Abstract
The three long-wavelength photosensitive initiating systems which composed of photosensitizer 3-acetvl-7-N, N-diethylamino coumarin(C1) or 7-diethvlamino-3-(2′ -benzimidazolyl) coumarin(C2), or 7-diethylamino-3-(2′ -N-methylbenzimidazolyl) coumarin(C3) and photoinitiator 2-chlorohexaarylbiimidazole(o-Cl-HABI), and hydrogen donor coinitiator n-dodecyl mercaptan (SH) were studied. The results showed that when exposed to visible light, biimidazole and coumarin underwent electron transfer from coumrian to biimidazole and free radical was produced. The relationship between the photopolymerization rate of methyl methacrylate(MMA) and concentration of C1 and o-Cl-HABI was studied.
