Panchromatic Type II Photoinitiator for Free Radical Polymerization Based on Thioxanthone Derivative

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• 作者：Haja Tar ; Duygu Sevinc Esen ; Meral Aydin ; Christian Ley ; Nergis Arsu ; Xavier Allonas
• 刊名：Macromolecules
• 出版年：2013
• 出版时间：May 14, 2013
• 年：2013
• 卷：46
• 期：9
• 页码：3266-3272
• 全文大小：357K
• 年卷期：v.46,no.9(May 14, 2013)
• ISSN：1520-5835

文摘

A new photoinitiator for free radical photopolymerization, belonging to the thioxanthone derivatives, was synthesized and characterized. It was found that the compound absorbs over the whole UV鈥搗is spectrum with relatively high absorption coefficients. Fluorescence studies reveal that three different singlet excited states are responsible for this absorption. Phosphorescence and laser flash photolysis evidence the formation of a triplet state from which a photoreduction can occur. Consequently, initiating radicals were formed which are able to initiate the photopolymerization of methyl methacrylate in DMF. Finally, the photopolymerization of acrylates was performed in film at different wavelengths such as 392, 476, 532, and 632 nm, emphasizing the possibility to use this novel photoinitiator when panchromatic irradiation is required.