Abstract A double-phthalate-ester imprinted photoresponsive polymer was fabricated for simultaneous detection of phthalate esters. Specifically, three azobenzene derivatives with different steric characteristics (0, 2, and 4 methyl substituents at the ortho position) were used as functional monomers, supported by ZnO nanoscale support rods. Dibutyl phthalate and dicyclohexyl phthalate esters were used as double templates. The three photoresponsive molecularly imprinted polymers were fabricated with a triethanolamine trimethacrylate ester cross-linker, and were characterized by ultraviolet–visible absorption, Fourier-transform infrared spectroscopy, scanning and transmission electron microscopy, and N2 adsorption–desorption analysis. Steric hindrance affected both photoresponsive properties and binding properties. As the steric hindrance increased, the trans→cis rate constant and the binding capacities decreased. Hence, the polymer with the least steric hindrance was used for the simultaneous detection of phthalate esters in plastic cups and toys. The doubly imprinted polymer was more effective for detection or extraction of the phthalate esters than was a single-phthalate-ester imprinted polymer.

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双印迹光响应聚合物同时检测塑料中的邻苯二甲酸酯

摘要 制备了一种双邻苯二甲酸酯印迹光响应聚合物，用于邻苯二甲酸酯的同时检测。具体而言，三种具有不同空间特性的偶氮苯衍生物（邻位有 0、2 和 4 个甲基取代基）被用作功能单体，由 ZnO 纳米级支撑棒支撑。邻苯二甲酸二丁酯和邻苯二甲酸二环己酯用作双模板。三种光响应分子印迹聚合物由三乙醇胺三甲基丙烯酸酯交联剂制成，并通过紫外-可见吸收、傅里叶变换红外光谱、扫描和透射电子显微镜以及 N2 吸附-解吸分析进行表征。空间位阻影响光响应特性和结合特性。随着空间位阻的增加，反式→顺式速率常数和结合能力降低。因此，空间位阻最小的聚合物被用于同时检测塑料杯和玩具中的邻苯二甲酸酯。双印迹聚合物比单邻苯二甲酸酯印迹聚合物更有效地检测或提取邻苯二甲酸酯。