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利用碳二亚胺活化碳纳米管上羧基的方法将1,6-己二胺接枝到单壁碳纳米管上。通过酸碱滴定确定了碳纳米管壁上羧基的含量,并对产物进行了红外和热重分析。将改性后的碳纳米管用于环氧复合材料,测试了材料的力学性能和电性能,并通过扫描电镜观察了断裂面的形貌。结果表明,羧基化碳纳米管上35%左右的羧基发生了酰胺化反应,碳纳米管上平均每100个碳原子接枝上2个己二胺分子链。经己二胺接枝改性后的碳纳米管在环氧树脂中的分散质量和界面粘合均得以明显改善。SWNT质量分数为1%时,复合材料的拉伸强度、弹性模量和断裂伸长率分别为（89.13±3.97）MPa,（2.03±0.18）GPa,（2.95±0.29）%,较纯环氧树脂分别提升了108%,28%和8%;电导率由纯环氧树脂的1.45×10-15 S/cm提高到7.36×10-4 S/cm。复合材料的性能有了很大的提高。“,”The 1,6-hexamethylene diamine was grafted to single-walled carbon nanotubes（SWNTs） by using carbodiimide to active the carboxyl groups on carbon nanotubes.The content of carboxyl on the carbon nanotube walls was determined by acid-base titration.The products were analyzed by infrared and thermogravimetric analysis.The modified carbon nanotubes were used for epoxy composites.The mechanical properties and electrical properties of the composites were tested and the fracture surface morphology of the composites were observed by scanning electron microscopy.The results showed that the carboxyl amidation reaction was occurred in about 35% of carboxylated carbon nanotubes and two hexamethylene diamine chains were grafted on every 100 carbon atoms of carbon nanotubes.The dispersion quality in epoxy resin and interfacial adhesion of the grafted carbon nanotubes were significantly improved.The tensile strength,Young＇s modulus and elongation at break of epoxy composites with 1% SWNT were（89.13±3.97）MPa,（2.03±0.18）GPa,（2.95±0.29）%,respectively and improved by 108%,28% and 8% compared with that of pure epoxy resins.The conductivity was increased to 7.36×10-4 S/cm from 1.45×10-15 S/cm of pure epoxy resin.The composite peoformence were improved greatly.