摘要
采用新型稀土催化体系Ｌ＿３－ｎＬｎＸ＿ｎ－Ｒ＿３Ａｌ－Ｒ｀Ｘ，研究了催化体系各组分、室温下再陈化时间、ＲＸ和Ｒ＿３Ａｌ种类及用量、溶剂种类等因素对异戊二烯聚合的影响。在此基础上，经环化聚合合成出环化聚异戊二烯，并尝试了异戊二烯的立构嵌段聚合，用ＩＲ、ＮＭＲ及动态力学测试等方法表征了聚合物的结构。合成出含１，４－结构６８．２％含环化结构约２８．９％，顺－１，４和反－１，４链段的Ｔｇ分别为－２９℃和７０℃的顺反立构嵌段聚异戊二烯。
Using a novel catalyst system L3-n LnXn/R3Al/R` X,the effects of the components, reaging time,third compnents.aluminum alkyls and solvents on the polymerization of isoprene were studied.Then the cyclopolyisoprene was synthesized by cyclopolymerization. The stereoblock polymerization of isoprene was first carried out successfully The alleged polymer was characterized by IR, NMR and dynamic mechanical analysis the isoprene stereoblock polymer was obtained with 1.4-content 68.2%,cyclic structure 28.9%,and glass-transition temperatures-29℃ and 70℃ of cis-and trans-1,4-chain Segment respectively.
出处
《合成橡胶工业》
CAS
CSCD
北大核心
1996年第6期350-354,共5页
China Synthetic Rubber Industry
基金
国家自然科学基金
北京燕山石油化工公司资助
关键词
催化剂
聚合
环化聚合
聚异戊二烯
稀土族
橡胶
rare earth catalyst
isoprene
polymerization
stereoblock polymerization
cyclopolymeriza tion
