摘要
以钛酸丁酯[Ti（C4H9O）4]和TiCl4／MgCl2（简称Ti）为主催化剂、三异丁基铝（简称A1）为助催化刺催化异戊二烯（Ip）聚合，考察了Ti（C4H9O）4和A1用量对聚合物在汽油中可溶性及单体转化率、催化效率（CE）的影响，并对聚合物进行了表征。结果表明，当Ti／Ip（摩尔比）一定时，聚合物在汽油中的溶解度随着Ti（C4H9O）4／Ip（摩尔比）的增加而增大，Ti（C4H9O）4／Ip为3×10^-3时，单体转化率达到最大值；当主催化剂配比及用量一定时，聚合物在汽油中的溶解度随着A1／Ti（C4H9O）4（摩尔比）的增加先增大后减小，当A1／Ti（C4H9O）4为10-15时，单体转化率和CE存在最大值；该催化体系制得的聚异戊二烯以反式-1，4-结构为主，同时包含一定量的3，4-和1，2-结构。
Isoprene （Ip） was polymerized with tetrabutyl titanate,supported titanium catalyst （ simpli- fied as Ti） as main catalyst and triisobutylaluminium （simplified as A1） as promoter. The effects of tetra-butyl titanate and A1 dosage on the solubility of polymer in gasoline, conversion and catalyst efficiency （CE） were investigated, and the structure of polymer was characterized. The results showed that when Ti/Ip （mole ratio）was fixed, with increasing Ti（C4H9O）4/Ip（mole ratio） , the gasoline dissolvable part in polymer increased, and the conversion of Ip reached the highest value when Ti （C4H9O）4/Ip was 3×10^-3. When the main catalyst dosage was fixed, with increasing A1/Ti （C4H9O）4 （mole ratio）, the gasoline dissolvable part in polymer increased at first and then decreased, and both conversion and CE reached the highest value at AI/Ti（C4H9O）4 of 10-15. The structure of polyisoprene based on the title catalyst system was minaly trans-1,4-units, and also contains some 3, 4-units and 1, 2-units.
出处
《合成橡胶工业》
CAS
CSCD
2009年第6期476-479,共4页
China Synthetic Rubber Industry
基金
国家自然科学基金资助项目(20674042)
关键词
负载钛
钛酸丁酯
三异丁基铝
异戊二烯
聚合
结构
supported titanium catalyst
tetrabutyl titanate
triisobutylaluminium
isoprene
poly-merization
structure
