用共沉淀法制备了具有超顺磁性Fe3O4-MWCNTs(多壁碳纳米管)复合粒子,加入环氧树脂(EP)中,在0.6T的弱定磁场下固化成型.采用TEM研究其定向程度及分散性,并进行动态热机械分析、差热分析和导热率测试.结果表明,MWCNTs表面包覆了磁性Fe3O4纳米粒子,Fe3O4-MWCNTs复合物按照首尾衔接的方式沿着磁场方向定向排列.Fe3O4-MWCNTs/EP纳米复合材料表现出明显的各向异性,垂直于Fe3O4-MWCNTs轴向导热率低于平行方向的导热率,Fe3O4-MWCNTs的加入对于平行方向的导热率影响不大.Fe3O4-MWCNTs的加入使环氧树脂的储能模量变小,损耗模量变大,损耗因子均大于纯环氧树脂,表现出良好的阻尼性能.当Fe3O4-MWCNTs与EP质量比为0.3％时,损耗因子在20℃的温域内大于0.7,最高值达到1.16.
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