A novel binary photosensitization system composed of benzophenone （BP）/diphenyliodonium chloride （DPIOC） Ariethylamine （TEA）, exhibiting a good photoresponse at near UV and visible light regions, was used as the initiator for photopolymerization of MMA. The radical photogeneration in the binary system consists mainly of two parallel reactions, i. e. , BP/TEA photohydrogen-abstraction and DPIOC/TEA complex photodecomposition, but the latter is more active than the former. The results of comparative study indicate that the rate of polymerization induced by the binary system （BDT）is remarkably higher than those by the corresponding single systems The polymerization rates are proportional to [BP]0.16, [DPIOC]0.32 [TEA]0.45 and [MMA]. The mechanism is also discussed.
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