Wavelength-Selective Sequential Polymer Network Formation Controlled with a Two-Color Responsive Initiation System
TL;DR: By demonstrating complete light control in another sequential polymerization system (thiol-Michael and thiol-ene hybrid polymerization), this initiator pair exhibits great potential to regulate many other coupled anion and radical hybrid polymerizations in both a sequential and controllable manner.
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Abstract: We report a wavelength-selective polymerization process controlled by visible/UV light, whereby a base is generated for anion-mediated thiol–Michael polymerization reaction upon exposure at one wavelength (400–500 nm), while radicals are subsequently generated for a second stage radical polymerization at a second, independent wavelength (365 nm). Dual wavelength, light controlled sequential polymerization not only provides a relatively soft intermediate polymer that facilitates optimum processing and modification under visible light exposure but also enables a highly cross-linked, rigid final material after the UV-induced second stage radical polymerization. A photobase generator, NPPOC-TMG, and a photo-radical initiator, Irgacure 2959, were selected as the appropriate initiator pair for sequential thiol–Michael polymerization and acrylate homopolymerization. FT-IR and rheological tests were utilized to monitor the dual cure photopolymerization process, and mechanical performance of the polymer was charac...
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