以氧化石墨烯为前驱体,通过溶胶-凝胶法制备了石墨烯气凝胶(GA),然后通过超声混合的方式将GA与环氧树脂(EP)复合,制备了GA/EP复合材料.利用扫描电镜、N2吸附测试、X射线光电子能谱和X射线衍射对GA的结构进行了表征,并研究了添加不同质量分数的GA对GA/EP复合材料的热性能和导电性能的影响.结果表明,GA具有丰富的孔结构,其骨架是由石墨烯无规则堆积在一起形成的三维网格结构.经过高温热还原处理后,GA的比表面积增加到731.84 m2·g-1,组成其骨架的石墨烯的层间距缩小至0.347 nm,且绝大部分的含氧基团已经被除去.DMA和电导率测试结果表明,随着GA质量分数的增加,GA/EP复合材料的玻璃化转变温度呈现先升高后降低的变化趋势,而其电导率则呈现逐渐增加的趋势,逾渗阈值在0.05％～0.3％之间.
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