title: A multicolor photoinitiator for cationic polymerization and interpenetrated polymer network synthesis: 2,7-di-tert-butyldimethyldihydropyrene.
abstract: For polymer synthesis upon visible light, actual photoinitiator operates in a restricted part of the spectrum. As a consequence, several photoinitiators are necessary to harvest all of the emitted visible photons. Herein, 2,7-di-tert-butyldimethyldihydropyrene is used for the first time as a multicolor photoinitiator for the cationic polymerization of epoxides. Upon addition of diphenyliodonium hexafluorophosphate and optionally N-vinylcarbazole, the originality of this approach is to allow efficient monomer conversions under various excitation light sources in the 360-650 nm wavelength range: halogen lamps, and light-emitting and laser diodes. The synthesis of an interpenetrated polymer network from an epoxide/acrylate blend using a red light at 635 nm is also feasible. The formed polymer material exhibits a photochromic character.
authors.affiliation: Institut de Science des Matériaux de Mulhouse IS2M-UMR CNRS 7361-UHA, 15, rue Jean Starcky, F-68057 Mulhouse Cedex, France.
authors.forename: Mohamad-Ali
authors.initials: MA
authors.lastname: Tehfe
authors.forename: Frédéric
authors.initials: F
authors.lastname: Dumur
authors.forename: Neus
authors.initials: N
authors.lastname: Vilà
authors.forename: Bernadette
authors.initials: B
authors.lastname: Graff
authors.forename: Cédric R
authors.initials: CR
authors.lastname: Mayer
authors.forename: Jean Pierre
authors.initials: JP
authors.lastname: Fouassier
authors.forename: Didier
authors.initials: D
authors.lastname: Gigmes
authors.forename: Jacques
authors.initials: J
authors.lastname: Lalevée
mesh_terms: D001713:Biphenyl Compounds / Q000737:chemistry*; D002412:Cations; D004852:Epoxy Compounds / Q000737:chemistry*; D008027:Light; D009861:Onium Compounds / Q000737:chemistry*; D055668:Photochemical Processes; D017785:Photons; D058105:Polymerization; D011721:Pyrenes / Q000737:chemistry*; D014753:Vinyl Compounds / Q000737:chemistry
chemical_list: D001713:Biphenyl Compounds; D002412:Cations; D004852:Epoxy Compounds; D009861:Onium Compounds; D011721:Pyrenes; D014753:Vinyl Compounds; C031291:diphenyliodonium
keywords: cationic photopolymerization; free-radical promoted cationic photopolymerization; interpenetrated polymer networks (IPNs); photoinitiator; visible light