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首页> 外文期刊>Journal of Applied Polymer Science >Photoluminescent Enhancement of Polyesters via Photocrosslinking
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Photoluminescent Enhancement of Polyesters via Photocrosslinking

机译：通过光交联增强聚酯的光致发光

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摘要

A homologous series of soluble photoluminescent polyesters, namely poly{bis(4-hydroxybenzylidene)acetone-5-(m-alkyloxyisophthalate)}, PAI1-PAI5 were designed and synthesized via polycondensation reaction. The branches of these polyesters consisted of flexible alkyloxy chains with different chain lengths in order to investigate their influence toward thermal stability as well as the photocrosslinking property. It was found that increasing length of the flexible chain would reduce the thermal stability of the polyesters. Irradiation of these polyesters under UV light induced photocrosslinking and showed fascinate enhancement in their photoluminescence property with greater emission intensity. This was evidenced visually from the transformation of a weak greenish blue emission to highly intense cloudy blue emission. The photocrosslinking system was further confirmed using spectroscopic methods. Morphology analysis using SEM showed that the photocrosslinked polyesters have a fiber-like or thread-like texture with more voids as compared to the virgin polyesters. This was because of the formation of cyclobutanes through photodimerization involving 2+2 cycloaddition. (c) 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41504.
机译：通过缩聚反应设计合成了一系列同源的可溶性光致发光聚酯，即聚{双（4-羟基亚苄基）丙酮-5-（间烷氧基间苯二酸酯）} PAI1-PAI5。这些聚酯的支链由具有不同链长的柔性烷氧基链组成，目的是研究它们对热稳定性以及光交联性能的影响。已经发现增加挠性链的长度会降低聚酯的热稳定性。在紫外线下照射这些聚酯会引起光致交联，并以更大的发射强度显示出令人着迷的光致发光性能增强。从弱的绿色蓝色发射到高强度的多云蓝色发射的转变从视觉上证明了这一点。使用光谱学方法进一步证实了光交联系统。使用SEM的形态分析表明，与原始聚酯相比，光交联聚酯具有纤维状或线状纹理，并且具有更多的空隙。这是因为涉及2 + 2环加成反应的光二聚反应形成了环丁烷。 （c）2014 Wiley Periodicals，Inc. J. Appl。 Polym。科学2015，132，41504。

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