In this paper, the effect of polarity on the volume
conductivity of Kapton and polyethylene (PE), determined using the corona
triode method, when the sample current depends linearly on grid potential, was
studied. For the determination of volume conductivity, in addition to the
analytical method, for the first time, a graphical method is presented as well.
According to the experimental results, obtained by both methods, the volume
conductivity values of negative corona charged samples were higher than those
of the samples charged by positive corona. Considering the different nature of
positive and negative coronas, these differences in results are to be expected
and are in full accordance with the theoretical considerations as well. On the
other hand, the good agreement between the analytical method results and those
obtained by the graphical method, indicates high accuracy of the proposed
analytical formula. Meanwhile, the satisfying accordance of experimental
results with those found by the classical “static” and “dynamic” methods,
confirms the accuracy of the corona method, for the determination of volume
conductivity of polymers.