Citation: Ming-Hui He, Rui-Xin Xu, Guang-Xue Chen, Zhao-Hua Zeng, Jian-Wen Yang. A thioxanthone-based photocaged superbase for highly effective free radical photopolymerization[J]. Chinese Chemical Letters, ;2014, 25(11): 1445-1448. doi: 10.1016/j.cclet.2014.05.031 shu

A thioxanthone-based photocaged superbase for highly effective free radical photopolymerization

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a State Key Laboratory of Pulp & Paper Engineering, South China University of Technology, Guangzhou 510640, China;
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b Institute of Polymer Science, DSAPM Lab, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, China;
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c School of Media and Communication, Shenzhen Polytechnic, Shenzhen 518055, China

Corresponding author: Jian-Wen Yang,
Received Date: 11 February 2014
Available Online: 14 May 2014
Fund Project: This research was financially supported by National Natural Science Foundation of China (No. 20974127, 21374135) (No. 20974127, 21374135) China Postdoctoral Science Foundation (No. 2013M542178) (No. 2013M542178) and the Fundamental Research Funds for the Central Universities (No. 2013ZB0025). (No. C713043z)

Thioxanthone-based N-phthalimidoamino acid ammonium salt (thioxanthen-DBU) as a photocaged base was synthesized and characterized. The photochemical properties and initiation mechanism were analyzed. It was found that the compound absorbs over the UV and visible region with relatively high absorption coefficients. Furthermore, the covalent binding of N-phthalimidoamino acid and type Ⅱ chromophores (thioxanthone, TX) remarkably improved the photoreactivity. Specifically, in combination with a benzoyl peroxide initiator, thioxanthen-DBU was able to initiate the amine-mediated redox photopolymerization of trimethylol propane triacrylate (TMPTA), and an excellent photopolymerization profile was obtained.
- Photocaged superbase,
- Redox initiation,
- Photopolymerization
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