| 在阳离子乳化剂的存在下八甲基环四硅氧烷的乳液聚合 |
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| 引用本文： | 刘淑芬,李平.在阳离子乳化剂的存在下八甲基环四硅氧烷的乳液聚合[J].高分子学报,1981,0(4):257-262. |
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| 作者姓名： | 刘淑芬 李平 |
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| 作者单位： | 中国科学院化学研究所
(刘淑芬)，中国科学院化学研究所(李平) |
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| 摘 要： | 研究了八甲基环四硅氧烷(D_4)在十二烷基二甲基苄基卤化铵及碱存在下乳液聚合的反应机理。聚合分二步进行:D_4先开环生成具有端羟基的聚二甲基硅氧烷,然后再缩合。反应终点有二个平衡反应;不同分子量的羟基封头的聚二甲基硅氧烷的平衡,以及羟基封头的线型聚硅氧烷和环硅氧烷的平衡。平衡时羟基封头的聚硅氧烷的量为87％并提出了主要反应位置是在胶束表面并逐渐转移到随后形成的聚合物颗粒表面,单体液滴是次要反应区。
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| 收稿时间： | 1980-04-18 |
EMULSION POLYMERIZATION OF OCTAMETHYLCYCLO-TETRASILOXANE IN THE PRESENCE OF A CATIONIC EMULSIFER |
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| Liu Shu-fen,Li Ping.EMULSION POLYMERIZATION OF OCTAMETHYLCYCLO-TETRASILOXANE IN THE PRESENCE OF A CATIONIC EMULSIFER[J].Acta Polymerica Sinica,1981,0(4):257-262. |
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| Authors: | Liu Shu-fen Li Ping |
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| Institution: | Institute of Chemistry; Academia Sinica |
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| Abstract: | The emulsion polymerization of octamethylcyclotetrasiloxane in the presence of do-decyldimethylbenzyl ammonium halide and various alkalies were studied. The polymerization proceeds in two steps, the openning of D4 with formation of OH-ended poly-dimethylsiloxanes and the condensation of the latter. At the end of the reactions equilibriums are established between OH-ended-polydimethylsioxanes of various molecular weights, and also between OH-ended polysiloxanes and cyclosiloxanes. In equilibrium the OH-ended polysiloxanes amouts to about 87%. |
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