Premium
A glance at violet LED sensitive photoinitiators based on the spiroxanthene scaffold
Author(s) -
Mokbel Haifaa,
Poriel Cyril,
RaultBerthelot Joëlle,
Dumur Frédéric,
Gigmes Didier,
Toufaily Joumana,
Hamieh Tayssir,
Cordella Daniela,
Detrembleur Christophe,
Fouassier Jean Pierre,
Lalevée Jacques
Publication year - 2016
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.43213
Subject(s) - cationic polymerization , photoinitiator , polymerization , photopolymer , photochemistry , polymer chemistry , radical polymerization , chemistry , ring opening polymerization , ionic polymerization , materials science , polymer , organic chemistry , monomer
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.