聚苯胺复合中空微球的制备及其吸波性能研究

Preparation and Microwave Absorbing Properties of Polyaniline Composite Hollow Microspheres

以石墨烯和苯胺为主要原料,采用空心玻璃微球表面原位聚合法制备聚苯胺/还原石墨烯/二氧化硅(PANI/RGO/SiO_(2))复合中空微球。分别采用X射线衍射仪(XRD)、扫描电镜(SEM)、傅里叶变换红外光谱(FTIR)和网络矢量分析仪对PANI/RGO/SiO_(2)复合中空微球的结构、形貌、介电和吸波性能进行研究。结果表明:合成的聚苯胺完整包覆在SiO_(2)空心玻璃微球表面,石墨烯呈半透明薄纱状覆盖在聚苯胺表面;PANI/RGO/SiO_(2)复合中空微球的吸波性能比PANI/SiO_(2)好,石墨烯能改善复合材料对电磁波的吸收性能,且随石墨烯质量分数的增加,复合中空微球的吸波能力增强;当石墨烯的质量分数为5%、吸波层厚度为4 mm时,样品在6.32 GHz处达到最强反射损耗为-34.06 dB。

PANI/RGO/SiO_(2) composite hollow microspheres are prepared by in-situ poly-merization on the surface of hollow microspheres with graphene and aniline as main raw materials.The structure,morphology,dielectric and absorbing properties of PANI/RGO/SiO_(2) hollow microspheres are studied by X-ray diffraction(XRD),scanning electron micros-copy(SEM),Fourier transform infrared spectroscopy(FTIR)and network vector analyzer.The results show that the synthesized polyaniline is wrapped around the surface of silica,and graphene is covered on the surface of polyaniline in a semi-transparent yarn shape.The mi-crowave absorption performance of PANI/RGO/SiO_(2) hollow microsphere material is better than that of pure PANI/SiO_(2) material.Graphene improves the absorption performance of the composite to electromagnetic wave,and the absorption effect of the composite hollow micro-spheres is better with the increase of graphene content.When the mass fraction of graphene is 5%and the thickness of the absorbing layer is 4 mm,the sample reaches the strongest re-flection loss of-34.06 dB at 6.32 GHz.