Propylene copolymerization with non-conjugated dienes and a-olefins using supported metallocene catalyst

Propylene was copolymerized with 7-methyl-1.6-octadiene, 1,9-decadiene and *a-olefins using dimethylsilanyl-bis(2-methyl-4-phenyl-1-indenyl)zirconium dichloride supported on methylaluminoxane modified silica. Additional methylaluminoxane was needed to activate the catalyst. Comonomer incorporations...

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Bibliographic Details
Published in:Polymer (Guilford) 2004-03, Vol.45 (7), p.2099-2110.
Main Authors: Paavola, Santefi, Saarinen, Tapio, Lofgren, Barbro, Pitkanen, Paivi
Format: Article
Language:English
Online Access:Get full text
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Summary:Propylene was copolymerized with 7-methyl-1.6-octadiene, 1,9-decadiene and *a-olefins using dimethylsilanyl-bis(2-methyl-4-phenyl-1-indenyl)zirconium dichloride supported on methylaluminoxane modified silica. Additional methylaluminoxane was needed to activate the catalyst. Comonomer incorporations were 1.5 mol% or less. In propylene /7-methyl-1,6-octadiene copolymers there was no indication of long-chain branching and molar masses were low. Adding a small amount of 1,9-decadiene caused very high molar masses and broad molar mass distributions. A possible long-chain branching in propylene/1,9-decadiene copolymers was evaluated by stress-controlled dynamic rheometer. Changed rheological behavior and especially raised Arrhenius-type flow activation energy along with change in polymer properties indicated long-chain branching in propylene/1,9-decadiene copolymers.
ISSN:0032-3861
DOI:10.1016/j.polymer.2004.01.053