Ethylene polymerization with ansa-metallocene systems rac-(Me(2)SiOSiMe (2))[Ind]2ZrCl2-MAO and rac-(Me(2)SiOSiMe(2))[IndH(4)]MtCl(2)-MAO; (Mt=Zr,Ti)

被引：20

作者：

Liang, B ^{[1
]}

Li, Y ^{[1
]}

Xie, GH ^{[1
]}

机构：

[1] CHINESE ACAD SCI,INST CHEM,BEIJING 100080,PEOPLES R CHINA

来源：

MACROMOLECULAR RAPID COMMUNICATIONS | 1996年 / 17卷 / 03期

关键词：

D O I：

10.1002/marc.1996.030170307

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 was polymerized in toluene using methylalumoxane (MAO) activated rac-(Me(2)SiOSiMe(2))[Ind]2ZrCl2 (1) and rac-(Me(2)SiOSiMe(2))[IndH(4)](2)MtCl(2) (Mt = Zr (2); Mt = Ti (3)). All three catalyst systems polymerize ethylene with high activity. The molecular weight of polymer produced with zirconocene (1) was up to a weight-average molecular weight <(M)over bar (w)> = 1.1 x 10(6) at low polymerization temperature (<20 degrees C) under atmospheric pressure. The titanocene catalyst 3 shows lower activity and produced lower molecular weight polyethylene than zirconocenes 1 and 2. Replacement of aromatic rings in 1 by cyclohexane rings, leading to 2, increases activity and reduces molecular weight. The catalyst systems show a dependency of the activity on temperature.

引用

页码：193 / 195

页数：3

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