A series of phosphine-containing cobalt complexes [CoCl2(PRPh2)2, R = Ph (1), Cy (2), nPr (3), Et (4), Me (5), H (6)] has been used for the highly active and stereospecific polymerization of 1,3-butadiene upon activation with ethylaluminum sesquichloride (EASC). The high catalytic activities and polybutadienes with high cis-1,4 selectivity were obtained in the solution polymerization in toluene. The conversion of butadiene and the microstructure and molecular weight of the resulting polymers were affected by reaction parameters and the R group on the phosphine ligand. The dispersion medium was also a sensitive factor for the current catalytic systems, influencing the catalytic activity and properties of products. In comparison with the solution polymerization in toluene, the heterogeneous polymerization in isooctane yielded slightly lower catalytic activity, cis-1,4 content and molecular weight under similar reaction conditions.
一系列含膦
钴配合物[CoCl2(PRPh2)2, R = Ph (1), Cy (2), nPr (3), Et (4), Me (5), H (6)]在
三异丁基铝(EASC)活化下,对
1,3-丁二烯进行了高活性且具有立体选择性的聚合反应。在
甲苯溶液聚合中获得了高催化活性和高顺-1,4选择性的聚
丁二烯。
丁二烯的转化率以及所得聚合物的微观结构和分子量受到反应参数和
膦配体上R基团的影响。分散介质也是当前催化体系中的敏感因素,影响催化活性和产物性质。与
甲苯溶液聚合相比,在
异辛烷中的非均相聚合在相似反应条件下产生了稍低的催化活性、顺-1,4含量和分子量。