中文摘要：

采用不同氧化性的酸对多壁碳纳米管（MWNTs）进行处理，制备了环氧树脂（EP）／MWNTs导电复合材料。研究表明，少量的MWNTs就能使EP的导电性能有很大的提高；HNO3酸化处理不仅可在MWNTs表面引入活性基团并将MWNTs截短到合适的长度，改善其在树脂中的分散性，而且能有效去除非晶碳杂质，提高MWNTs的导电性，使EP／MWNTs复合材料的导电性能最好，渗流阈值只有0．5％左右；未处理的MWNTs在EP中的分散性较差，复合材料的渗流阈值为1．3％左右；而经混酸酸化处理的MWNTs中存在许多缺陷，且MWNTs的长度变得太短，复合材料的导电性能最差，渗流阂值为1．6％左右。

英文摘要：

Multi-walled carbon nanotubes（MWNTs）are treated by different oxidative acids, and epoxy（ EP）/MWNTs composites are prepared. It is showed that the conductivity of the epoxy can be greatly increased with a small quantity of MWNT addition. The composite prepared with the HNO3treatment has a best conductive property and exhibits a percolation threshold of 0. 5%. One reason for this can be attributed to that the HNO3 trcatment introduces the carboxyl and hydroxyl onto MWNTs as well as shorten the MWNTs to a suitable length, which greatly improve the dispersivity of MWNTs in epoxy, the other is the conductivity of MWNTs is enhanced by the acidification. In contrast, the composite prepared without acidification treatment shows poorer dispersivity and has a percolation threshold of 1.3%. For the composite with mixed acid （VHNO3：VH2SO4 = 1：3） treatment, the conductivity is poorest and presents a percolation threshold of 1.6%. This is due to the fact that quantities of defects are introduced into MWNTs by the mixed acid treatment and at the same time MWNTs are subjected to chain-scission to be too short, which is disadvantage to the formation of conductive network.