Combining photo-cleavable and hydrogen-abstracting groups in quinoxaline with thioether bond as hybrid photoinitiator
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- 作者：Ji-Yuan Yao ; Hong-Hao Hou ; Xiao-Dong Ma ; Hong-Jie Xu ; Zi-Xing Shi ; Jie Yin ; Xue-Song Jiang ; ponygle@sjtu.edu.cn
- 关键词：Photoinitiators ; Phenylquinoxaline ; Photo-cleavage ; Hydrogen-abstracting ; Photopolymerization
- 刊名：Chinese Chemical Letters
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：28
- 期：1
- 页码：6-12
- 全文大小：1213 K
- 卷排序：28
文摘
We synthesized four diphenylquinoxaline derivatives (SQs) with phenyl-thioether units, which combine photo-cleavable and hydrogen-abstracting groups in one molecule. The photochemistry and photopolymerization of SQs were investigated. SQs possess suitable UV−vis absorption in the range of 350−400 nm with high extinction coefficients. UV−vis and HPLC-MS spectra revealed that CS bond in phenyl-thioether group of SQs can be broken by irradiation of UV-light. Photolysis and photopolymerization experiments showed that SQs can be used as photo-cleavable photointiators, their photoinitiating efficiency can be enhanced by hydrogen donor. As photo-cleavable photoinitiators, SQs could initiate hexamethylene diacrylate (HDDA) very efficiently with the double bond conversion (DBC) of 80%. In the presence of ethyl-4-(dimethylamino) benzoate (EDB) as coinitiator, photoinitiator systems initiated photopolymerization of commercial acrylate monomers with higher double bond conversion than 90%. These characteristics make SQs potential photoinitiators in photo-curing field.