Synthesis of novel photoreactive bis(dithiocarbonate) type xanthates as chain transfer agents and their use in MADIX polymerization of styrene

A Xanthate-Type Photofunctional Chain Transfer Agent for the Synthesis of Macrophotoinitiators

“…Well-defined macrophotoinitiators are polymers with low molecular weight distributions, predetermined molecular weights, and photofunctional group(s) capable of initiating a photopolymerization reaction. , With the development of controlled/living polymerization methods, new ways have been opened to prepare well-defined polymers, and the limitations observed in conventional free radical polymerization such as poor control over molecular weight, molecular weight distribution, and macromolecular architecture have been eliminated. − Reversible addition–fragmentation chain transfer/macromolecular design via the interchange of xanthates (RAFT/MADIX) polymerization − is a robust controlled/living polymerization technique that allows the synthesis of a range of functional polymers, including macrophotoinitiators with predetermined molecular weight, narrow molecular weight distribution, and many controlled architectures, from homo-, branched, or stars polymers to block and graft copolymers. It has received great attention in recent years due to its easy applicability, versatility, and compatibility to a large family of functional monomers including not only more activated monomers (MAMs) but also less activated monomers (LAMs). ,, Especially, in the case of xanthate-type chain transfer agents (CTAs), well-defined poly­(LAMs) like PNVP − and PVAc ,, have successfully been produced via the RAFT/MADIX method.…”