Recent advances on diaryliodonium-based monocomponent photoinitiating systems

Iodonium salts are historical cationic photoinitiators extensively used for the polymerization of epoxides or vinyl ethers. As drawback, the absorption of iodonium salts is strongly UV-centered so that this UV photoinitiator can only operate in the visible range by mean of a photosensitization process. With aim at simplifying the composition of the photopolymerizable resins, numerous chromophores have been covalently linked to the iodonium salts, enabling to design monocomponent photoinitiating systems. In this review, an overview of the different dyes that have been connected to iodonium salts is provided.