Electrical conductivity of polymer composites highly filled with carbon nanotube
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There are growing interests in polymer composites incorporating nanocarbon fillers such as graphene (electrical conductivity of 104–106 S/m) or carbon nanotube (CNT, 104–106 S/m) due to the demand for lightweight materials exhibiting high electrical conductivity. The electrical conductivity of the polymer composite incorporating the nanocarbon filler is based on the percolation behavior generated by the electron tunnel effect. Many studies on polymer composites incorporated with CNT have reported percolation behavior in the range of 1-3 wt% CNT content. However, the electrical conductivity of the composite has been rarely reported at a filler content of 20 wt% or more. In this study, the behavior of electrical conductivity based on material structure and theory was investigated after preparing a high-filled (＞20 wt%) polymer composite with uniform dispersion of CNTs via in situ polymerization of oligomer resin.