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以类雌性激素双酚A为模板分子,选取4-乙烯基吡啶作为功能单体,在极性溶剂甲醇中,通过非共价键完成自组装过程,沉淀聚合制备对双酚A分子具有高度选择性识别和亲和力的分子印迹聚合物.采用紫外-可见光谱研究了双酚A和4-乙烯基吡啶的配合方式以及配位比,结果表明双酚A与4-乙烯基吡啶以配位比1∶2的方式,在极性溶剂中,无法以常用的氢键形成超分子配合物,却可以π-π堆积这种非共价键完成自组装过程.通过红外谱图,验证了沉淀聚合法制备的印迹聚合物可以完成双酚A的印迹和可逆分离.通过扫描电镜和等温吸附实验考察了分子印迹聚合物对模板分子的特异性识别和选择性吸附机理,印迹聚合物的特异性吸附容量为37.39μmol/g,印迹指数为4.31;对其结构类似物四溴双酚A和苯酚的分离因子分别为2.51和2.06,同时对莠去津,萘普生和槲皮素的分离因子分别为2.14,2.26和2.63,证实了分子印迹聚合物在极性溶剂中可以对双酚A分子进行很好的特异性识别,并且识别环境更接近天然分子环境.
Using estrogen-like bisphenol A as a template molecule, 4-vinylpyridine was selected as a functional monomer to complete the self-assembly process by non-covalent bond in polar solvent methanol. The precipitation polymerization was highly selective for bisphenol A Identification and affinity of molecularly imprinted polymers.The UV-vis spectra of bisphenol A and 4-vinylpyridine with the coordination mode and the coordination ratio, the results show that bisphenol A and 4-vinyl pyridine with a coordination ratio of 1 : 2, in the polar solvent, can not form a supramolecular complex with common hydrogen bonds, but can be π-π stacking non-covalent bond to complete the self-assembly process.Through the infrared spectrum, the precipitation polymerization The prepared imprinted polymers can be used for the imprinting and reversible separation of bisphenol A. The specific recognition and selective adsorption mechanism of molecular imprinted polymers on template molecules were investigated by scanning electron microscopy and isothermal adsorption experiments.The specific adsorption capacity of imprinted polymers Was 37.39μmol / g and the imprinting index was 4.31. The separation factors of tetrabromobisphenol A and phenol were 2.51 and 2.06, respectively. The separation factors of atrazine, naproxen and quercetin were 2.14, 2.26 and 2.63, confirming that the molecularly imprinted polymer can recognize bisphenol A molecules well in polar solvents and recognize the environment closer to the natural molecular environment.