Abstract: Methyl methacrylate (MMA) emulsion polymerization in the presence of nanometer calcium carbonate (nano-CaCO₃) surface modified with γ-methacryloxypropyltrimethoxysilane (MPTMS) was carried out to prepare poly (methyl methacrylate) (PMMA)/nano-CaCO₃ composite. The reaction between nano-CaCO₃ and MPTMS, and the grafting of PMMA onto nano-CaCO₃ were confirmed by infrared spectrum. The grafting ratio and grafting efficiency of PMMA on nano-CaCO₃ modified with MPTMS were much higher than that on nano-CaCO₃ modified with stearic acid. The grafting ratio of PMMA increased as the weight ratio between MMA and nano-CaCO₃ increased, while the grafting efficiency of PMMA decreased. Transmission electron micrograph showed that nano-CaCO₃ covered with PMMA was formed by in-situ emulsion polymerization.

Key words: Methyl methacrylate, Nanometer calcium carbonate, Emulsion polymerization, γ-methacryloxypropyltrimeth-oxysilane, Grafting

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