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
来源：
POLYMER BULLETIN | 1988年 / 20卷 / 05期
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
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