Abstract
Non-ohmic current—voltage characteristics of carbon black-loaded rubber vulcanizates are explained by tunnelling effects. In samples containing 40 pbw of HAF black in different dispersions, tunnelling parameters are found to depend on the degree of dispersion. In a second series the concentration of MT black varied between 10 and 50 pbw.The non-ohmic behavior of all these samples can be described by approximately the same equation, but tunnelling between impurities appears to predominate. A series of samples containing 50 pbw of six different blacks (MT, regal SRF, FEF, HAF, ISAF, SAF) appear to follow Ohm's law.
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