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Synthesis of Polyolefins Containing Silacycloalkane Units in the Main Chain, 1

✍ Scribed by Naofumi Naga

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
135 KB
Volume
206
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

Summary: Copolymerizations of ethylene and disubstituted diallylsilanes (CH~2~CHCH~2~)~2~R~2~Si (R = CH~3~, C~6~H~5~) have been investigated with various zirconocene catalysts using methylaluminoxane as a cocatalyst. The bridged stereospecific catalysts showed a higher reactivity for disubstituted diallylsilanes than the non‐bridged aspecific catalysts. Disubstituted diallylsilanes were incorporated into the polymer chain via cyclization insertion preferentially, and formed 3,5‐disubstituted silacyclohexane units in the polyethylene main chain. A zirconocene catalyst, dimethylsilylenebis(indenyl)zirconium dichloride, produced a copolymer containing pendant allyl groups derived from the 1,2‐insertion of diallyldiphenylsilane without cyclization.
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