对短碳纤维进行氧化处理后,采用原位氧化沉淀聚合法使苯胺/磁流体或者苯胺/磁粉在其表面进行包覆反应,制备出具备有一定长径比的导电导磁改性短碳纤维.采用扫描电镜、X射线能谱及X射线衍射对改性碳纤维的形貌、化学组成进行了分析,利用PNA-LN5230A微波网络测试仪测定了其在频率2GHz以下的复介电常数和复磁导率,对比分析了两种不同方法制备的改性碳纤维的电磁参数以及2mm厚度下的吸收损耗.结果表明:聚苯胺/磁流体包覆的碳纤维(改性SCF-A)包覆层完整、致密,Fe含量为2.86at%;聚苯胺/磁粉包覆碳纤维(改性SCF-B)的包覆层外观完整、比较松散,Fe含量为3.12at%.改性SCF-A的复介电常数的实部大于改性SCF-B,但其虚部则小于改性SCF-B;改性SCF-B的复磁导率整体大于改性SCF-A.在频率2GHz以下,改性SCF-A的最大吸收损耗为3.06dB,改性SCF-B的最大吸收损耗为4.14dB.
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