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Mechanical And Morphological Properties Of Carbon Fiber Reinforced–modified Epoxy Composites

B. R. Guduri, Adriaan S. Luyt
Published 2006 · Materials Science
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Epoxy, prepared through aminomethyl 3,5,5-trimethylcyclohexylamine hardening of diglyci- dylether of bisphenol-A (DGEBA) prepolymer, toughened with polycarbonate (PC) in different proportions, and rein- forced with carbon fiber, was investigated by differential scanning calorimetry, tensile and interlaminar shear strength testing, and scanning electron microscopy (SEM). A single glass transition temperature was found in all compo- sitions of the epoxy/PC blend system. The tensile properties of the blend were found to be better than that of the pure epoxy matrix. They increased with PC content up to 10%, beyond which they decreased. The influence of carbon fiber orientation on the mechanical properties of the composites was studied, where the fiber content was kept constant at 68 wt %. Composites with 45° fiber orientation were found to have very weak mechanical properties, and the mechanical properties of the blend matrix composites were found to be better than those of the pure epoxy matrix composites. The fracture and surface morphologies of the composite samples were characterized by SEM. Good bonding was observed between the fiber and matrix for the blend matrix compos- ites. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 3529 -3536, 2006

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