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Novel Dual‐Cure Initiating System for Cationic Polymerization of Epoxides
Author(s) -
Maréchal David,
Allonas Xavier,
Lecompère Maxime,
Criqui Adrien
Publication year - 2016
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201500523
Subject(s) - cationic polymerization , photopolymer , polymerization , nucleophile , epoxy , thermal decomposition , polymer chemistry , chemistry , photochemistry , reactivity (psychology) , ring opening polymerization , materials science , organic chemistry , polymer , catalysis , medicine , alternative medicine , pathology
Pyrylium salts are found to be effective initiators for both photochemical and thermal cationic polymerization of epoxy resin. The photopolymerization results show that triphenylpyrylium salt derivatives are the most efficient structures. These compounds also exhibit some thermal reactivity at room temperature in the absence of light. However in such case, the gel time of the resin is quite high. Therefore, to speed up the thermal reaction, nucleophilic compounds are added as coinitiators, these compounds being known to yield a fast decomposition of pyrylium salts. This indeed increases the polymerization of epoxy resin at room temperature, opening the way to the development of quite efficient dual‐cure photochemical/thermal initiating system for cationic polymerization.