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首页> 外文期刊>Journal of Applied Polymer Science >Reactivity and efficiency of difunctional radical photoinitiators
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Reactivity and efficiency of difunctional radical photoinitiators

机译：双官能团自由基光引发剂的反应性和效率

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Three difunctional cleavable photoinitiators based on the alpha-hydroxyketone structure were tested in photopolymerization reactions with Fourier transform infrared spectroscopy. The excited-state processes were investigated with time-resolved laser absorption spectroscopy and laser-induced photocalorimetry, which allowed the cleavage quantum yields to be determined and estimates of the triplet-state lifetimes and interaction rate constants with a methacrylate monomer to be given. Modeling calculations helped to describe the ground-state properties and showed that the difunctional photoinitiators exhibited different chromophoric groups than the corresponding monofunctional photoinitiator. An examination of the photochemical reactivity versus, the practical efficiency observed in the polymerization showed that these difunctional photoinitiators exhibited better efficiency than the parent molecule, mainly because of their increased absorption properties. Their practical efficiency appeared to be better because of better light absorption when standard polychromatic light sources were used. (C) 2007 Wiley Periodicals, Inc.
机译：使用傅立叶变换红外光谱在光聚合反应中测试了三种基于α-羟基酮结构的双官能可裂解光引发剂。用时间分辨激光吸收光谱法和激光诱导的量热法研究了激发态过程，从而确定了裂解量子产率，并给出了三​​重态寿命和与甲基丙烯酸酯单体的相互作用速率常数的估计值。建模计算有助于描述基态性质，并表明双官能光引发剂与相应的单官能光引发剂表现出不同的发色基团。对光化学反应性与聚合反应中观察到的实际效率的对比研究表明，这些双官能光引发剂比母体分子表现出更好的效率，主要是因为它们的吸收性能增强。当使用标准多色光源时，由于更好的光吸收，它们的实际效率似乎更好。 （C）2007 Wiley期刊公司

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