壬基酚表面印迹聚合物微球的合成及分子识别特性

Synthesis of Nonylphenol Surface Imprinted Polymer Microspheres and Their Molecule Recognition Characteristics

采用表面分子印迹技术,在二氧化硅微粒表面通过乙烯基三甲氧基硅烷接枝,以壬基酚(NP)为模板、α-甲基丙烯酸为功能单体制备了壬基酚印迹聚合物。扫描电镜及比表面分析仪测试结果表明制备的印迹聚合物呈均匀分散的微球,具有较大的比表面积。采用红外光谱表征印迹聚合物微球制备过程中的化学结构变化情况,并用平衡吸附法研究了聚合物对NP的结合性能与分子识别特性。研究结果表明,聚合物对壬基酚具有良好的结合亲和性,最大结合量可达184.6 mg/g。印迹聚合物对NP的吸附量高于其结构类似物对特辛基酚和双酚A的吸附量,表现出较高的选择性识别能力。

By using surface molecular imprinting technique,a molecularly imprinted polymer（MIPs） for nonylphenol（NP） was synthesized on the surface of silica microparticles（SiMPs） with NP as template molecule,2-methacrylic acid（MAA） as functional monomer and vinyltrimethoxysilane（VTTS） as grafting agent.The homogeneous dispersion of microspheres and larger specific surface area of the SMIP were observed by means of scanning electron microscopy（SEM） and BET adsorption apparatus.The characteritic of chemical structures in the modification procedure of MIP was studied by fourier transform infrared spectroscopy（FTIR）,and the adsorption property between the template molecule and functional polymer was evaluated by equilibrium adsorption method.The results indicated that the maximum adsorbing capacity of SMIP to NP was 184.6 mg/g.In addition,the adsorption capacity of SMIP to NP was higher than those of its structural analogues,e.g.p-octylphenol and bisphenol A,indicating that SMIP has a good recogntion capacity to NP.