采用Nd（P507）3（简称Nd）、氢化二异丁基铝（简称Al）、三氯甲烷（简称Cl）和三氯乙酸乙酯（简称ETCA）催化体系,以环己烷为溶剂,在苯乙烯（St）的存在下,实现丁二烯的选择性聚合。考察了[Al]/[Nd]和[Cl]/[Nd]比、St加入量、聚合温度等对聚合的影响。结果表明,在[Al]/[Nd]比为20、[Cl]/[Nd]比为10、[ETCA]/[Nd]比为1.0、聚合温度为50℃时,聚合物收率可达92%以上;所得聚丁二烯具有较高顺-1,4结构含量、窄分子量分布（-Mw/-Mn~2.0）和极低的苯乙烯链节含量（〈0.4%）。
The selective polymerization of butadiene（Bd） in the presence of styrene was carried out in cyclohexane with the rare earth catalyst comprised of Nd（P507）3（Nd）,Al（i-Bu）2H（Al）,CHCl3（Cl）,and CCl3COOCH2CH3（ETCA）.The effects of Al/Nd and Cl/Nd molar ratios,polymerization temperature,and St feed ratio on the polymerization were investigated.The results show that polymer yield is up to 92.5% at polymerization temperature of 50 ℃,Al/Nd molar ratio of 20,Cl/Nd molar ratio of 10,and ETCA/Nd molar ratio of 1.0.The produced polymers have high cis-1,4 content,narrow molecular weight distribution（w/n ～2.0）,and extremely low St content（0.4%）.
参考文献
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