Lewis酸引发的1，3－戊二烯阳离子聚合  

CATIONIC POLYMERIZATION OF 1, 3-PENTADIENEINITIATED BY LEWIS ACIDS

作　　者：刘佳林[1] 彭宇行[1] 戴汉松[1] 寸琳峰[1] 

机构地区：[1]中国科学院成都有机化学研究所

出　　处：《高分子材料科学与工程》1996年第4期63-66,共4页Polymer Materials Science & Engineering

基　　金：中国科学院留学回国人员基金

摘　　要：以ＡｌＣｌ_３、ＢＦ_３·ＯＥｔ_２、ＴｉＣｌ_４和ＡｌＢｒ_３等Ｌｅｗｉｓ酸为引发剂，在不同溶剂中（正己烷、二氯甲烷、甲苯）于３０℃引发１，３－戊二烯阳离子聚合。实验结果表明，ＡｌＣｌ_３和ＢＦ_３·ＯＥｔ_２显示出较高的催化活性，ＡｌＣｌ_３引发的聚合反应得到的聚合物具有较高的分子量，但聚合反应过程中总是伴随交联产物的生成。用甲苯作溶剂时交联反应可以被抑制。ＩＲ和￣１ＨＮＭＲ结果表明，甲苯作为聚合反应的链转移剂参与了链转移反应。Cationic polymerizations of 1,3-pentadiene (PD) were initiated by various Lewis acids such as AlCl_3 , BF_3 .OEt_2,AIBr_33 and TiCl_4 at 30℃ in n-hexane,methylene chloride and toluene respectively.All the resulting polymers gave a considerable unsaturation loss that indicates a high fraction of cyclic structure in polymer chains. The polymerizations catalysed by AlCl_3 and BFs_3·OEt_2 had relatively higher conversions. The AlCl_3-induced polymerizations in n-hexane and methylene chloride generated insoluble crosslinked products but this crosslinking reaction could be eliminated when toluene was used as solvent. IR and iH NMR evidences showed that toluene was involved in the chain transfer process and as a result p-tolyl groups have been found in the polymer.

关 键 词：阳离子聚合 戊二烯 交联反应 引发剂 电子接受体 

分 类 号：O632.14[理学—高分子化学]