以新癸酸钕/正丁基锂/氯化二乙基铝催化体系合成聚丁二烯

摘要

The polymerization of butadiene was carried out in cyclohexane with neodymium versatate (simplied as Nd)-butyllithium (simplied as Li)/diethylaluminum chloride (simplied as Al) catalyst.The effects of polymerization temperature,c(Li)/c(Nd) and c(Al)/c(Nd),and the type of alkylaluminum compound on the polymerization were investigated.The results showed that the highest catalyst activity was obtained at c(Li)/c(Nd) and c(Al)/c(Nd) of 12 and 15,respectively,and the polymer yield reached 100％.The produced polymer at low temperature of 0 ℃ had high cis1,4-unit mole content of 97.6％ and narrow molecular weight distribution of 1.23.The increase of polymerization temperature led to the increase of catalyst activity and the decrease of molecular weight and cis-1,4-unit mole content of the polymer.%以新癸酸钕(简称Nd)/正丁基锂(简称Li)/氯化二乙基铝(简称Al)为催化剂进行丁二烯聚合,考察了聚合温度、催化剂配制时c(Li)/c(Nd)和c(Al)/c(Nd)以及烷基铝种类对丁二烯聚合的影响.结果表明,在c(Li)/c(Nd)为12、c(Al)/c(Nd)为15左右时催化剂具有最高的催化活性,聚合物收率可达100％.在0℃,c(Li)/c(Nd)为12、c(Al)/c(Nd)为15的条件下,可以得到具有高顺式-1,4-结构(摩尔含量97.6％)、窄分子量分布(分子量分布指数1.23)的聚合物.随聚合温度升高,催化体系的活性提高,所得聚合物的相对分子质量和顺式-1,4-结构摩尔含量降低.