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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。
The superparamagnetic Fe3O4-MWCNTs (MWCNTs) composite particles were prepared by coprecipitation method, and were added into epoxy resin (EP) to be solidified under a weak magnetic field of 0.6T. TEM was used to study the degree of orientation and dispersion, and dynamic thermomechanical analysis, differential thermal analysis and thermal conductivity testing. The results show that the surface of MWCNTs coated with magnetic Fe3O4 nanoparticles, Fe3O4-MWCNTs complex in accordance with the end to end convergence along the direction of the magnetic field orientation. Fe3O4-MWCNTs / EP nanocomposites showed obvious anisotropy. The axial thermal conductivity of Fe3O4-MWCNTs perpendicular to Fe3O4-MWCNTs was lower than that in parallel direction. Fe3O4-MWCNTs had little effect on thermal conductivity in parallel direction. The addition of Fe3O4-MWCNTs made the storage modulus of epoxy resin smaller, the loss modulus larger, the loss factor greater than pure epoxy resin, showing good damping properties. When the mass ratio of Fe3O4-MWCNTs to EP is 0.3%, the loss factor is greater than 0.7 in the temperature range of 20 ℃ and the highest value is 1.16.