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Developing thioxanthone based visible photoinitiators for radical polymerization

机译:开发基于噻吨酮的可见光引发剂进行自由基聚合

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摘要

Three new amino-thioxanthone photoinitiators (PIs) with different substituents on nitrogen, including 2-allyl(methyl)amino-9H-thioxanthen-9-one (PI-1), 2-benzyl(methyl)amino-9H-thioxanthen-9-one (PI-2) and 2-butyl(methyl)amino-9H-thioxanthen-9-one (PI-3) were synthesized and characterized. They showed high molar extinction coefficients and very broad absorption range in the visible region. Among them, PI-2 showed the best visible light photoinitiating properties evidenced by the fact that it successfully initiated polymerization of 1,6-hexanedioldiacrylate (HDDA) under xenon light exposure (28 mW cm(-2)) both in the presence and absence of N,N-dimethylaniline (DMA) for 0.5 h with 92% and 52% conversion, respectively. For TMPTA, the conversion of PI-2 and PI-2/N-methyldiethanolamine (MDEA) systems is 32% and 62% under xenon lamp exposure for 10 min. The photoinitiation mechanisms were analysed through EPR, fluorescence spectra and visible light photolysis experiments.
机译:三种在氮上具有不同取代基的新型氨基噻吨酮光引发剂(PI),包括2-烯丙基(甲基)氨基-9H-噻吨酮-9-(PI-1),2-苄基(甲基)氨基-9H-噻吨酮-9合成并表征了一个(PI-2)和2-丁基(甲基)氨基-9H-噻吨酮-9-一个(PI-3)。它们在可见光区域显示出高的摩尔消光系数和非常宽的吸收范围。其中,PI-2表现出最佳的可见光光引发性能,这是通过在存在和不存在氙气(28 mW cm(-2))的情况下成功引发1,6-己二醇二丙烯酸酯(HDDA)聚合来证明的N,N-二甲基苯胺(DMA)萃取0.5小时,转化率分别为92%和52%。对于TMPTA,在氙灯暴露10分钟下,PI-2和PI-2 / N-甲基二乙醇胺(MDEA)系统的转化率分别为32%和62%。通过EPR,荧光光谱和可见光光解实验分析了光引发机理。

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