1972 Volume 45 Issue 7 Pages 2007-2009
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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