ジエチルエーテル-水酸化ナトリウム水溶液処理によるフェニル修飾ポリシロキサンガラスの高収率縮重合反応

概要

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Polycondensation reaction of 70PhSiO_<3/2>・30Ph_2SiO_<2/2> (Ph=C_2H_5) polysiloxane has been almost completed by treating the corresponding gel with a diethyl ether-aqueous NaOH immiscible two phase liquids. The phenyl-modified siloxane gel is dissolved in diethyl ether phase which is immiscible with an NaOH aqueous solution. After stirring the immiscible solution vigorously, the glass-ether phase is extracted and then subjected to evaporation to leave glass precursor. The phenyl-modified siloxane glass is prepared by melting the precursor at 200℃ over 1 h, in which the polycondensation reaction of siloxane network is almost completed. It is found that the obtained siloxane glass shows a softening temperature around 80℃ and this value remains unchanged even after heat-treatment over 200 h at 200℃.
社団法人日本セラミックス協会の論文
2005-03-01