Abstract
The rate of photopolymerization of methyl methacrylate (MMA) intiated by phenanthrene quinone (PQ, light absorbing initiator) increases when arene onium salts (co-initiators, Ar 3S +, Ar 2I +, ArN 2 +) are added. By means of flash photolysis studies and quantum yield measurements in dependence on onium salt, MMA and hydrogen donor concentrations, a mechanism of this reaction was deduced. The main effect on photopolymerization rate is caused by oxidation of the inhibiting nucleophilic initiator radicals (semiquinone or semiquinone anion radicals, radical adducts of PQ to MMA) by arene onium salts to give reactive arene radicals which initiate MMA polymerization. At higher co-initiator concentrations, the reaction of exciten PQ singlet state with the onium compounds is probable.
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