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Living polymerization of substituted acetylenes by a novel ternary catalyst, MoOCl4Et2ZnEtOH

✍ Scribed by Shigetaka Hayano; Toshio Masuda

Publisher: John Wiley and Sons
Year: 1997
Tongue: English
Weight: 356 KB
Volume: 198
Category: Article
ISSN: 1022-1352
DOI: 10.1002/macp.1997.021981005

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✦ Synopsis

Abstract

A novel molybdenum oxytetrachloride (MoOCl~4~)‐based ternary catalyst, molybdenum oxytetrachloride/diethylzinc/ethanol (MoOCl~4~Et~2~ZnEtOH), induces the living polymerization of o‐(trifluoromethyl)phenylacetylene. A catalyst composition of MoOCl~4~:Et~2~Zn: EtOH (mole ratio = 1:1:3) and anisole as polymerization solvent are favorable. The ratio of weight‐ to number‐average molecular weights M~w~/M~n~ of the polymer was as small as 1,03, and the initiator efficiency was 8%. Living polymerization was verified by multistage polymerization. The polymerization proceeded in a living fashion in the temperature range from 0 to 30°C. The catalyst yielded polymers with small M~w~/M~n~ values also from other phenylacetylenes with bulky ortho substituents and 1‐chloro‐1‐octyne.

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