在二硫化碳/正丁基锂/环己烷体系中合成高顺式聚异戊二烯  

Synthesis of high cis-polyisoprene in carbon disulfide/n-butyl lithium/cyclohexane system

作　　者：冯小玲[1] 张春庆[1] 张雪涛[1] 王玉荣[1] 李杨[1] 

机构地区：[1]大连理工大学化工学院高分子材料系,辽宁大连116012

出　　处：《合成橡胶工业》2010年第4期285-288,共4页China Synthetic Rubber Industry

基　　金：国家自然科学基金资助项目(20674007);中国石油中青年创新基金资助项目(05E7006)

摘　　要：研究了聚合温度在30～60℃,以正丁基锂为引发剂、环己烷为溶剂、二硫化碳为结构调节剂的异戊二烯负离子聚合的反应规律,以及二硫化碳用量和聚合条件对聚异戊二烯微观结构的影响。结果表明,随着异戊二烯/环己烷的增加,聚异戊二烯中的顺式-1,4-结构含量降低;随着引发剂浓度的增加,顺式-1,4-结构含量也降低;随着反应温度升高,顺式-1,4-结构含量先增加后降低;随着二硫化碳用量的增加,顺式-1,4-结构含量先增加后略有降低。在50℃、异戊二烯/环己烷(质量比)为1/9、正丁基锂/异戊二烯(摩尔比)为0.68×10-3及二硫化碳/正丁基锂(摩尔比)为0.08×10-3时可制得顺式-1,4-结构摩尔分数最高约为96%的高顺式聚异戊二烯。Anionic polymerization of isoprene using cyclohexane as solvent,CS2 as structure regulator and n-BuLi as initiator was carried out at the polymerization temperature of 30-60 ℃.The microstructures of its products were investigated and the trends of polymerization were derived.The results showed that the content of cis-1,4-unit reduced with the Ip/cyclohexane increasing;the content of cis-1,4-unit dropped with the concentration of initiator raising;the content of cis-1,4-unit increased and then decreased with the reaction temperature stepping up;the content of cis-1,4 structure raised and then a little reduced with the CS2 adding.The high cis-polyisoprene with mole fraction of cis-1,4-unit of 96.2% was obtained at n-BuLi/Ip（mole ratio） 0.68×10-3,Ip/cyclohexane（mass ratio） 1/9,CS2/n-BuLi（mole ratio） 0.08×10-3 and 50 ℃.

关 键 词：高顺式聚异戊二烯 二硫化碳 正丁基锂 负离子聚合 微观结构 

分 类 号：TQ333.3[化学工程—橡胶工业]