Propene polymerization with zirconocene catalysts supported on siloxane copolymers

A supported version of zirconocene catalysts on siloxane copolymers having 1,2,3,4‐tetramethylcyclopentadienyl (Cp″)‐fluorenyl (Flu) (I) or cyclopentadienyl (Cp)‐fluorenyl (II) groups as substituents was prepared and applied to propene polymerization using methylalumoxane (MAO) or [Ph3C][B(C6F5)4] a...

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Published in:Macromolecular chemistry and physics 1997-09, Vol.198 (9), p.2779-2787
Main Authors: Soga, Kazuo, Ban, Hoang The, Arai, Takashi, Uozumi, Toshiya
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Polymerization
Preparation, kinetics, thermodynamics, mechanism and catalysts
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cited_by cdi_FETCH-LOGICAL-c3690-de576e55fb079c505b388dce2b8c884a9d7af0856df641ef7840b30745c4a7c93
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creator Soga, Kazuo
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description A supported version of zirconocene catalysts on siloxane copolymers having 1,2,3,4‐tetramethylcyclopentadienyl (Cp″)‐fluorenyl (Flu) (I) or cyclopentadienyl (Cp)‐fluorenyl (II) groups as substituents was prepared and applied to propene polymerization using methylalumoxane (MAO) or [Ph3C][B(C6F5)4] as cocatalyst. Catalyst (I), which was soluble in toluene, exhibited very low activity, whereas catalyst (II), which was composed of a toluene soluble (Cat‐A) and an insoluble fraction (Cat‐B), displayed a fairly high activity. Both catalysts (A and B) give a mixture of syndiotactic, atactic and a small quantity of isotactic polypropene, with a fraction of syndiotactic pentads ranging from about 50–75%. In contrast, the corresponding non‐supported catalyst gives almost completely atactic polypropene.
doi_str_mv 10.1002/macp.1997.021980910
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subjects Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Polymerization
Preparation, kinetics, thermodynamics, mechanism and catalysts
title Propene polymerization with zirconocene catalysts supported on siloxane copolymers
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