【摘要】 用分散聚合法制备单分散的聚苯乙烯(PS)微球,并用浓硫酸对PS微球进行表面改性。将改性后的PS微球作为制备聚苯胺(PANI)中空微球的模板,在一定浓度HCl掺杂条件下,苯胺单体在PS模板表面聚合,然后将PS模板通过N,N-二甲基甲酰胺(DMF)溶解,得到了粒径在0.8～1.2μm的PANI中空微球。若在PANI聚合过程中加入适量的Fe3O4,可获得由Fe3O4与PANI构成的复合中空微球。2～18GHz的波导法测试结果表明,经HCl和Fe3O4掺杂后的复合中空微球与本征态PANI中空微球的电磁参数存在很大变化;吸波性能研究表明,8～12GHz范围内,PANI中空微球的吸波效果要好于其实心微球的吸波效果。更多还原

【Abstract】 The monodispersed polystyrene (PS) microspheres templates are produced by dispersion polymerization and the surface modification of templates is carried out by simple sulphonation with concentrated sulfuric acid. Anilines are polymerized on the surface of sulphonated PS core through the condition of adulterating HCl with the appropriate concentration. After removing PS cores with N,N-Dimethyl formamide DMF, the uniform 0.8-1.2 μm PANI microspheres are obtained. If Fe3O4 nanoparticles are added into the system during the polymerizing process, PANI-Fe3O4 composites microspheres can also obtained. The electromagnetic parameters are tested by wave-guide experiments in the range of 2-18 GHz, results show that there is obvious change of magnetic conductivity between PANI-Fe3O4 composite microspheres and PANI microspheres, and PANI-Fe3O4 composites microspheres possess high value of dielectric constant tangent. Finally, the analysis of microwave absorbing performance tests demonstrate that hollow PANI microspheres have better microwave absorbing performance than solid PANI micropheres in the range of 8-12 GHz.更多还原