镍铁氧体/聚苯胺复合材料的制备及其性能

Preparation and properties of nickel ferrite-polyaniline composites

采用超声场下原位聚合法制备镍铁氧体/聚苯胺复合材料,并采用X射线衍射仪（XRD）和HP8510网络分析仪研究其结构和电磁性能。结果表明：十二烷基苯磺酸（DBSA）掺杂后的聚苯胺是部分结晶的,镍铁氧体与聚苯胺分子链之间存在某些相互作用;与聚苯胺相比,镍铁氧体/聚苯胺复合材料的介电损耗角正切值tanδε与磁损耗角正切值tanδm都增大;镍铁氧体含量为5%和15%（质量分数）的复合材料分别具有最大的tanδε值和最大的tanδm值;镍铁氧体含量为15%的试样在8~18 GHz范围内综合吸波性能最好,具有最大衰减-23.4 dB,-8 dB带宽为5.73 GHz。

The nickel ferrite/ polyaniline composites were prepared by in-situ polymerization method under the ultrasonic field.The structural characteristics and electromagnetic properties of the composites were analyzed by X-ray diffractometry（XRD） and HP8510 network analyzer,respectively.The results indicate that DBSA doped polyaniline has some degree of crystallinity.There is some interaction between the nickel ferrite particles and the polyaniline chains.The dielectric loss tangent tanδε and magnetic tanδm loss tangent of the nickel ferrite/polyaniline composites are higher than those of polyaniline.The composites with ferrite content of 5% and 15%（mass fraction） have the maximum tanδε and tanδm values,respectively.The composite with ferrite content of 15% shows better electromagnetic wave absorbing property with minimum reflection loss of-23.4 dB,and the bandwidth of-8 dB is 5.73 GHz.