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

Synthesis of polybutadiene with neodymium versatate/n-butyllithium/diethylaluminum chloride catalyst

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。

The polymerization of butadiene was carried out in cyclohexane with neodymium versatate （simplied as Nd）/ n-butyllithium （simplied as Li ）/diethylaluminum chloride （ simplied as A1） catalyst. The effects of polymerization tem- perature, c（Li）/c（Nd） and c（A1）/c（Nd）, and the type of alkylaluminum compound on the polymerization were investi- gated. The results showed that the highest catalyst activity was obtained at c（ Li）/c（Nd） and c（ A1）/c（Nd） of 12 and 15, respectively, and the polymer yield reached 100%. The produced polymer at low temperature of 0 ℃ had high c/s- 1,4-unit mole content of 97.6% and narrow molecular weight distribution of 1.23. The increase of polymerization tempera- ture led to the increase of catalyst activity and the decrease of molecular weight and cis-1,4-unit mole content of the polymer.