Premium
Specific cationic photoinitiators for near UV and visible LEDs: Iodonium versus ferrocenium structures
Author(s) -
Mokbel Haifaa,
Toufaily Joumana,
Hamieh Tayssir,
Dumur Frederic,
Campolo Damien,
Gigmes Didier,
Pierre Fouassier Jean,
Ortyl Joanna,
Lalevée Jacques
Publication year - 2015
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.42759
Subject(s) - photopolymer , cationic polymerization , photochemistry , polymerization , flash photolysis , materials science , polymer chemistry , monomer , ring opening polymerization , radical polymerization , chromophore , photoinitiator , chemistry , polymer , kinetics , reaction rate constant , physics , quantum mechanics , composite material
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. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42759.