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A glance at violet LED sensitive photoinitiators based on the spiroxanthene scaffold

Abstract : A novel photoinitiator based on a spiroxanthene scaffold in the presence of an iodonium salt is proposed for the cationic ring-opening polymerization of a diepoxide, as well as for the free-radical polymerization of an acrylate upon violet LED exposure (385 and 405 nm). Good-to-excellent rates of polymerization and final conversions are obtained. These systems are characterized by a higher reactivity compared with that of anthracene/iodonium salt used as reference for cationic near UV polymerization. The addition of a poly(ionic liquid) improves the cationic polymerization profiles. The photochemical mechanisms are studied by steady-state photolysis, fluorescence, and electron spin resonance spin-trapping techniques. Molecular orbital calculations give an insight into the light absorption properties. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43213
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Submitted on : Wednesday, December 9, 2015 - 1:37:48 PM
Last modification on : Wednesday, January 13, 2021 - 3:11:57 AM

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Haifaa Mokbel, Cyril Poriel, Joëlle Rault-Berthelot, Frédéric Dumur, Didier Gigmes, et al.. A glance at violet LED sensitive photoinitiators based on the spiroxanthene scaffold. Journal of Applied Polymer Science, Wiley, 2016, 133 (12), ⟨10.1002/app.43213⟩. ⟨hal-01240653⟩



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