Abstract
The solution and micellar polymerizations of acrylamide (Aam) initiated by the photoinitiator DAROCUR 2959 (DAR) under UV-light were studied. Variations of kinetic parameters with DAR and AAm concentrations and with the emulsifier type were followed. Furthermore, the kinetics of AAm polymerization under argon and air atmosphere was investigated. Dilatometry was implemented to follow continuously the fast photopolymerization. The polymerization rate vs. conversion curve of the photoinduced polymerization of AAm was described by two and four nonstationary rate intervals. Variation of the rate of polymerization with conversion was discussed in terms of two types of initiating radicals and the gel effect. They are formed by the decomposition of excited DAR* {DAR…AAm}* or {DAR…O2}* exciplexes. The intra- and intermolecular association of polyAAm, the self-assembling of AAm monomers, and the association of PAAm with Aam and cross-linking change the solution polymerization into the dispersion one.
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