聚（四甲基对硅亚苯基-二甲基）硅氧烷共聚物的制备及其热性质

化工进展

聚（四甲基对硅亚苯基-二甲基）硅氧烷共聚物的制备及其热性质

陈循军，崔英德，尹国强，贾振宇

西北工业大学材料学院；仲恺农业技术学院绿色化工研究所

出版日期:2007-09-25 发布日期:2007-09-25

Preparation and thermal property of poly（tetramethyl-p-silphenylene-dimethyl）siloxane

CHEN Xunjun，CUI Yingde，YIN Guoqiang，JIA Zhenyu

School of Materials Science and Engineering，Northwestern Polytechnical University；Institute of Green Chemical Engineering，Zhongkai University of Agriculture and Technology

Online:2007-09-25 Published:2007-09-25

摘要/Abstract

摘要： 以对二溴苯为起始原料，在超声辐照下制备得到对二溴苯双格氏试剂，然后与二甲基氢氯硅烷制备得到1，4－双（二甲基硅基）苯）（BDSB）。以B(C6F5)3为催化剂，BDSB与二甲基二甲氧基硅烷缩聚制备得到聚（四甲基对硅亚苯基-二甲基）硅氧烷共聚物（PTMPS-DMS），并对催化剂浓度、反应温度对反应速率的影响进行了研究。29Si NMR 表明产物不是严格交替共聚物，具有38％～49％的嵌段结构。PTMPS-DMS的Tg＝－56.2℃，起始降解温度氮气、空气中分别为334 ℃、345 ℃。在氮气中PTMPS-DMS出现一步热失重，最大热失重温度是529℃，在空气中则分别在539 ℃、559 ℃、662 ℃出现多步热失重。

Abstract: Grignard reagent was prepared under ultrasonic radiation with 1，4-dibromobenzene as start material. The Grignard reagent then reacted with dimethylchlorosilane to form 1，4-bis（dimethylsilyl）benzene（BDSB）. Poly（tetramethyl-p-silylphenylene-dimethyl）siloxane was prepared by the polycondensation of BDSB and dimethyldimethoxysilane catalyzed by B(C6F5)3，the effect of B(C6F5)3 concentration and reaction temperature on the reaction rate was also studied as well. 29Si NMR shows that the polymer is not perfectly alternated with 38～49% randomization. The Tg of the polymer is －56.2℃. The polymer begins to degrade at 334℃ in nitrogen and 345℃ in air. The polymer shows one-step weight loss in nitrogen at 529℃，but multi-step weight loss in air at 539，559，662℃。

陈循军，崔英德，尹国强，贾振宇. 聚（四甲基对硅亚苯基-二甲基）硅氧烷共聚物的制备及其热性质 [J]. 化工进展.

CHEN Xunjun，CUI Yingde，YIN Guoqiang，JIA Zhenyu. Preparation and thermal property of poly（tetramethyl-p-silphenylene-dimethyl）siloxane[J]. Chemical Industry and Engineering Progree.