Sequence and stereoselectivity of the C1-symmetric metallocene Me2Si(1-(4,7-Me2Ind))(9-Flu)ZrCl2

被引：19
|
作者：
Fan, W [1 ]
Waymouth, RM [1 ]
机构：
[1] Stanford Univ, Dept Chem, Stanford, CA 94305 USA
来源：
MACROMOLECULES | 2003年 / 36卷 / 09期
关键词：
D O I：
10.1021/ma020037z
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
The homo- and copolymerization behaviors of two C-1-symmetric metallocenes Me2Si(Ind)(9-Flu)ZrCl2 (2) and Me2Si(1-(4,7-Me(2)Ind))(9-Flu)ZrCl2 (3) in the presence of methylaluminoxane (MAO) are compared. In liquid propylene at 0 C, metallocene 2 yields a predominantly isotactic polypropylene of low tacticity ([mmmm] = 27%) where metallocene 3 produces syndiotactic polypropylene (74% [rrrr]). The stereoselectivity of metallocene 3 depends on monomer concentration: the percentage of syndiotactic pentads [rrrr] in polymers derived from 3 increases with increasing monomer concentration. Copolymerization of ethylene and propylene with metallocenes 2 and 3 yields highly alternating but atactic ethylene-propylene copolymers.
引用
收藏
页码：3010 / 3014
页数：5
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