以ZnEt_2为调节剂的阴离子聚合合成聚丁二烯的研究（Ⅱ）

A STUDY ON ANIONIC POLYMERIZATION OF BUTADIENE WITH DIETHYLZINC MODIFIER(Ⅱ)

丁二烯在ｎ－ＢｕＬｉ或ｎ－ＢｕＬｉ／２Ｇ引发的阴离子聚合体系中，以环已烷为溶剂，在不同程度下，研究添加ＺｎＥｔ２调节剂对聚丁二烯结构的影响。结果表明：在ｎ－ＢｕＬｉ引发体系中，ＺｎＥｔ２的加入对聚合物的微观结构含量、分子量及分子量分布无影响。在ｎ－ＢｕＬｉ／２Ｇ引发体系中，ＺｕＥｔ２的加入导致聚合物的１，２－结构含量及分子量下降，但不影响聚合物的立构规整性和序列分布。

The effect of modifier ZhEt2 with n-BuLi or n-BuLi/2G in cyclohexane at different temperatures on anionic polymerization of butadiene was investigated.The experiments show that ZnEt2 has no effect on mecrostructure,molecular weight and its distribution of polybutadiene,but the addition of ZnEt2 to n-BuLi-2G system can decrease 1,2-butadiene content and molecular weight of polybutadiene,and yet doesn't influence its stereoregularity and sequence distribution.