We report two hyperbranched conjugated polymers (HCP) with truxene units as core and 1,4-didodecyl-2,5-diethynylbenzene as well as 1,4-bis(dodecyloxy)-2,5-diethynylbenzene as comonomers. Two analogous poly(para-phenyleneethynylene)s (PPE) are also prepared as comparison to demonstrate the difference between the truxene and the phenyl moieties in their optical properties and their sensing performance. The four polymers are tested for nitroaromatic analytes and display different fluorescence quenching responses. The quenching efficiencies are dependent upon the spectral overlap between the absorbance of the analyte and the emission of the fluorescent polymer. Optical fingerprints are obtained, based on the unique response patterns of the analytes toward the polymers. With this small sensor array, one can distinguish nine nitroaromatic analytes with 100% accuracy. The amphiphilic polymer F127 (a polyethylene glycol–polypropylene glycol block copolymer) carries the hydrophobic HCPs and self-assembles into micelles in water, forming highly fluorescent HCP micelles. The micelle-bound conjugated polymers detect nitroaromatic analytes effectively in water and show an increased sensitivity compared to the sensing of nitroaromatics in organic solvents. The nitroarenes are also discriminated in water using this four-element chemical tongue.

中文翻译：

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基于Truxene的超支化共轭聚合物：荧光胶束可检测水中的爆炸物

我们报告了两个高支化共轭聚合物（HCP），以丁烯单元为核心和1,4-二十二烷基-2,5-二乙炔基苯以及1,4-双（十二烷基氧基）-2,5-二乙炔基苯作为共聚单体。两个类似的poly（para还制备了（PPE）作为比较，以证明在戊烯和苯基部分之间的光学性质和传感性能上的差异。测试了这四种聚合物的硝基芳族分析物，并显示出不同的荧光猝灭响应。猝灭效率取决于分析物的吸光度和荧光聚合物的发射之间的光谱重叠。基于分析物对聚合物的独特响应模式，获得了光学指纹。使用这种小型传感器阵列，可以100％的准确度区分9种硝基芳族分析物。两亲性聚合物F127（一种聚乙二醇-聚丙二醇嵌段共聚物）带有疏水性HCP，并在水中自组装成胶束，形成高度荧光的HCP胶束。胶束结合的共轭聚合物可有效检测水中的硝基芳族化合物，并且与有机溶剂中的硝基芳族化合物相比，灵敏度更高。使用这种四元素化学舌头还可以在水中区分硝基芳烃。