采用熔融共混法制备了膨胀石墨(EG)/聚酯(PET)导电复合材料.利用扫描电镜及电导率测试等研究了复合材料的制备方法对其结构形态和导电性能的影响.结果表明,EG与聚合物基体间的相互作用和机械剪切力使PET分子能够进入EG的片层和孔隙中,促进了导电网络的形成,导致EG/PET复合材料具有较低的逾渗值,仅为3.14%.环氧树脂(ER)与EG间的强相互作用使其易于对EG插层和剥离,使ER-EG/PET体系的逾渗值进一步降低到1.80%.运用统计逾渗理论分析了材料的导电机制.发现复合材料电导率的各向异性、复杂的微观结构以及在高于逾渗值仍存在隧道导电是临界指数高于普适值的主要原因.
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