Relative activity of possible initiating species produced from photolysis of tetraphenyl and triphenylbutyl borates as measured by fluorescence probe techniques
Relative activity of possible initiating species produced from photolysis of tetraphenyl and triphenylbutyl borates as measured by fluorescence probe techniques
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DOI：
10.1021/ma9810666
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发表时间：
1999-01-26
期刊：
影响因子：
5.5
通讯作者：
Neckers, DC
中科院分区：
文献类型：
--
作者：
Grinevich, O;Serguievski, P;Neckers, DC
利用荧光探针技术(FPT)获得了模型单体三乙二醇二丙烯酸酯(TEGDA)的聚合固化曲线。一些新的发色团、铵盐、三苯基丁基和四苯基硼酸盐被用作光引发剂，它们只是在铵盐部分的结构上不同。选择硫酸盐进行研究，以便比较它们的引发效率，可以揭示硫酸盐光分解产生的可能的引发物种的相对活性的信息。结果支持了我们先前的假设，即四苯基硼酸单分子分解后立即形成的α-氨基烷基自由基是最有效的引发物种，并且α-氨基烷基自由基也显著提高了三苯基丁基硼酸酯的光引发剂效率。还讨论了其他自由基对引发步骤的重要性。
Fluorescence probe techniques (FPT) have been used to obtain curing profiles for the polymerization of a model monomer, triethylene glycol diacrylate (TEGDA). A number of new chromophore ammonium salt triphenylbutyl and tetraphenylborates differing only in the structure of the ammonium salt moiety have been used as photoinitiators. The berates were chosen for study so that a comparison of their initiation efficiency would reveal information about the relative activity of possible initiating species produced upon berate photodecomposition. The results support our previous postulate that an alpha-aminoalkyl radical formed immediately after unimolecular decomposition from the tetraphenylborates is the most effective initiating species and that alpha-aminoalkyl radicals significantly increase the photoinitiator efficiency of triphenylbutylborates as well. The importance of other radicals to the initiation step is also discussed.