Abstract
Three dyed organic pigments of the quinone, acridone and phthalocyanine series have been investigated for their usage as heterogeneous photo-initiators in vinyl polymerizations. Using surfactants, the pigments formed sols in aqueous solutions of acrylamide. By irradiation in the presence of typical reductants or oxidants for excited dye molecules, polymers are formed without any fading of the pigments. Compared with homogeneous photo-initiators, the polymerization quantum yields of these heterogeneous photo-initiators are low. The results of kinetic measurements and flash photolysis experiments of homogeneous solutions of the quinone pigment suggest photo-induced electron transfer processes as key steps of the polymerization initiation. An unusual monomer exponent of 2.1 has been found.
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