固相微萃取涂层材料多孔聚二乙烯基苯微球的合成∗

摘要

以偶氮二异丁腈(AIBN)为引发剂、二乙烯基苯(DVB-80)为单体、二氯甲烷-甲苯为二元致孔剂,采用沉淀聚合法制备单分散多孔聚二乙烯基苯微球(PDVB),用作固相微萃取涂层材料.扫描电镜表明,合成的聚合物微球球形规整、粒径均匀,数均粒径3．00μm,粒径多分散指数为1．03；氮气吸附测试表明,微球呈现多孔性, Langmuir比表面积为667 m2/g；热重分析表明,微球具有良好的热稳定性.采用此方法合成的多孔PDVB微球适合用作固相微萃取涂层材料.%Monodisperse porous poly (divinylbenzene)(PDVB)microspheres used as solid phase microextraction materials were prepared by precipitation polymerization in acetonitrile containing toluene and dichloromethane as coporogen with 2,2’-azobis(2-methylpropionitrile)(AIBN)as initiator in the absence of any stabilizer or sur-factant.Scanning electron microscope(SEM)image showed that the synthesized polymer microspheres had good spherical morphology,uniform particle size.Number average particle diameter was 3.00μm,and the particle size polydispersity index was 1.03.Isotherm nitrogen adsorption showed that PDVB microspheres had small pores and big specific surface area,and Langmuir specific surface area was 6 6 7 m2/g.Thermal gravimetric anal-ysis showed that PDVB microspheres had good thermal stability.The synthesized PDVB microspheres can be used as solid phase microextraction coating material.