RETRACTED: A Study on the Percolation Threshold of Polyethylene Matrix Composites Filled Carbon Powder (Retracted article. See vol. 14, pg. 215, 2018)

초록

This paper investigates the percolation threshold of carbon powder-filled polyethylene matrix composites using the experimental results of the changes in resistivity and relative permittivity for filled carbon powder, the electric field dependence of current, and the critical exponent of conductivity. We found that a formation of infinite clusters is interrupted by a tunneling gap in the volume fraction section of filled carbon powder where the change in resistivity is extremely large. We also found that the critical exponent of conductivity for the universal law of conductivity is satisfied if the percolation threshold is estimated at the volume fraction of carbon powder where a nonohmic current behavior changes into an ohmic one. It is concluded that the percolation threshold should be defined at this volume fraction of carbon powder.

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