Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
The Additive Effect of Triphenylphosphine on the Polymerization of Vinyl Monomers by Copper(II) Chelates
Toshiyuki ShonoYuko YamashojiKoichiro Shinra
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1972 Volume 45 Issue 7 Pages 2007-2009

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Abstract

Various copper(II) chelates were found to be effective initiators in the polymerization reaction of the methyl methacrylate in the presence of triphenylphosphine. The conversion increases with an increase in the concentration of triphenylphosphine, reaching a constant level at the ratio of 1: 2 between copper chelates and triphenylphosphine. Di-μ-methoxo-bis(ethylacetoacetato)dicopper(II) was the most effective initiator. The dependence of the rate of the polymerization on the square root of the concentration of the complexes suggests that the polymerization by this initiation system proceeds via a radical mechanism. It can be assumed that the copper chelate coordinated the triphenylphosphine and that homolytic fission occurred to give a free ligand radical, accompanied by the reduction of the central copper atom. Stable copper (I) mixed chelates were obtained under conditions similar to those of the polymerization.

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