화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Macromolecular Research, Vol.12, No.2, 156-171, April, 2004
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Control of Molecular Weight, Stereochemistry and Higher Order Structure of Siloxane-containing Polymers and Their Functional Design
Yusuke Kawakami†, Yuning Li, Yang Liu, Makoto Seino, Chitsakon Pakjamsai, Motoi Oishi, Yeong Hee Cho, and Ichiro Imae
  • Graduate School of Materials Science, Japan Advanced Institute of Science and Technology (JAIST), 1-1 Asahidai,Tatsunokuchi, Ishikawa 923-1292, Japan
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We describe the precision synthesis schemes of siloxane-containing polymers, i.e., the control of their molecular weight, stereoregularity, and higher-order structures. First, we found a new catalytic dehydrocoupling reaction of water with bis(dimethylsilyl)benzene to give poly(phenylene-disiloxane). Together with this reaction, we applied hetero-condensations to the synthesis of thermally stable poly(arylene-siloxane)s. The dehydrocoupling reaction was applied to the synthesis of syndiotactic poly(methylphenylsiloxane) and poly(silsesquioxane)s, which we also prepared by hydrolysis and deaminative condensation reactions. We discuss the tendency for loop formation to occur in the synthesis of poly(silsesquioxane) by hydrolysis, and provide comments on the design of functionality of the polymers produced. By taking advantage of the low energy barrier to rotation in the silicon-oxygen bond, we designed selective oxygen-permeable membrane materials and liquid crystalline materials. The low surface free energy of siloxane-containing systems allows surface modification of a blend film and the design of holographic grating materials.
Keywords:siloxane-containing polymers;precision synthesis.
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