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Synergistic effects in hybrid free radical/cationic photopolymerizations
Authors:James V. Crivello
Affiliation:Department of Chemistry and Chemical Biology, Rensselaer Polytechnic Institute, Troy, New York 12180Department of Chemistry and Chemical Biology, Rensselaer Polytechnic Institute, Troy, New York 12180
Abstract:Multifunctional alkyl glycidyl ether and oxetane monomers are usually deemed to be poorly reactive and are consequently of limited use for high speed photocuring applications. However, these monomers can be made to undergo exceedingly rapid exothermic photopolymerization when combined with a multifunctional acrylate monomer and a corresponding free radical photoinitiator. Under optimum UV irradiation conditions, these hybrid photopolymerizations take place rapidly and substantially without an induction period. A mechanism was proposed on the basis of thermal acceleration of the cationic ring‐opening polymerizations induced by the fast exothermic free radical acrylate photopolymerization. © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 3759–3769, 2007
Keywords:acrylates  cationic photopolymerization  epoxides  free radical photopolymerization  interpenetrating networks  oxetanes  photopolymerization
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