A Multicolor Photoinitiator for Cationic Polymerization and Interpenetrated Polymer Network Synthesis: 2, 7‐Di‐tert‐butyldimethyldihydropyrene. Issue 13 (4th June 2013)

• Record Type: Journal Article
• Authors: Tehfe, Mohamad‐Ali; Dumur, Frédéric; Vilà, Neus; Graff, Bernadette; Mayer, Cédric R.; Fouassier, Jean Pierre; Gigmes, Didier; Lalevée, Jacques
• Is Part Of: Macromolecular rapid communications. Volume 34:Issue 13(2013:Jul.)
• Page Start: 1104
• Page End: 1109
• Publication Date: 2013-06-04
• Subjects: cationic photopolymerization -- free‐radical promoted cationic photopolymerization -- interpenetrated polymer networks (IPNs) -- photoinitiator -- visible light; Macromolecules -- Periodicals; Polymers -- Periodicals; Chemistry -- Periodicals; 547.705
• DOI: 10.1002/marc.201300302
• Languages: English
• ISSNs: 1022-1336

Abstract

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. Abstract : 2, 7‐Di‐ tert ‐butyldimethyldihydropyrene is proposed as the first panchromatic photoinitiator for cationic polymerizations and interpenetrated polymer network synthesis. Excellent polymerization profiles are reached and the chemical mechanisms are investigated