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Home  >  Journal list  >  Polymer Journal  >  Vol.38  No.8 (2006)  >  pp.844-851

Polymer Journal
<<Previous article Vol.38  No.8 (2006)   pp.844 - 851 Next article>>

Preparation of Antibacterial Polymer-grafted Nano-sized Silica and Surface Properties of Silicone Rubber Filled with the Silica

Risako Yamashita1), Yoko Takeuchi1), Hirofumi Kikuchi3), Kumi Shirai1), Takeshi Yamauchi2)4) and Norio Tsubokawa1)3)4)
1) Department of Material Science and Technology, Faculty of Engineering, Niigata University
2) Graduate School of Science and Technology, Niigata University
3) Niigata University Venture Business Laboratory
4) Center for Transdisciplinary Research, Niigata University


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-SO3Na+)) was successfully grafted onto nano-sized silica surface by the radical polymerization of St-SO3Na+ 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-SO3Na+) grafting increased with progress of the polymerization and reached about 30%. The poly(St-SO3Na+)-grafted silica was treated with tributyltetradecylphosphonium chloride (Bu3RP+Cl) to convert the SO3Na+ groups to alkyl phosphonium salt, SO3P+Bu3R, groups. The grafting of poly(St-SO3P+Bu3R) onto the silica surface was confirmed by IR spectra. The poly(St-SO3P+Bu3R)-grafted silica gave a stable dispersion in DMSO and poly(dimethylsiloxane). It was found that silicone rubber filled with the poly(St-SO3P+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.


Keyword:
Nano-sized Silica/ Surface Grafting of Polymer/ Polymeric Alkyl Phosphonium Salt/ Antibacterial Surface/ Silicone Rubber/ Composite

Published online: August 10, 2006
© Copyright, 2006 by The Society of Polymer Science, Japan

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