不同官能化碳纳米管对MWCNTs-碳纤维/环氧树脂复合材料力学性能的影响

Effect of different functionalized carbon nanotubes on mechanical properties of MWCNTs-carbon fiber/epoxy composites

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 effects of adding different functionalized carbon nanotubes on mechanical properties of epoxy,multi-walled carbon nanotubes with reactive amino groups(MWCNTs-EDA)were prepared by chemical processing on MWCNTs-COOH.MWCNTs-COOH and MWCNTs-EDA were dispersed in epoxy.T700 carbon fiber prepreg which epoxy containing carbon nanotubes was successfully produced by hot-melt method and then the quasi isotropic composite laminates were prepared.The results confirm that MWCNTs-EDA has better dispersion than MWCNTs-COOH.MWCNTs-EDA itself has curing reaction activity and exhibites a little effect on crosslinking density of matrix.Compared with MWCNTs-COOH,MWCNTs-EDA is more effective in enhancing the mechanical performance of epoxy and carbon fiber/epoxy composites.When the content of MWCNTs-EDA is 1.0wt%,the compression properties,flexural properties and compression strength after impact(CAI)of quasi isotropic MWCNTs-carbon fiber/epoxy composite laminates can be increased by 14.7%,40.9% and 20.6%,respectively.