Structure and Physical Properties of Sol-Gel Derived Polypropyleneglycol/Silica Hybrid.
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Polypropyleneglycol (PPG) oligomer with amino groups on the chain ends (<I>M</I><SUB>n</SUB>=2000) was reacted with isocyanatopropyltriethoxysilane, and triethoxysilane groups were end-capped onto PPG. Transparent PPG/silica hybrid films could be obtained by mixing TEOS with the triethoxysilane end-capped PPG. The tensile strength and modulus of the PPG/silica hybrid increased with increasing amount of mixed TEOS. The temperature dependence of the dynamic viscoelastic measurements gave the double peaks of tanδ at-50°C and 30°C. The peak at-50°C was caused by the glass transition of PPG matrix. The peak at 30°C may be due to the glass transition of the silica rich domains, which were formed by the micro-phase separation during sol-gel process. This morphology was confirmed by the SAXS measurement, showing a large and sharp peak at the scattering vector q=1.3 nm<SUP>-1</SUP>; this peak shifted to the higher temperatures with increasing amounts of initial TEOS content.
- 公益社団法人 高分子学会の論文
公益社団法人 高分子学会 | 論文
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