A COMPARISON OF CP2HFCL2 VERSUS CP2ZRCL2 METHYLALUMOXANE CATALYSTS

被引:43
作者
MALLIN, DT [1 ]
RAUSCH, MD [1 ]
CHIEN, JCW [1 ]
机构
[1] UNIV MASSACHUSETTS,DEPT POLYMER SCI & ENGN,AMHERST,MA 01003
关键词
Ethylene--Polymerization - Olefins--Polymerization - Polymerization--Catalysts - Transition Metals--Concentration;
D O I
10.1007/BF01153432
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Ethylene polymerizations by Cp2ZrCl2/MAO (MAO = methylalumoxane) and Cp2HfCl2/MAO catalysts are compared. The Hf catalysts have about two-thirds the activity of the Zr catalysts. This difference may be attributed to the greater number of active centers present in the Zr catalyst. The Hf catalyst shows a smaller dependence of: (1) polymer MW on temperature and (2) polymerization activity on transition metal concentration than the Zr catalyst.
引用
收藏
页码:421 / 425
页数:5
相关论文
共 14 条