Abstract
Using methods of dilatometry and pulsed photolysis a study was made of the influence of the medium on the photopolymerization of butyl methacrylate initiated by benzophenones in the presence of amines. It was found that irrespective of the nature of the medium the photopolymerization has a free-radical character; at the same time in polar media a relationship was observed between the photopolymerization rate on the one hand, and the σ-constants of Hammett substituents in benzophenone and the ionization potential of the amine on the other hand. The photopolymerization rate was significantly reduced with increasing polarity of the medium. According to the results of the pulsed photolysis, this is attributable to a change in deactivation of the excited state of the benzophenone by the monomer.
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