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首页> 外文期刊>Polymer Testing >Mechanism of interaction of coumarin-based fluorescent molecular probes with polymerizing medium during free radical polymerization of a monomer
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Mechanism of interaction of coumarin-based fluorescent molecular probes with polymerizing medium during free radical polymerization of a monomer

机译：单体自由基聚合过程中香豆素类荧光分子探针与聚合介质相互作用的机理

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摘要

The effect of an electron-donating and an electron-withdrawing substituent at 4-position and selected electron-donating substituents at the 7-position of coumarin structure on its ability to monitor free radical photopolymerization of diethylene glycol dimethacrylate by the Fluorescence Probe Technique (FPT) has been evaluated. It was found that the fluorescence spectra position of the probes studied depends only on changes of the medium polarity and is not sensitive to changes of microviscosity. The changes of microviscosity of the medium upon monomer polymerization can be monitored only with probes that have fluorescence in liquid monomer partially quenched by the substituents, using relative fluorescence intensity measured at peak maximum. Mechanism of how the probes work has been discussed. Moreover, photostability of the probes studied under free radical photopolymerization conditions has been evaluated and the factors affecting the photostability have been suggested. 7-Amino-4-trifluoromethylcoumarin was found to be the most sensitive and photostable probe under the conditions studied. (C) 2016 Elsevier Ltd. All rights reserved.
机译：香豆素结构的4位给电子和吸电子取代基以及7位选择的给电子取代基对通过荧光探针技术（FPT）监测二甘醇二甲基丙烯酸酯自由基光聚合反应的能力的影响）已被评估。发现所研究的探针的荧光光谱位置仅取决于介质极性的变化，并且对微粘度的变化不敏感。单体聚合后介质的微粘度变化只能使用在峰值处测得的相对荧光强度，使用在单体中部分被取代基淬灭的液态单体中具有荧光的探针监测。已经讨论了探针如何工作的机制。此外，已经评估了在自由基光聚合条件下研究的探针的光稳定性，并提出了影响光稳定性的因素。在研究的条件下，发现7-氨基-4-三氟甲基香豆素是最敏感和最稳定的探针。 （C）2016 Elsevier Ltd.保留所有权利。

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