Temperature dependence of fracture toughness of silica/epoxy composites: Related to microstructure of nano- and micro-particles packing |
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Authors: | Soon-Chul Kwon Tadaharu Adachi Wakako Araki |
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Affiliation: | aDepartment of Mechanical Sciences and Engineering, Tokyo Institute of Technology, 2-12-1-I6-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan |
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Abstract: | Temperature dependence of the fracture toughness of epoxy composites reinforced with nano- and micro-silica particles was evaluated. Epoxy composites containing varied composition ratios ΦSP of spherical nano- and micro-silica particles, 240 nm and 1.56 μm, were prepared at a fixed volume fraction (VP = 0.30). The thermo-viscoelasticity and fracture toughness of the composites and neat epoxy were measured at 143 K, 185 K, 228 K, 296 K, 363 K, and 399 K. Experimental results revealed that fracture toughness strongly depended on the microstructure of nano- and micro-particles bidispersion as well as its interactions with the matrix at all temperature, but depended on toughened matrix due to increase in mobility of matrix at the relaxation temperatures. |
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Keywords: | A Particle-reinforcement A Polymer–matrix composites (PMCs) B Fracture toughness Particle packing |
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