Selective Chain Transfer Reactions in Metallocene Catalyzed Copolymerization of Ethylene with Allylbenzene

Intensive research on the polymerization of olefins with metallocene catalysts has added a great number of details to the knowledge of the mechanism of olefin insertion/termination reactions and the relationship between catalyst symmetry and polymer microstructure. An understanding of the chain term...

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Bibliographic Details
Published in:Macromolecules 2000-03, Vol.33 (6), p.1921-1923
Main Authors: Byun, Doo-Jin, Kim, Sang Youl
Format: Article
Language:English
Subjects:
Applied sciences
Copolymerization
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Preparation, kinetics, thermodynamics, mechanism and catalysts
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Summary:Intensive research on the polymerization of olefins with metallocene catalysts has added a great number of details to the knowledge of the mechanism of olefin insertion/termination reactions and the relationship between catalyst symmetry and polymer microstructure. An understanding of the chain termination is an important issue because it is critical for the control of molecular weight and chain end structure of polymers. It is known that two kinds of chain transfer reactions, beta -H elimination and chain transfer to aluminum, prevail in olefin polymerization with metallocene/MAO catalysts. Generally, chain termination via alkyl chain transfer to aluminum is described as a minor chain termination process for the metallocene-catalyzed olefin polymerization. Recently we found that chain transfer to aluminum became a major chain transfer reaction when ethylene was copolymerized with allylbenzene. In this communication, we report the copolymerization behavior of ethylene and allylbenzene with several metallocene catalysts having different ligand structures where chain transfer mode depends on the catalysts' structures.
ISSN:0024-9297
1520-5835
DOI:10.1021/ma9913459