摘要
研究了在15 ~30 ℃下,以正丁基锂为引发剂,环己烷为溶剂,乙醚为极性调节剂的异戊二烯负离子聚合产物的微观结构。结果表明:在同一乙醚/ 正丁基锂摩尔比值下, 随聚合温度升高,试样的3 ,4 - 结构摩尔分数降低;在同一温度下,随乙醚用量的增加,3 ,4 - 结构摩尔分数增加;以乙醚为极性添加剂时,聚合物分子链上含有3 ,4 - 和1 ,4 - 结构, 不含1 ,2 - 结构; 以乙醚为溶剂时, 聚合物分子链上含有3 ,4 - 、1 ,4 - 及1 ,2 - 结构。此外,还建立了2 个微观结构摩尔分数与乙醚用量间的定量关系式,求得了综合平衡常数、络合指数和综合活化能。
Anionic polymerization of isoprene using cyclohexane as solvent, Et2O as polar additive and n-BuLi as initiator was carried out and the microstructures of its product are investigated. The results showed that the mole fraction of 3,4-structure in polyisoprene decreased with increasing temperature at a certain /;the mole fraction of 3,4-structure increased with increasing the quantity of Et2O at a certain temperature; 1,2-structure was not found when Et2O was used as additive . Two quantitative relationships between the mole fraction of 3,4-structure and the mole ratio of to were derived.The complex equilibrium constant ,coordination index and complex activation energy were also obtained.
出处
《合成橡胶工业》
EI
CAS
CSCD
1999年第5期270-272,共3页
China Synthetic Rubber Industry
关键词
负离子聚合
乙醚
聚异戊二烯
结构
环己烷
isoprene
anionic polymerization
ethyl ether
polyisoprene
microstructure