Abstract
The photopolymerization of methyl methacrylate in the presence of iodine and triethylamine was investigated to clarify the initiation mechanism in this system. The polymerization proceeded according to a radical mechanism. It was confirmed that triethylamine hydroiodide formed during the polymerization process did not act as a photosensitizer by itself. On the other hand the red-brown oily material, which was obtained from the mother liquor of the crystalline triethylamine hydroiodide, initiated the photopolymerization of methyl methacrylate in the presence of triethylamine or sodium thiosulfate without an induction period. The results of elementary analysis, measurements of infrared spectra, and thin-layer chromatography, suggest that the oily material contained, inter alia, N,N-diethyl-α-iodoethylamine.A graft polymer was obtained in the photopolymerization of methyl methacrylate in the presence of iodine and poly(N,N-diethylallylamine). This fact also would suggest that with irradiation by ultraviolet light the iodine–triethylamine charge-transfer complex was converted into N,N-diethyl-α-iodoethylamine, the photolysis of which provided the primary radicals to initiate the polymerization of methyl methacrylate.
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