Alternating ethylene-styrene copolymerization with a methylaluminoxane-free half-titanocene catalyst

被引：125

作者：

Pellecchia, C

Pappalardo, D

DArco, M

Zambelli, A

机构：

[1] Dipartimento di Chimica, Università di Salerno

来源：

MACROMOLECULES | 1996年 / 29卷 / 04期

关键词：

D O I：

10.1021/ma951152v

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Copolymerization of ethylene and styrene in the presence of the catalytic system eta(5)-C(5)Me(5)-Ti(CH(2)Ph)(3)-B(C6F5)(3) has been investigated. Independently from the feed composition, basically alternating ethylene-styrene copolymers are obtained, together with some polyethylene and syndiotactic polystyrene, from which the former can be separated by solvent extraction. NMR analysis of suitably C-13-enriched end groups shows that the regiospecificity of styrene insertion in the initiation step is largely secondary. A tentative explanation for the preferentially alternating comonomer incorporation is proposed.

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页码：1158 / 1162

页数：5

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