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Photochemical generation of free radicals and acids is a widely used process in photopolymerization reactions. Recently, photobase generators (PBG) systems have emerged as new source of initiating species allowing the catalysis of different reactions (thiol-Michael, thiol-isocyanate, thiol-epoxy…). In this study, a photoinitiating system composed of a sensitizer (isopropylthioxanthone, ITX) and a photobase generator (triazabicyclodecene tetraphenylborate TBD.HBPh4) was successfully applied to the photopolymerization of a thiol-isocyanate mixture. Polythiourethane networks are relatively poorly investigated in the literature and almost no information is available dealing with their photochemical formation. In this study, photopolymerization kinetics and mechanical properties of polythiourethane were analyzed by combining NMR, spectroscopic (RT-FTIR) and mechanical measurement techniques. From the results, it turns out that the high reactivity and interesting mechanical properties of polythiourethane network could be of great interest for the development of new materials for coatings.
