Visible light‐emitting diode‐sensitive thioxanthone derivatives used in versatile photoinitiating systems for photopolymerizations |
| |
Authors: | Xingyu Wu Ming Jin Jean‐Pierre Malval Decheng Wan Hongting Pu |
| |
Institution: | 1. School of Materials Science & Engineering, Tongji University, 4800 Caoan Road, Shanghai, People's Republic of China;2. Institut de Science des Matériaux de Mulhouse, UMR CNRS 7361, Université de Haute‐Alsace, 15 rue Jean Starcky, Mulhouse, France |
| |
Abstract: | Novel thioxanthone (TX) derivatives are used as versatile photoinitiators upon visible light‐emitting diode (LED; e.g., 405, 425, and 450 nm) exposure. The mechanisms for the photochemical generation of reactive species (i.e., cations and free radicals) produced from photoinitiating systems based on the photoinitiator and an iodonium salt, tris(trimethylsilyl)silane, or an amine, were studied by UV–vis spectroscopy, fluorescence, cyclic voltammetry, steady‐state photolysis, and electron spin resonance spin‐trapping techniques. The reactive species are particularly efficient for cationic, free radical, hybrid, and thiol‐ene photopolymerizations upon LED exposure. The optimized photoinitiating systems exhibit higher efficiency than those of reference systems (i.e., isopropyl TX‐based photoinitiating systems), especially in the visible range. According to their beneficial features, these photoinitiating systems have considerable potential in photocuring applications. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017 , 55, 4037–4045 |
| |
Keywords: | cationic polymerization photoinitiating systems photoinitiator photopolymerization radical polymerization thioxanthone derivatives versatile photoinitiator visible LED |
|
|