Abstract
These year, the effect of EM(Electromagnetic) wave in our daily life is more and more important. Besides the effects on the electrical products . It is also important to the effects on our human body. We want to stop the EM wave to pass through our bodies and reduce the effect of the electrical products. Therefore, there are many researches studied in this direction. For many kinds of shielding of EM wave[1][2],the mixing of metal fibers with the polymer is a good method to form the shape we need. By these researches, we know the fiber in the matrix can connect together to form a conductive network, and as the aspect ratio is higher, the conductivity of composite increases so as to the shielding of EM wave. According to the electrical property of carbon nanotubes, we know it has some degree of conductivity by its special structure[3][4], and it has high aspect ratio for its length and width [5].therefore, we can take it as a kind of replacement of metal fiber to fill in polymer as filler to enhance the conductivity for the EMI effect. By the literatures reported [6][7], we can know the change of conductivity in the composite. And other literatures[8][9] which reported the shielding effect on the mixing of polymer and carbon nanotubes agree to the previous research[10] for that increase of the quantity of metal fiber,increase the conductivity of composites so as to the shielding of EM wave. this experiment is stressed on the pure multiwalled carbon tube and addition of some metal to change its shielding effects by adding methylbenzene to polymer and hoping to have a good distribution of MWCNT in the epoxy matrix.