Abstract
Carbon nanotubes have special physical characteristics, such as light weight, electrical conductivity; highly thermal conductivity degree and thermal stability, etc. So there is a lot of potential application such as the aviation, aerospace, electromagnetic interference (EMI) material and electrostatic discharge (ESD),etc. In this paper, carbon nanotubes are treated with oxidizing in organic acids, and the surface modification of the nanotubes improve the quality of mechanical properties for nanocomposites. Carbon nanotubes dispersed into epoxy resin via sonication method and prepared nano-prepreg laminates with polymer matrix and carbon fiber. We investigate the properties of laminates consisting of adding different proportions of carbon nanotubes to the laminates for mechanical properties, electrical conductivity, electromagnetic interference shielding effectiveness and fatigue life, and observe the ability of resisting that materials suffer to the treated material under different temperature environments. The experimental result shows that mechanical strength, electrical conductivity and electromagnetic interference shielding effectiveness increases as the weight percentage of the carbon nanotube increases. In the experiment of thermal cycles treatment, because the coefficient of thermal expansion between the fibers and matrix is not the same, it cause the intensity to reduce with the cycles increased. In the same fatigue life, the absolute stress of carbon nanotube/laminate is higher than carbon fiber/epoxy laminate. Morphologies for the fracture surface of nano-prepreg laminate are observed by scanning electron microscope(SEM).