Hafnium Amidoquinoline Complexes: Highly Active Olefin Polymerization Catalysts with Ultrahigh Molecular Weight Capacity
作者:Philip P. Fontaine、Jerzy Klosin、Nolan T. McDougal
DOI:10.1021/om3005417
日期:2012.9.10
metal center. The complexes were evaluated in an ethylene/1-octene copolymerization study and were found to be highly active at elevated temperatures (120 °C). The best catalyst, derived from ((2,6-dimethylphenyl)(2,4-dimethylquinolin-8-yl)amino)tribenzylhafnium (6d), compares favorably to previously reported systems supported by bidentate nitrogen-based ligands. In particular, this catalyst exhibits
描述了新型聚烯烃前催化剂的制备和表征。由酰胺基喹啉配体负载的三苄基pro原催化剂是由市售材料分两步制备的。通过单晶X射线分析确定的固态结构表明,所有the配合物在金属中心周围都显示出近似的三角双锥体几何形状。在乙烯/ 1-辛烯共聚研究中评估了该配合物,发现该配合物在高温(120°C)下具有高活性。最好的催化剂,衍生自((2,6-二甲基苯基)(2,4-二甲基喹啉-8-基)氨基)三苄基((6d),比以前报道的双齿氮基配体支持的系统优越。特别地,该催化剂表现出非常高的分子量容量和高催化活性,具有适度的1-辛烯响应。已发现,在喹啉基氮的邻位碳上的烷基取代是改善聚合物组成均匀性的重要因素,这由所得共聚物的多分散指数变窄和单一熔融温度证明。