Abstract
In aqueous solution, acrylamide can undergo free radical polymerization by the interaction of light with several sulphonated aromatic ketones. In the presence of diphenyliodonium hydrogensulphate, this effect is enhanced substantially. The relevant initiation and termination processes are discussed in detail using kinetic modelling. According to their photochemistry, the individual ketones react preferentially either from the excited singlet or triplet state. The initiation efficiencies correlate with the quantum yields of iodonium salt or ketone decomposition; in the case of triplet reactions, those processes occur with very high values. Participation of 1,4-biradicals formed in the triplet quenching reaction with acrylamide is discussed. For thioxanthone-2,7-disulphonate, that path is demonstrated by the kinetic results. At higher concentrations, the diphenyliodonium ion becomes a chain termination and transfer agent.
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