Phase-separation and distribution of phenyl groups for PhTES-TEOS coatings prepared on polycarbonate substrate |
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Authors: | Yutaka Mizuta Yusuke Daiko Atsushi Mineshige Masafumi Kobune Tetsuo Yazawa |
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Institution: | (1) Department of Materials Science and Chemistry, University of Hyogo, Shosha, Himeji, Hyogo 671-2201, Japan; |
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Abstract: | Phenyltriethoxysilane (PhTES) and tetraethoxysilane (TEOS) coatings xPhTES·(100 − x)TEOS (mol%)] (x = 0 − 80) were prepared on polycarbonate (PC) substrate, and adhesion, surface hardness and distribution of phenyl groups
were studied. The coatings with more than 60 mol% of PhTES showed good adhesion (≈ 100%), and the pencil hardness of PC substrate
(4B) improved to 2B or B after the coatings. Bulk gels with the same compositions were also prepared, and distribution of
phenyl groups were estimated using fourier transform infrared (FT-IR) spectroscopy (KBr method for bulk gels and attenuated
total reflection (ATR) method for coatings). A significant difference for the distribution of phenyl groups was clearly observed
between bulk gels and coatings, suggesting PC substrate affects the distribution of phenyl groups in coatings. The adhesion
and FTIR results revealed that there is an interaction caused by π-electrons between benzene rings on PC substrate and phenyl
groups of PhTES-TEOS coatings. It was found that the adhesion was strongly correlated with the phenylsilsesquioxane networks
formed around PC substrate side. |
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