微米级PS-PEDOT核壳型导电微球的合成与拉曼表征

Preparation and Raman Characterization of Micron-Sized Core-Shell PS-PEDOT Conductive Microspheres

以分散聚合法制备的微米级聚苯乙烯(PS)微球为模板、3,4-乙烯二氧噻吩(EDOT)为单体、过硫酸铵(APS)为引发剂,通过氧化聚合制备了PS-PEDOT核壳型复合导电微球。采用扫描电镜、透射电镜等对导电微球的形貌和结构进行了表征,重点采用拉曼光谱研究了其核壳结构特征。并研究了超声分散、溶液pH以及单体配比对导电微球形貌的影响。实验结果表明:超声的引入可提高导电微球的单分散性,改善微球的形貌。随着pH的降低或单体配比的增加,导电聚合物在PS微球表面的负载量随之增加,当m(EDOT)/m(PS)由0.60增加到1.25时,导电微球的平均粒径由1.76μm增加到1.91μm。

Using monodispersed micron-sized PS microspheres as template,EDOT as monomer and APS as initiator,the core-shell PS-PEDOT conductive microspheres were synthesized by chemical oxidation polymerization.The morphology and structure of PS-PEDOT were characterized by SEM and TEM.The characteristic of core-shell structure of PS-PEDOT microspheres was emphatically studied by Raman spectra.On the basis,some synthesis conditions such as ultrasonic irradiation,pH value of PS emulsion and monomer ratio were optimized.Results indicated that ultrasonic could improve the morphology of microspheres,and acid condition was propitious for deposition of EDOT on the surface of the PS template.With the decreasing of pH value or increasing of monomer ratio,the deposition of PEDOT on surface of PS microspheres increased.When m（EDOT）/m（PS）changed from 0.60 to 1.25,the average particle size of conductive microspheres changed from 1.76μm to 1.91μm.