 kJ/m2 compared with 9.7 kJ/m2 of neat epoxy resin when the epoxy resin composite is filled with only 5 mass% eggshell particles. POLYM. ENG. SCI., 2009. © 2009 Society of Plastics Engineers [source] Influence of high temperature and pressure ammonia solution treatment on interfacial behavior of carbon fiber/epoxy resin compositesJOURNAL OF APPLIED POLYMER SCIENCE, Issue 6 2009L. H. Meng Abstract The method of high temperature and pressure ammonia solution treatment to improve the interfacial performances of carbon fiber/epoxy composites is discussed in this study. Besides, the influence of high temperature and pressure ammonia solution treatment on carbon fiber and its reinforced epoxy composite interface performance were studied. The untreated and treated carbon fibers were characterized by monofilament tensile test, X-ray photoelectron spectroscopy (XPS), and atomic force microscope (AFM). The interfacial adhesion of the untreated and treated carbon fibers reinforced epoxy resin composites were also evaluated by interface shear strength (IFSS) test, interlaminar shear strength (ILSS) test, and fracture morphology analysis. It was found that the interfacial adhesion of composites increased greatly after high temperature and pressure ammonia solution treatment. The improvement of interfacial adhesion was attributed to the increase of polar functional groups and surface roughness of carbon fibers surface after treatment. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009 [source] Glass Transition Temperature Depression at the Percolation Threshold in Carbon Nanotube,Epoxy Resin and Polypyrrole,Epoxy Resin CompositesMACROMOLECULAR RAPID COMMUNICATIONS, Issue 5 2005Sophie Barrau Abstract Summary: The glass transition temperatures of conducting composites, obtained by blending carbon nanotubes (CNTs) or polypyrrole (PPy) particles with epoxy resin, were investigated by using both differential scanning calorimetry (DSC) and dynamical mechanical thermal analysis (DMTA). For both composites, dc and ac conductivity measurements revealed an electrical percolation threshold at which the glass transition temperature and mechanical modulus of the composites pass through a minimum. DC conductivity, ,dc, as a function of the conducting filler concentration of the CNT, (,) and PPy, (,) epoxy resin composites. [source] Effect of grafting alkoxysilane on the surface properties of Kevlar fiberPOLYMER COMPOSITES, Issue 3 2007Tao Ai This research applied the methodology of metalation and grafting alkoxysilane to modify the surface of Kevlar-29 fiber. The surface properties of the modified Kevlar fiber were characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, atomic force microscopy, and Brunauer-Emmett-Teller isothermal adsorption analysis. The relationship between surface characteristics of Kevlar fiber and its interfacial adhesion of Kevlar fiber-reinforced epoxy resin composites was also discussed. Compared with the untreated fiber, the surface of the modified Kevlar fiber was much rougher, its oxygen content increased by about 12%, the surface area enlarged about 10 times, and the wetting behavior improved. Due to the modification of the fiber, the adhesion between the fiber and the resin matrix was markedly improved and the Interlaminar Shear Strength of its epoxy composites increased by about 57%. POLYM. COMPOS. 28:412,416, 2007. © 2007 Society of Plastics Engineers. [source] Influence of high temperature and pressure ammonia solution treatment on interfacial behavior of carbon fiber/epoxy resin compositesJOURNAL OF APPLIED POLYMER SCIENCE, Issue 6 2009L. H. Meng Abstract The method of high temperature and pressure ammonia solution treatment to improve the interfacial performances of carbon fiber/epoxy composites is discussed in this study. Besides, the influence of high temperature and pressure ammonia solution treatment on carbon fiber and its reinforced epoxy composite interface performance were studied. The untreated and treated carbon fibers were characterized by monofilament tensile test, X-ray photoelectron spectroscopy (XPS), and atomic force microscope (AFM). The interfacial adhesion of the untreated and treated carbon fibers reinforced epoxy resin composites were also evaluated by interface shear strength (IFSS) test, interlaminar shear strength (ILSS) test, and fracture morphology analysis. It was found that the interfacial adhesion of composites increased greatly after high temperature and pressure ammonia solution treatment. The improvement of interfacial adhesion was attributed to the increase of polar functional groups and surface roughness of carbon fibers surface after treatment. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009 [source] | ||||||||||