聚苯胺@多孔羰基铁粉/多壁碳纳米管复合材料吸波性能研究

Microwave Absorption Properties of Polyaniline Coated Porous Carbonyl Iron Powder/Multi-walled Carbon Nanotube Composites

制备了导电高分子聚苯胺包覆多孔羰基铁粉(PANI@多孔CIP)/多壁碳纳米管(MWCNT)吸波复合材料,利用振动样品磁强计(VSM)、扫描电子显微镜(SEM)、X射线衍射仪(XRD)和网络分析仪,分别研究了不同填料质量分数的复合材料微观结构及吸波性能。结果表明,聚苯胺原位聚合可以很好地包覆在PCIP表面。在1~18GHz范围内,当多壁碳纳米管质量分数保持5%不变时,随着PANI@多孔CIP质量分数从20%增加到40%时,厚度为2.5mm的复合材料反射损耗峰由-7.8dB增加到-31.5dB;当PANI@多孔CIP质量分数为40%,厚度为2.5mm时,复合材料反射损耗在-10dB以下带宽约为3.1GHz。

A high-efficiency microwave absorbing material was prepared through a combination of doped polyaniline(PANI)-coated porous-structure carbonyl iron powder(CIP)and a small amount of multi-walled carbon nanotube(MWCNT)within bisphenol F epoxy resin.The microstructures and the morphology of the composites were investigated by X-ray diffraction(XRD)and scanning electron microscopy(SEM),and their microwave absorbing properties and magnetic properties were determined by a vector network analyzer and a vibrating sample magnetometer(VSM),respectively.The PANI@ porous CIP/MWCNT epoxy composites exhibit enhanced microwave absorption properties,which are attributed to the better impedance matching and enhanced microwave attenuation.When the mass fraction of PANI@ porous CIP increases from 20%to 40%,the maximum reflection loss increases from-7.8 dB to-31.5 dB,with a matching thickness of 2.5 mm.The experimental results show that the mass fraction of PANI@ porous CIP is 40% while the bandwidth with less than-10 dB RL reaches up to 3.1 GHz with a matching thickness of 2.5 mm.