Abstract
The fracture toughness of the nano-silica particulate-reinforced epoxy composites with different crosslinking densities were investigated experimentally to consider the interaction effects between the nano-particles and the network structure in matrix resin. The composite materials were prepared by adding silica particles of 240 nm in diameter to the bisphenol A type epoxy resins with the particle volume fraction of 0.2. The neat epoxy resins and the matrix resin in the composite were cured non-stoichiometrically to change the crosslinking densities of the resins. Although the fracture toughness decreased monotonously from the one of the stoichiometrically cured resin as the crosslinking density decreased, the fracture toughness of the composite was largest at little lower crosslinking density than 2740 mol/m^3: the stoichiometric condition. The fracture toughness and the bending strength were improved for higher crosslinking density than 2000 mol/m^3 with by adding the particles. At lower crosslinking density, the particles worked against the mechanical properties as defects in the matrix resins.
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