中文摘要：

通过对多壁碳纳米管进行表面处理，用超声分散和模具浇注成型法制备了碳纳米管／环氧树脂纳米复合材料。研究了碳纳米管含量和表面处理对碳纳米管／环氧树脂复合材料力学性能和断面形貌的影响，分析了碳纳米管对环氧树脂的增强机理。结果表明，随着碳纳米管含量的增加，碳纳米管／环氧树脂复合材料的拉伸强度和弯曲强度及模量先增加后减小；当碳纳米管的质量分数为0．5％时，复合材料的拉伸强度、弯曲强度和弯曲模量分别达到最大值69．8MPa、136．9IPa和3．72GPa，比纯环氧树脂提高了33．9％、29．3％和4．8％；当碳纳米管的质量分数为1．5％时，拉伸模量达到最大值2050．5MPa，比纯环氧树脂提高了7．3％。

英文摘要：

Muhiwalled carbon nanotubes （MWNTs）/epoxy nanocomposites were fabricated by using uhrasonication and the cast molding method. MWNTs were modified by nitric acid and well dispersed in an epoxy matrix. The effects of MWNTs addition and surface modification on the mechanical properties and fracture morphologies of composites were investigated. The reinforcement mechanisms of the MWNT/epoxy composites are discussed according to the fracture morphologies of composites. The results indicated that the tensile and flexural strength and modulus of the MWNT/epoxy composites increased firstly and then decreased with the increasing of MWNTs addition, and when the content of MWCNTs loading reached 0.5wt% , the tensile strength, flexural strength and modulus reached the highest value of 69.8 MPa, 136.9 MPa and 3.72 GPa, respectively, which were increased by 33.9% , 29.3% and 4. 8%, respectively. When the content of MWCNTs loading reached 1.5%, the tensile modulus of the MWNT/epoxy composites reached the highest value of 2050.5 MPa, which was increased by 7.3%.