Abstract
A visible-light (470 nm wavelength) sensitive Type II photoinitiator system is developed for bulk Cu(i)-catalyzed azide-alkyne cycloaddition (CuAAC) reactions in crosslinked networks. The accelerated photopolymerization eliminates UV-mediated azide decomposition allowing for the formation of defect-free glassy networks which exhibit a narrow glass transition temperature.
Highlights
A visible-light (470 nm wavelength) sensitive Type II photoinitiator system is developed for bulk Cu(I)-catalyzed azide–alkyne cycloaddition (CuAAC) reactions in crosslinked networks
The accelerated photopolymerization eliminates UV-mediated azide decomposition allowing for the formation of defect-free glassy networks which exhibit a narrow glass transition temperature
In the photo-CuAAC reaction, Cu(II) is reduced through a reaction with radical species produced via irradiation of either a Norrish Type I (a-cleavage) or Norrish Type II photoinitiator.[20,21,22]
Summary
Blue-light activated rapid polymerization for defect-free bulk Cu(I)-catalyzed azide–alkyne cycloaddition (CuAAC) crosslinked networks† A visible-light (470 nm wavelength) sensitive Type II photoinitiator system is developed for bulk Cu(I)-catalyzed azide–alkyne cycloaddition (CuAAC) reactions in crosslinked networks.
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