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Synthesis and Characterization of Long-Chain-Branched Polyolefins with Metallocene Catalysts: Copolymerization of Ethylene with Poly(ethylene-co-propylene) Macromonomer

✍ Scribed by Edward Kolodka; Wen-Jun Wang; Shiping Zhu; Archie Hamielec

Publisher
John Wiley and Sons
Year
2003
Tongue
English
Weight
75 KB
Volume
24
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

Poly(ethylene‐co‐propylene) macromonomer (EPM) was synthesized in a high‐temperature continuous stirred tank reactor (CSTR) with [C~5~Me~4~(SiMe~2~N^t^Bu)]TiMe~2~ (CGC‐Ti) as the catalyst system. PE samples with EPM long chain branching (LCB) were produced by semi‐batch copolymerization of ethylene and EPM with CGC‐Ti. The LCB frequencies were up to 21.8 EPM side chains per PE backbone. The effects of temperature and ethylene pressure on the degree of EPM grafting and catalyst activity were examined.

Incorporation of EPM into a growing PE chain forming an LCB polymer.

magnified imageIncorporation of EPM into a growing PE chain forming an LCB polymer.

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