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研究了在环己烷中,在极性添加剂存在下,引发剂 n-BuLi 的浓度对聚丁二烯微观结构的影响。我们发现,在纯环己烷中,随引发剂浓度的增加,聚丁二烯的1,2结构含量上升,顺-1,4与反-1,4结构含量的比例下降。在极性添加剂存在下,如果固定极性添加剂和引发剂的摩尔比不变,那么随引发剂浓度的升高1,2结构含量明显上升,一般顺-1,4与反-1,4的比例大致不变。但当引发剂的浓度很低而且极性添加剂的用量很小时,则引发剂浓度对顺-1,4/反-1,4的比例有明显影响。
The effect of the concentration of initiator n-BuLi on the microstructure of polybutadiene in cyclohexane in the presence of a polar additive was investigated. We found that the content of 1,2 in polybutadiene increased and the ratio of cis-1,4 to trans-1,4 in the pure cyclohexane increased with the increase of initiator concentration. In the presence of a polar additive, if the molar ratio of the fixed polar additive to the initiator is not changed, the content of 1,2 structure increases significantly with the increase of the initiator concentration, and the cis-1,4 and trans-1,4 The ratio remains roughly the same. However, when the initiator concentration is low and the amount of the polar additive is small, then the initiator concentration has a significant effect on the cis-1,4 / trans-1,4 ratio.