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Recent advances on push–pull organic dyes as visible light photoinitiators of polymerization

Abstract : Photoinitiators activable under visible light and low light intensity are actively researched as it can advantageously address the safety concerns raised by the traditional UV-light photopolymerization process as well as the light penetration issue. Among dyes strongly absorbing in the visible range, one of the most promising family of photoinitiators are push-pull dyes based on an electron-donating and an electron-accepting moiety connected at both ends of a polyenyl-type spacer. By acting on both the strength of the electron donor and the electron accep-tor, position of the intramolecular charge transfer (ICT) band can be easily tuned from the near-UV to the near infrared region. In this review, an overview of the different D-π-A push-pull dyes used as visible photoinitiators of polymerization is presented. Over the years, a clear evolution in the chemical structure of the electron accep-tors can be clearly observed, evidencing the strong activity existing around these structures.
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Corentin Pigot, Guillaume Noirbent, Damien Brunel, Frederic Dumur. Recent advances on push–pull organic dyes as visible light photoinitiators of polymerization. European Polymer Journal, Elsevier, 2020, 133, pp.109797. ⟨10.1016/j.eurpolymj.2020.109797⟩. ⟨hal-02872468⟩

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