Fe_3O_4-MWCNTs在环氧树脂中的定向排列  

Alignment of Fe_3O_4-MWCNTs in epoxy resin

作　　者：陈伟[1] 郑亚萍[1] 

机构地区：[1]西北工业大学理学院,西安710072

出　　处：《复合材料学报》2013年第6期54-59,共6页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(51073129);航空基金(2010ZF53060);西北工业大学研究生创业种子基金(z2012146);973项目(2010CB631104)

摘　　要：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。Nanoparticles Fe3O4 were synthesized with co-precipitation method and coated on the surface of multi-walled carbon nanotubes （MWCNTs） to prepare the magnetic Fe3O4-MWCNTs hybrid. The magnetic Fe3O4-MWCNTs hybrid was aligned in the epoxy resin under weak magnetic field （0.6 T）. Alignment and dispersion of Fe3O4-MWCNTs were studied by transmission electron microscope （TEM）. Dynamic mechanical analysis （DMA）, differential scanning calorimetry （DSC） and thermal conductivity were tested. As a result, nanoparticles Fe3O4 are coated on the surface of MWCNTs, hybrids are aligned end-to-up under 0.6 T magnetic field. Thermal conductivity is anisotropy, with lower thermal conductivity in vertical direction, while Fe3O4-MWCNTs hybrid has little effect on the parallel thermal conductivity. With adding Fe3O4-MWCNTs hybrid into epoxy resin, storage modulus decreases and loss modulus increases. In the meantime, loss factors of nano Fe3O4-MWCNTs/epoxy composites are higher than those of the pure epoxy resin exihibiting good damping property. When the mass ratio of Fe3O4-MWCNTs hybrid to epxy resin is 0.3%, loss factor is more than 0.7 and up to 1.16 at about 20 ℃.

关 键 词：磁性碳纳米管 FE3O4 纳米粒子 磁场定向 导热率 环氧树脂 

分 类 号：TB332[一般工业技术—材料科学与工程]