磷酸酯钕系催化剂合成窄分子量分布高顺式聚异戊二烯  

Synthesis of high cis-1,4 polyisoprene having narrow molecular weight distribution with Nd(P_(507))_3/AlH(i-Bu)_2/AlEt_2Cl catalyst

作　　者：孔春丽[1] 胡雁鸣[1] 李杨[1] 于晓燕[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》2012年第3期187-191,共5页China Synthetic Rubber Industry

基　　金：国家自然科学基金资助项目(20974016)

摘　　要：以2-乙基己基磷酸单2-乙基己基酯钕盐(简称Nd)/氢化二异丁基铝(简称Al)/一氯二乙基铝(简称Cl)为催化剂,对异戊二烯(Ip)进行聚合,考察了催化剂配制条件和聚合温度对聚合的影响,并通过傅里叶变换红外光谱和核磁共振表征了聚合物的微观结构。结果表明,催化剂配制过程中,c(Ip)/c(Nd)越大,陈化温度越高,聚合物的分子量分布越窄;陈化温度越高,陈化时间越长,聚合物的数均分子量(M珚n)越大;c(Al)/c(Nd)越大,聚合物的M珚n越小,分子量分布越宽;聚合温度越高,聚合物的M珚n也越小,但分子量分布基本不变,其值为2.0～2.2;聚合物的顺式-1,4-结构摩尔分数基本不受反应条件的影响,为95.5%～97.1%。Effects of catalyst aging conditions and polymerization temperature were investigated in isoprene（Ip） polymerization by using neodymium tris（2-ethyl hexylphosphic mono-2-ethylhexyl easter）（simplified as Nd）/diisobutyl aluminum hydride（simplified as Al）/diethylaluminum chloride（simplified as Cl） catalyst.Microstructures of the polymers were determined by Fourier transform infrared spectroscopy and nuclear magnetic resonance.The results showed that high c（Ip）/c（Nd） and high aging temperature resulted in narrow molecular weight distribution（w/n）of the polymer;high aging temperature and long aging time resulted in large number-average molecular weight（n） of the polymer;high c（Al）/c（Nd） ratio resulted in small n and broad w/n;high polymerization temperature resulted in small n of polymer,while the w/n of the polymer almost did not change and ranged from 2.0 to 2.2.Regardless of reaction conditions,the mole fraction of cis-1,4-unit of the polyisoprene stayed in the range of 95.5%-97.1%.

关 键 词：异戊二烯 钕系催化剂 聚异戊二烯 顺式-1 4-结构 分子量分布 

分 类 号：TQ333.3[化学工程—橡胶工业]