期刊
MACROMOLECULES
卷 44, 期 8, 页码 2531-2535出版社
AMER CHEMICAL SOC
DOI: 10.1021/ma200147f
关键词
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资金
- National Science Foundation [NSF-CHE-07-17518]
- Yildiz Technical University
- TUBITAK
- Istanbul Technical University
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [717518] Funding Source: National Science Foundation
The mechanism of formation of initiating radicals for free radical polymerization by the thioxanthone anthracene (TX-A) photoinitiator was investigated by laser flash photolysis, fluorescence and phosphorescence spectroscopy, and polymerization studies. The proposed mechanism of photoinitiation involves photoexcitation of TX-A and quenching of triplet excited states of TX-A by molecular oxygen to generate singlet oxygen. Singlet oxygen reacts with the anthracene moiety of TX-A to form an endoperoxide. The endoperoxide intermediate was isolated and characterized by MS and H-1 NMR The endoperoxide undergoes photochemical or thermal decomposition to generate radicals which are able to initiate free radical polymerization. A significant deuterium effect on the polymerization rates using CDCl3 and CHCl3 as solvents confirmed the involvement of singlet oxygen in the initiation process.
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