磷酸酯改性钼系催化剂催化异戊二烯聚合  

Polymerization of isoprene catalyzed with phosphates-modified molybdenum system

作　　者：史先鑫[1] 龙飞[1] 华静[1] 徐玲[1] 

机构地区：[1]青岛科技大学橡塑材料与工程教育部重点实验室,山东青岛266042

出　　处：《合成橡胶工业》2013年第5期341-345,共5页China Synthetic Rubber Industry

基　　金：国家自然科学基金资助项目(50603009)

摘　　要：以磷酸二异辛酯(P204)改性的MoCl5(简称Mo)为主催化剂、间甲酚取代的三异丁基铝(简称Al)为助催化剂,催化异戊二烯(Ip)聚合,考察了催化剂用量、聚合温度、时间等对单体转化率和聚合物特性黏数的影响,并对聚合物的微观结构进行了表征。结果表明,以P204作为Mo的改性剂时,催化体系较以磷酸三丁酯和正辛醇为改性剂具有更高的活性,在P204/Mo(摩尔比)为2∶1时,单体转化率为70.9%;P204/Mo/Al体系下在Mo/Ip(摩尔比)为10×10-4、Al/Mo(摩尔比)为15、反应温度为60℃以及聚合时间为24 h的条件下,所得聚合产物主要以1,4-结构为主,其摩尔分数达到70%以上。Polyisoprene was synthesized with diisooctyl phosphate （P204）/MoCl5 （simplified as Mo） /Al（OPhCH3） （i-Bu）2 （simplified as Al） catalyst system.The effects of the catalyst amount,temperature and time on the monomer conversion and the polymer＇ s intrinsic viscosity were studied; and the microstructure of the polymer was characterized.The results showed that Mo catalyst with P204 as modifier had higher activity than those with tributyl phosphate and n-octyl alcohol as modifiers,and the conversion was 70.9％ at P204/Mo（mole ratio） 2∶ 1.The microstructure of the polymerization product catalyzed with P204/Mo/Al system was mainly 1,4-unit,and its mole fraction was more than 70％ at Mo/Ip（mole ratio） 10 × 10-4,Al/Mo（mole ratio） 15,reaction temperature 60 ℃ and polymerization time 24 h.

关 键 词：聚异戊二烯 五氯化钼 磷酸二异辛酯 转化率 特性黏数 微观结构 

分 类 号：TQ333.3[化学工程—橡胶工业]