Panchromatic Type II Photoinitiator for Free Radical Polymerization Based on Thioxanthone Derivative
Panchromatic Type II Photoinitiator for Free Radical Polymerization Based on Thioxanthone Derivative
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DOI：
10.1021/ma302641d
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发表时间：
2013-04
期刊：
影响因子：
5.5
通讯作者：
H. Tar;D. S. Esen;Meral Aydın;C. Ley;N. Arsu;X. Allonas
中科院分区：
文献类型：
--
作者：
H. Tar;D. S. Esen;Meral Aydın;C. Ley;N. Arsu;X. Allonas
合成并表征了一种新型的噻吨酮类自由基光聚合引发剂。结果表明，该化合物在整个紫外-可见光谱范围内均有吸收，具有较高的吸收系数。荧光研究表明，三种不同的单重激发态是负责这种吸收。磷光和激光闪光光解的证据形成的三重态的光还原可以发生。因此，形成能够引发甲基丙烯酸甲酯在DMF中的光聚合的引发自由基。最后，丙烯酸酯的光聚合在膜中在不同的波长，如392，476，532，和632 nm，强调的可能性，使用这种新型的光引发剂时，全色照射是必需的。
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–vis 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.