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为研究加入不同官能化碳纳米管对环氧树脂力学性能的影响,通过对羧基化多壁碳纳米管(MWCNTsCOOH)进行化学处理,得到表面接枝乙二胺的碳纳米管(MWCNTs-EDA)。分别将MWCNTs-COOH和MWCNTs-EDA分散在环氧树脂中,通过热熔法制备环氧树脂中含有碳纳米管的T700碳纤维预浸料,并热压成准各向同性复合材料层合板。结果表明:MWCNTs-EDA在环氧树脂中的分散性优于MWCNTs-COOH,MWCNTsEDA本身具有固化反应活性,加入后对基体的交联密度影响较小。与MWCNTs-COOH相比,MWCNTs-EDA可以有效改善环氧树脂及碳纤维/环氧树脂复合材料的力学性能。当MWCNTs-EDA含量为1.0wt%时,MWCNTs-碳纤维/环氧树脂准各向同性复合材料层合板的压缩性能、弯曲性能和冲击后压缩强度分别提高了14.7%、40.9%和20.6%。
In order to study the effect of different functionalized carbon nanotubes on the mechanical properties of epoxy resin, carbon nanotubes (MWCNTs-EDA) grafted with ethylenediamine were obtained by chemical treatment of carboxylated multiwalled carbon nanotubes (MWCNTsCOOH) . MWCNTs-COOH and MWCNTs-EDA were dispersed in epoxy resin respectively. The T700 carbon fiber prepreg containing carbon nanotubes in epoxy resin was prepared by hot-melt method, and then hot-pressed into a quasi-isotropic composite laminate. The results show that MWCNTs-EDA disperses better than MWCNTs-COOH in epoxy resin. MWCNTsEDA itself has a curing reactivity, which has little effect on the crosslinking density of the matrix. Compared with MWCNTs-COOH, MWCNTs-EDA can effectively improve the mechanical properties of epoxy resin and carbon fiber / epoxy composites. When MWCNTs-EDA content is 1.0wt%, the compressive properties, flexural properties and post-impact compressive strength of MWCNTs-carbon fiber / epoxy quasi-isotropic composite laminates increase by 14.7%, 40.9% and 20.6% respectively.