Abstract
The rate constants for addition reactions of diphenylphosphonyl radicals (Ph 2 P=O) to vinyl monomers were measured to be on the order of 10 6 -10 7 s -1 M -1 , being 1 or 2 orders of magnitude larger than those of carbon-centered radicals, which were obtained by photolysis of benzoin, benzoin methyl ether, or 1-phenyl-2-hydroxy-2-methylpropanone-1. The fact that (2,4,6-trimethylbenzoyl)diphenylphosphine oxide (TMDPO) is a more effective initiator than AIBN was made clear in the radical polymerizations of vinyl pivalate at -30 and -70°C
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