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-SO3−Na+)) was successfully grafted onto nano-sized silica surface by the radical polymerization of St-SO3−Na+ 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-SO3−Na+) grafting increased with progress of the polymerization and reached about 30%. The poly(St-SO3−Na+)-grafted silica was treated with tributyltetradecylphosphonium chloride (Bu3RP+Cl−) to convert the SO3−Na+ groups to alkyl phosphonium salt, SO3−P+Bu3R, groups. The grafting of poly(St-SO3−P+Bu3R) onto the silica surface was confirmed by IR spectra. The poly(St-SO3−P+Bu3R)-grafted silica gave a stable dispersion in DMSO and poly(dimethylsiloxane). It was found that silicone rubber filled with the poly(St-SO3−P+Bu3R)-grafted silica shows extremely strong antibacterial activity. The silicone rubber surface has an ability to inhibit the reproduction of a Staphylococcus aureus and an Escherichia coli.
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Yamashita, R., Takeuchi, Y., Kikuchi, H. et al. Preparation of Antibacterial Polymer-grafted Nano-sized Silica and Surface Properties of Silicone Rubber Filled with the Silica. Polym J 38, 844–851 (2006). https://doi.org/10.1295/polymj.PJ2005225
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DOI: https://doi.org/10.1295/polymj.PJ2005225
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