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General scheme for the proposed mechanism of the photocatalyzed CuAAC polymerization. A photoinitiator is first used to generate radicals, which reduce Cu(II) to Cu(I). The transiently generated Cu(I) then catalyzes the 1,3-dipolar cycloaddition. In the presence of the multifunctional azide and alkyne monomers, the photo-CuAAC reaction forms a cross-linked network, where “●” represents a triazole linkage.
