Furyl‐Substituted Group‐4 Metallocene Catalysts for Elastomeric Polypropylene Formation—The Role of the Remote Substituents
作者:Thorsten Dreier、Gerhard Erker
DOI:10.1560/8u5j-d3cg-hhft-1312
日期:2002.12
n-octyl (5f), tert-butyl (5g)], as well as the corresponding benzofuryl (5h) and 4,5-dimethylfuryl (5i) complexes. Their treatment with methylalumoxane (>1000-fold excess) generated active homogeneous Ziegler-Natta polymerization catalysts. Propene polymerization at temperatures between −20 °C and +20 °C gave elastomeric polypropylenes. The elastomeric features were characterized by stress/strain curves
用正丁基锂处理一系列的2-烷基呋喃(1)和相关体系,然后将所得的硫代呋喃添加到2-茚满酮中,H 3 O +催化的消除,去质子化,以及过渡金属化成四氯化锆,得到一系列不同取代的双[(5-烷基-2-呋喃基)茚基] ZrCl 2络合物[烷基=正丁基(5d),正己基(5e),正辛基(5f),叔丁基(5g)],以及相应的苯并呋喃基(5h)和4,5-二甲基呋喃基(5i)配合物。用甲基铝氧烷(> 1000倍过量)处理生成了活性均相的齐格勒-纳塔聚合催化剂。在-20℃至+ 20℃之间的丙烯聚合产生弹性体聚丙烯。弹性体特征由应力/应变曲线表征,其显示出对弯曲金属茂配合物外围的呋喃环处连接的实际烷基取代基的显着依赖性。这些取代基在催化剂骨架上的空间体积增加似乎导致等规度增加,并且相应地改善了由这些体系获得的聚合物的弹性体性能。