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Structure of chain-ends in polybutadiene produced with the CoBr2(PPh3)2/MgCl2/SiPh2(OCH3)2-Al(CH3)3 catalyst system

✍ Scribed by Masaki Takeuchi; Takeshi Shiono; Kazuo Soga

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
266 KB
Volume
16
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

Polymerization of 1,3‐butadiene with the CoBr~2~(PPh~3~)~2~/MgCl~2~/SiPh~2~(OCH~3~)~2~‐Al(CH~3~)~3~ catalyst system was conducted in the presence of ethylene. It was found that addition of ethylene causes a marked decrease in the molecular weight of polybutadiene although ethylene is not incorporated at the chain‐end. The structure of chain‐ends was analyzed using very low molecular‐weight polybutadiene produced in the presence of ethylene, which led to the conclusion that 1,2 and 2,1 insertion reactions predominate at the initiation and propagation steps, respectively.

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