过去的工作已经表明,在以稀土催化体系进行丁二烯—异戊二烯共聚合时,Al(i-C_4H_9)_3中的Al(i-C_4H_9)_2H含量增大,不仅可提高共聚合活性,而且对共聚物的分子量和分子量分布均能产生显著影响。因此,仔细研究丁二烯和异戊二烯在Ln Previous work has shown that the addition of Al (i-C_4H_9) _2H in Al (i-C_4H_9) _3 increases the copolymerization activity when butadiene-isoprene is copolymerized with a rare earth catalyst , But also have a significant impact on the molecular weight and molecular weight distribution of the copolymer. Therefore, a careful study of butadiene and isoprene in Ln