原子转移自由基聚合法制备表面分子印迹聚合物及性能研究

Preparation of molecularly imprinted polymers via atom transfer radical polymerization and its characteristics

采用原子转移自由基聚合法,以二苯并噻吩为模板分子,4-乙烯基吡啶为功能单体,在SiO2表面合成了适合分离油品中二苯并噻吩的新型表面分子印迹聚合物。利用傅里叶变换红外光谱、N2吸附实验、电子扫描电镜对印迹聚合物的结构和形貌进行了表征。通过在模拟油中的静态吸附实验,对印迹聚合物的吸附性能进行了研究。结果表明,在SiO2表面成功的合成了具有多孔结构的分子印迹层,分子印迹聚合物对二苯并噻吩表现出良好的特异性识别性能,吸附动力学满足准二级动力学方程,等温线符合Freundich等温线模型,吸附热力学研究表明吸附以熵驱动为主的自发的吸热过程。

Using dibenzothiophene （DBT）as template,4-vinyl pyridine （4-VP）as function monomer and TiO2 as carrier,a surface molecularly imprinted polymer （TiO2@MIP）was synthesized by atom transfer radical pol-ymerization （ATRP）.The sorbents were characterized by the Fourier transform infrared spectroscopy,nitro-gen adsorption and scanning electron microscopy.The adsorption properties of the sorbents were investigated in the model oil.The results indicated that a molecular imprinted layer with porous structure was successfully synthesized on the surface of silica,and TiO2@MIP not only had better surface characteristics but it also per-formed good specific recognition to DBT.The adsorption process followed the pseudo-second-order kinetic mod-el,and it was described well by Freundlich isotherm model.The adsorption thermodynamic parameters showed the adsorption was spontaneous endothermic.