Electrical conductance in polyethylene terephthalate films

The volume conductivity of polyethylene terephthalate films has been measured as a function of temperature in the range 65° to 150°C.; as a function of voltage in the range 1 to 1000 volts/mil; and as a function of film variables such as orientation and/or crystallization. Supplementary dielectric constant and loss measurements were also made. Previous work by Amborski(1) has defined the high temperature conductive properties of the oriented-crystallized (“Mylar”*) film and Reddish(2) has reported a comprehensive study of the dielectric constant and loss for the amorphous and crystalline polymer. However, the nature of the conduction mechanism could not be established from these data.