Abstract
The time and temperature dependence of DC and electrical conductivity of vulcanized and fresh samples of crystalline CR have been investigated. The conduction has been found to occur by an ionic mechanism. The existence of ionic conduction is supported by the appearance of a peak in the current-time curves after the reversal of the polarity of the applied voltage. An anomalous behaviour was observed in the temperature dependence of the electrical conductivity and was attributed to the phase transition of CR from the crystalline to the amorphous state. It was also found that vulcanization increases the mobility of the current carriers and hence the electrical conductivity. On the contrary the milling process decreased both mobility and conductivity.
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