Surface hardness and transparency of poly(methyl methacrylate)‐silica coat film derived from perhydropolysilazane |
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| Authors: | Reiko Saito Shin‐ichiro Kobayashi Hidetaka Hayashi Toshihisa Shimo |
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| Affiliation: | 1. Department of Organic and Polymeric Materials, Tokyo Institute of Technology, Meguro, Tokyo 152‐8552, Japan;2. Toyota Industries Corporation, 8, Chaya, Kyowa‐cho, Obu‐shi, Aichi 474‐8601 Japan |
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| Abstract: | To prepare hard and transparent poly (methyl methacrylate)‐silica coat film on glass or polycarbonate substrates, poly(methyl methacrylate‐co‐2‐hydroxyethyl methacrylate) random copolymers and perhydropolysilazane (PHPS) were blended in solution. Then the solution was cast on the substrates. The grafting of PHPS onto 2‐hydroxyethyl methacrylate unit was analyzed by 1H NMR spectroscopy. Surface hardness and transparency of the coat film were measured by nano‐indentation method and UV‐Vis spectroscopy, respectively. Surface hardness of coat film depended on the volume fraction of silica in the coat film, and reached 2.7 GPa when the volume fraction of silica was 76.4%. Transparency of the coat films prepared with PHPS was almost 100%, indicating that the coat film prepared with PHPS was highly transparent not only on glass substrate but also on the polycarbonate substrate. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007 |
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| Keywords: | coatings composites hardness silicas transparency |
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