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利用固体合金化方法,制备了不同质量比的聚醚醚酮(PEEK)多/壁碳纳米管(MWNT)复合材料,通过场发射扫描电镜观察了微观形貌;对比研究了缓冷和速冷模压成型复合材料的交流电性能参数;并基于等效电路模型进行了拟合分析。结果表明:固体合金化方法能实现MWNT在PEEK基体中的短切与良好分散,有利于导电网络的形成;PEEK/MWNT复合材料的交流电性能参数随频率和MWNT含量的变化而有规律地变化;速冷模压成型有效降低了材料的电阻和体系的逾渗阈值;PEEK/MWNT复合材料的导电性能越好,其拟合结果越理想。
The multi-walled carbon nanotube (MWNT) composites with different mass ratios of PEEK were prepared by solid-state alloying method. The microstructure of the composites was observed by field emission scanning electron microscopy. AC molding performance of composite materials; and based on the equivalent circuit model fitting analysis. The results show that the solid alloying method can shorten and disperse the MWNT in the PEEK matrix, which is conducive to the formation of the conductive network. The AC electrical parameters of the PEEK / MWNT composites change regularly with the changes of the frequency and MWNT content. The rapid cold compression molding can effectively reduce the resistance of the material and the percolation threshold of the system. The better the conductivity of the PEEK / MWNT composite is, the better the fitting result is.