Ionic polarization and electronic conduction in carbon-black-filled polyvinylchloride

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Abstract
Extended space-charge distributions, near contacts, have been detected by voltage distribution measurements on samples of carbon-black-filled PVC, under applied dc voltage. The resulting variable screening would be responsible for the large discrepancies from Ohm’s law observed in such materials. An ionic contribution to the space-charge distribution near the contacts is suggested by anomalous current variations under rapid changes of temperature; such current variations would be connected with the ion transit times and a method for determining the mobility of the ions is deduced. However, the ionic contribution to current transport is not predominant. This is shown by the current response to voltage pulses which suggests, rather, an electronic current in the body of the material and local ionization near the contacts.

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