摘要
以磷酸三丁酯取代的五氯化钼(简称Mo)及间甲酚取代的三异丁基铝(简称Al)为催化剂引发异戊二烯(Ip)聚合,考察了n(Mo):n(Ip)、n(Al):n(Mo)及聚合温度对单体转化率和催化剂效率的影响。采用FTIR和1H-NMR对聚合产物的微观结构进行测试表征,用DSC测定聚合产物的玻璃化转变温度(Tg);结果表明在反应温度为50℃、n(Mo):n(Ip)为4.0×10-4、n(Al):n(Mo)为30、聚合24h所得的聚异戊二烯(PIp)中1,4-结构摩尔分数为55.7%,3,4-结构的为22.5%和1,2-结构的为21.8%,该PIp的Tg为-35.1℃。
The polymerization of isoprene was initiated using tributyl phosphate substituted molybdenum pentachloride(Mo for short) and m-cresol substituted triisobutyl aluminum(Al for short) as catalysts. The influence of n(Mo):n(Ip), n(A1):n(Mo) and the polymerization temperature on the monomer conversion and catalyst efficiency was investigated. The microstructures of polymerization products were identified and characterized by FT-IR and 1H-NMR. The glass transition temperatures(Tg) of the polymerization products were determined by DSC. The results show that the obtained polyisoprene(PIp)contains 1,4-isomer of molar fraction 55.7%, 3,4-isomer of 22.5%, 1,2-isomer of 21.8%, and its Tg is -35.1 ℃when the reaction temperature is 50℃, n(Mo): n(Ip)=4.0 ×10^-4, n(Al): n(Mo)=30, and polymerization time is 24h.
出处
《化学推进剂与高分子材料》
CAS
2010年第2期52-54,64,共4页
Chemical Propellants & Polymeric Materials
基金
国家自然科学基金资助项目(20674042)
关键词
钼系催化剂
三异丁基铝
异戊二烯
配位聚合
结构表征
molybdenum series catalyst
triisobutyl aluminum
isoprene
coordination polymerization
structure characterization
作者简介
作者简介:王鹏(1984-),男,硕士研究生,主要从事二烯烃的聚合研究。电子信箱:qustwzs@126.com