H-bonding template-directed synthesis of a complete m-PDA-bridged ladder polyhydrosiloxane (OLPHS)

H-bonding template-directed synthesis of a

complete m-PDA-bridged ladder polyhydrosiloxane (OLPHS)

佚名

【期刊名称】《中国化学快报（英文版）》 【年(卷),期】2007(018)007

【摘要】A highly ordered m-phenylenediimino-bridged ladder polyhydrosiloxane (abbr. OLPHS) with Mn = 1.24 × 104 was synthesized stoichiometric hydrolysis and dehydrochlorination condensation reaction between Si-Cl and Si-OH bonds. The complete ladder structure of OLPHS has been confirmed by the following three data. Two characteristic Bragg's peaks representing the ladder width (w = 0.94 nm) and ladder thickness (t = 0.42 nm) were observed in XRD analysis, which are consistent with those calculated by molecular simulation. The very sharp absorption with a small half-peak width (w1/2 = 0.5 ppm) for [(-HN)HSiO2/2]n moiety of OLPHS in 29Si NMR spectrum indicated presence of the complete ladder structure. As collateral evidence, a higher glass transition temperature (Tg = 105 ℃) is also recorded in the DSC measurement, implying the high stiffness of ladder chain of OLPHS.(C) 2007 Rong Ben Zhang. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved. 【总页数】4页(779-782)

【关键词】H-bonding template;Ladder polysiloxane;Self-

assembly;Stepwise coupling/polymerization 【作者】佚名

【作者单位】State Key Laboratory on Polymer Physics & Chemistry, Joint Laboratory of Polymer Science & Materials,Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China;Graduate School of the Chinese Academy of Sciences, Beijing 100039, China;College of Chemistry & Environmental Science, Hebei University, Baoding 071002, China;State Key Laboratory on Polymer Physics & Chemistry, Joint Laboratory of Polymer Science & Materials,Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China;Graduate School of the Chinese Academy of Sciences, Beijing 100039, China;State Key Laboratory on Polymer Physics & Chemistry, Joint Laboratory of Polymer Science & Materials,Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China;Graduate School of the Chinese Academy of Sciences, Beijing 100039, China;State Key Laboratory on Polymer Physics & Chemistry, Joint Laboratory of Polymer Science & Materials,Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China;State Key Laboratory on Polymer Physics & Chemistry, Joint Laboratory of Polymer Science & Materials,Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China 【正文语种】中文

【中图分类】O6 【文献来源】

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