Specific cationic photoinitiators for near UV and visible LEDs: Iodonium versus ferrocenium structures / Haifaa Mokbel, Joumana Toufaily, Tayssir Hamieh, Frederic Dumur, Damien Campolo, Didier Gigmes, ... więcej

Specific cationic photoinitiators for near UV and visible LEDs: Iodonium versus ferrocenium structures / Haifaa Mokbel, Joumana Toufaily, Tayssir Hamieh, Frederic Dumur, Damien Campolo, Didier Gigmes, Jean Pierre Fouassier, Joanna Ortyl, Jacques Lalevée // Journal of Applied Polymer Science [Dokument elektroniczny]. – 2015, Vol. 132, Iss. 46, 10 s. : tab., wykr. – Tryb dostępu: http://onlinelibrary.wiley.com/doi/10.1002/app.42759/epdf. – Oznaczenie ref./art.: 42759. – Bibliogr. 88 poz., Abstr. – doi: 10.1002/app.42759. – ISSN 0021-8995

Two iodonium salts based on a coumarin chromophore are investigated for polymerization upon light emitting diode irradiations (LEDs). They work as one‐component photoinitiators. They initiate the cationic ... więcej

Two iodonium salts based on a coumarin chromophore are investigated for polymerization upon light emitting diode irradiations (LEDs). They work as one‐component photoinitiators. They initiate the cationic polymerization of epoxides (under air) and vinylethers (laminate) upon exposure to violet LEDs (385 and 405 nm). Excellent polymerization profiles are recorded. Their efficiency is quite similar to that of a ferrocenium salt. Interpenetrating polymer networks can also be obtained through a concomitant cationic/radical photopolymerization of an epoxy/acrylate blend monomer. The light absorption properties of these new salts as well as the involved photochemical mechanisms are investigated for the first time through electron spin resonance, laser flash photolysis, steady state photolysis experiments. Molecular orbital calculations are also used to shed some light on the initiation mechanisms.