2000 Volume 120 Issue 12 Pages 1108-1113
Temperature dependence of resistivity ρ of carbon black(CB)-polyethylene composites below and above percolation threshold pc is studied based on the electrical conduction mechanism. The temperature dependence of ρ of the composites below pc can be explained with a tunneling conduction model by incorporating the effect of thermal expansion of the composite into a tunneling gap. By assuming that the electrical conduction through percolating paths is a thermally activated process and incorporating the effect of thermal expansion into volume fraction p of CB, the temperature dependence of ρ above pc has been well explained without violating the universal law of conductivity and the apparent activation energy is estimated to be 0.14 eV.
The transactions of the Institute of Electrical Engineers of Japan.A
The Journal of the Institute of Electrical Engineers of Japan