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OALib Journal期刊
ISSN: 2333-9721
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用甲基铝氧烷活化的氯化稀土催化剂合成高顺式窄分布聚丁二烯
DOI: 10.3724/SP.J.1105.2013.12117, PP. 36-42
Keywords: 氯化稀土催化剂,甲基铝氧烷,高顺式聚丁二烯,窄分子量分布
Abstract:
以NdCl3·4L(配体L为膦酸三丁酯TBP、膦酸三苯酯TPP、膦酸二异辛酯P204)为主催化剂(简称［Nd］)、甲基铝氧烷(MAO,简称［Al］)为助催化剂和环己烷为溶剂,进行1,3-丁二烯聚合的研究.考察了配体对丁二烯聚合反应活性的规律及MAO用量、催化剂陈化时间、溶剂种类对聚合的影响;并对聚合物进行NMR,IR和GPC的表征.结果表明,3种配体的聚合活性顺序为TBP>P204>TPP;当［Al］/［Nd］为30时,聚合物的分子量分布指数达到1.20;30℃陈化时,聚丁二烯cis-1,4结构均大于97%;与正己烷、甲苯溶剂对比来看,环己烷体系所得聚合产物的分子量分布相对较窄、产率较高.
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