对多壁碳管（MWCNTs）进行改性处理得到酸化碳管（MWCNTs-COOH）和环氧化碳管（MWCNTs-Epon828）, 将石墨烯（Graphene）与不同的碳管分别混合, 制备出三种Graphene-MWCNTs/环氧树脂（EP）复合材料。通过拉伸和热重实验研究了石墨烯与MWCNTs的协同作用、 两者的含量以及MWCNTs功能化方法对复合材料力学和热学性能的影响。结果表明： 石墨烯与MWCNTs的协同增强明显优于MWCNTs单独增强。当石墨烯和MWCNTs质量分数仅为0.1%时, Graphene-MWCNTs-Epon828/EP的拉伸强度达最大值, 其拉伸强度、 弹性模量和断裂伸长率分别较纯EP增加了35%、 65%和34%。石墨烯和MWCNTs的加入使Graphene-MWCNTs/EP复合材料的热稳定性均有所提高。
The multi-walled carbon nanotubes (MWCNTs) were functionalized to produce oxidized MWCNTs (MWCNTs-COOH) and epoxidized MWCNTs (MWCNTs-Epon828). Three types of Graphene-MWCNTs/EP composites were prepared by adding the graphene sheets and different types of MWCNTs into the epoxy resin (EP), respectively. By means of tensile test and thermal gravimetric analysis, the synergetic effects of graphene and MWCNTs, the effects of their content and the methods of MWCNT functionalization on the mechanical and thermal properties of the composites were studied. The results indicate that the synergetic reinforcement of the graphene and MWCNTs has a better performance than that of sole MWCNTs. Even with 0.1% mass fraction of the graphene and MWCNTs, the tensile strength of Graphene-MWCNTs-Epon828/EP composite approaches the ultimate value: The tensile strength, elastic modulus, and the elongation at break have been increased by 35%, 65% and 34%, compared with the pure EP, respectively. The thermal stability of all the Graphene-MWCNTs/EP composites are improved with the addition of graphene and MWCNTs.
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