Journal
BEILSTEIN JOURNAL OF ORGANIC CHEMISTRY
Volume 9, Issue -, Pages 877-890Publisher
BEILSTEIN-INSTITUT
DOI: 10.3762/bjoc.9.101
Keywords
cationic photopolymerization; free-radical-promoted cationic photopolymerization; photocatalysts; photoinitiators; radical photopolymerization
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Funding
- Agence Nationale de la Recherche [ANR 2010-BLAN-0802]
- Institut Universitaire de France
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Eleven di- and trifunctional compounds based on a core-pyrene pi structure (Co_Py) were synthesized and investigated for the formation of free radicals. The application of two- and three-component photoinitiating systems (different Co_Pys with the addition of iodonium or sulfonium salts, alkyl halide or amine) was investigated in detail for cationic and radical photopolymerization reactions under near-UV-vis light. The proposed compounds can behave as new photocatalysts. Successful results in terms of rates of polymerization and final conversions were obtained. The strong MO coupling between the six different cores and the pyrene moiety was studied by DFT calculations. The different chemical intermediates are characterized by ESR and laser flash photolysis experiments. The mechanisms involved in the initiation step are discussed, and relationships between the core structure, the Co_Py absorption property, and the polymerization ability are tentatively proposed.
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