ABSTRACT:Antibacterial polymer was grafted onto nano-sized silica surface and the surface properties of silicone rubber filled with the silica were investigated. The grafting of antibacterial polymer was carried out by two-step reactions as follows. Poly(p-styrene sodium sulfate) (poly(St-SO 3 À Na þ )) was successfully grafted onto nano-sized silica surface by the radical polymerization of St-SO 3 À Na þ initiated by the system consisting of trichloroacetyl groups on the silica surface and Mo(CO) 6 : trichloroacetyl groups were introduced onto the silica surface by the reaction of amino groups with trichloroacetyl isocyanate. The percentage of poly(St-SO 3 À Na þ ) grafting increased with progress of the polymerization and reached about 30%. The poly(St-SO 3 À Na þ )-grafted silica was treated with tributyltetradecylphosphonium chloride (Bu 3
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