AbstractIn this paper, the electrical properties and the conductive mechanism of polymer‐filler particles are discussed using polymer‐grafted carbon black. Resistors with resistivities in the range of ca. 10–108Ω cm were made, and the resistance–temperature relationship was measured between 77 and 298° K. In this temperature range, the resistance decreased with an increase of temperature, suggesting that the electrical conduction is thermally activated. The resistance as a function of field strength was measured by a pulse method. The resistor was a resistivity of ca. 104Ω cm showed field dependence, and the change of resistance was reversible. It was found that the resistance was independent of temperature at high field strength, and tunneling conduction is predominant. On the basis of these facts, theoretical equations were derived and compared with the experimen
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