Reversible Thermochromic Polymer Film Embedded with Fluorescent Organogel Nanofibers
Reversible Thermochromic Polymer Film Embedded with Fluorescent Organogel Nanofibers
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DOI：
10.1021/la502932x
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发表时间：
2014-11-18
期刊：
影响因子：
3.9
通讯作者：
Chang, Ji Young
中科院分区：
文献类型：
--
作者：
Kim, Hyungwoo;Chang, Ji Young
我们报道了一种由荧光有机凝胶纤维和高度交联的聚合物基体组成的可逆热致变色纳米复合聚合物膜。在碱性条件下，通过二醛与苯乙腈或萘乙腈反应，合成了一系列氰基取代的低聚对苯撑亚乙烯基（CN-OPV）衍生物。在CN-OPV衍生物中，具有萘基部分和十二烷氧基链的NA-DBA在交联单体溶剂（二甲基丙烯酸乙二醇酯）中形成稳定的有机凝胶。有机凝胶表现出热不可逆的溶胶-凝胶转变，伴随着发射颜色的变化。在两块石英板之间通过有机凝胶的光聚合获得的纳米复合聚合物薄膜也表现出可逆的热致变色。在365 nm照射下，膜在25 ℃时的橙子在120 ℃时变为黄绿色.荧光光谱、DSC和显微镜结果表明，NA-DBA在聚合物基体中发生了热可逆自组装，产生了可逆热致变色。在120 ℃下熔化的胶凝剂分子没有扩散到聚合物基质中，可能是因为胶凝剂分子与聚合物基质的相互作用差。分散在聚甲基丙烯酸甲酯中的NA-DBA分子没有形成超分子结构，没有热致变色
We report a reversible thermochromic nanocomposite polymer film composed of fluorescent organogel fibers and a highly cross-linked polymer matrix. A series of cyano-substituted oligo(p-phenylenevinylene) (CN-OPV) derivatives Were synthesized by the reaction of dialdehydes with phenyl or naphthyl acetonitrile under basic conditions. Among the CN-OPV derivatives, NA-DBA having naphtyl moieties and dodecyloxy chains formed a stable organogel in a cross-linkable monomeric solvent (ethylene glycol dimethacrylate). The organogel showed a thenrnoreversible sol gel transition, accompanying the emission color change. A nanocornposite polymer fihn obtained by photopolymerization of the organogel between two quartz plates also exhibited reversible thermochrornism. Under 365 nm irradiation, the orange color of the film at 25 C became yellowish green at 120 C. The fluorescence spectroscopy, DSC, and microscopy results determined that the thermally reversible self assembly of NA-DBA occurred M the polymer matrix, resulting in reversible thermochromism. The melted gelator molecules at 120 C did not diffuse into the polymer matrix probably because of poor interactions of the gelator molecules with the polymer matrix. The NA-DBA molecules dispersed in poly(methyl methacrylate), without forming a supramolecular structure, did not show thennochromism