Role of post-polymerization in the curing of photopolymerizable composition under the influence of pulsed radiation

The effect of post-polymerization for photopolymerizable composition based on oligoester methacrylate OCM-2 was studied using IR spectroscopy. Numerical simulation of this process was carried out within the framework of a kinetic model that takes into account changes in the concentration of both the monomer and radicals of growth. It was demonstrated that the increase in conversion due to the post-polymerization depends on the concentration and lifetime of radicals, as well as the ratio of the light pulses length to the repetition period. The influence of post-polymerization on the exposure characteristics of the polymerization process is considered for the cases of exposure to single radiation pulses (scanning lithography) and photoiniation by a periodic sequence of light pulses (using pulse-width modulation of semiconductor light sources).