Abstract:TiO2 nanoparticle can be used for the improvement of performance of the epoxy resin composites. In this study, the effect of the size of TiO2 nanoparticle on the mechanical properties for the epoxy resin composites was investigated. The size of TiO2 nanoparticle was easily controlled by heat treatment. The heat treatment of TiO2 nanoparticle was conducted between 700 ℃ and 900 ℃. The obtained size of TiO2 nanoparticle was 20 nm, 100 nm and 200 nm respectively. As the diameter of TiO2

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... noparticle is smaller, the epoxy resin composite specimen showed higher tensile strength. It was also found that Vickers hardness of epoxy resin was increased by the addition of TiO2 nanoparticle. But the size of TiO2 nanoparticle did not strongly affected to the Vickers hardness of this material. The fracture surface of epoxy resin showed clear difference by the size of TiO2 nanoparticlet.