Journal
POLYMER
Volume 54, Issue 12, Pages 2857-2864Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2013.03.062
Keywords
Photoinitiator; Cationic photopolymerization; Radical photopolymerization
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Funding
- Institut Universitaire de France
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Novel functionalized ketones (K_PY) incorporating one/two pyrene moieties or a pyridinium chromophore for radical and/or cationic polymerization under soft irradiation conditions (Xe-Hg lamp, halogen lamp) are proposed. These compounds exhibit red-shifted absorptions and enhanced molar extinction coefficients (e.g. for near visible lights (395 nm), the absorption can be increased by a factor of 20). The ability of the various K_PY/amine couple in the radical polymerization of an acrylate (up to 75% conversion) and the different K_PY/diphenyliodonium salt system in the cationic polymerization of an epoxide (up to 70% conversion) is often better than that of reference compounds. These structures are also very efficient to overcome the oxygen inhibition. Molecular orbital calculations, ESR experiments and laser flash photolysis allow an investigation of the absorption properties, the excited state processes and the involved initiation mechanisms. (c) 2013 Elsevier Ltd. All rights reserved.
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