Zuo Xiaoling, Morlet-Savary Fabrice, Graff Bernadette, Blanchard Nicolas, Goddard Jean-Philippe, Lalevée Jacques
Institut de Science des Materiaux de Mulhouse IS2M, UMR CNRS 7361, UHA, 15, Rue Jean Starcky, 68057, Mulhouse Cedex, France.
Laboratoire de Chimie Organique et Bioorganique, EA4566, UHA, ENSCMu, 3 rue Alfred Werner, 68093, Mulhouse Cedex, France.
Macromol Rapid Commun. 2016 May;37(10):840-4. doi: 10.1002/marc.201600103. Epub 2016 Apr 13.
The photochemical and electrochemical investigations of commercially available, safe, and cheap fluorescent brighteners, namely, triazinylstilbene (commercial name: fluorescent brightener 28) and 2,5-bis(5-tert-butyl-benzoxazol-2-yl)thiophene, as well as their original use as photoinitiators of polymerization upon light emitting diode (LED) irradiation are reported. Remarkably, their excellent near-UV-visible absorption properties combined with outstanding fluorescent properties allow them to act as high-performance photoinitiators when used in combination with diaryliodonium salt. These two-component photoinitiating systems can be employed for free radical polymerizations of acrylate. In addition, this brightener-initiated photopolymerization is able to overcome oxygen inhibition even upon irradiation with low LED light intensity. The underlying photochemical mechanisms are investigated by electron-spin resonance-spin trapping, fluorescence, cyclic voltammetry, and steady-state photolysis techniques.
报道了市售、安全且廉价的荧光增白剂，即三嗪基芪（商品名：荧光增白剂28）和2,5-双（5-叔丁基苯并恶唑-2-基）噻吩的光化学和电化学研究，以及它们在发光二极管（LED）照射下作为聚合反应光引发剂的原始用途。值得注意的是，它们优异的近紫外-可见光吸收性能与出色的荧光性能相结合，使得它们与二芳基碘鎓盐联合使用时能够作为高性能光引发剂。这两种组分的光引发体系可用于丙烯酸酯的自由基聚合。此外，这种增白剂引发的光聚合即使在低强度LED光照射下也能克服氧抑制。通过电子自旋共振-自旋捕获、荧光、循环伏安法和稳态光解技术研究了其潜在的光化学机理。
