Propylene Polymerization with Unbridged Metallocenes: Ligand Effects on the Selectivity for Elastomeric Polypropylene
作者:Jennifer L. Maciejewski Petoff、Michael D. Bruce、Robert M. Waymouth、Athar Masood、Tapan K. Lal、Roger W. Quan、Steven J. Behrend
DOI:10.1021/om9706119
日期:1997.12.1
elastomeric polypropylene with a stereoblock microstructure. In an effort to experimentally explore the importance of the 2-arylindene ligand in producing these materials, a series of catalysts was investigated that differed significantly from the parent ligand architecture. In particular, we sought to examine the influence of ligand aryl stacking on the polymerization behavior of these metallocenes. We discovered
由甲基铝氧烷活化的双(2-芳基茚基)二氯化锆可生产具有立体嵌段微结构的弹性聚丙烯。为了通过实验探索2-芳基茚配体在生产这些材料中的重要性,研究了一系列与母体配体结构显着不同的催化剂。特别地,我们试图检验配体芳基堆积对这些茂金属的聚合行为的影响。我们发现,双(2-芳基茚基)骨架对于通过这种类型的未桥连配合物生产弹性聚丙烯是重要的。基本催化剂结构的微小变化破坏了配体旋转和单体插入之间的微妙平衡,从而导致了无定形聚合物的产生。