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The conductivity of the conducting polymer polypyrrole was measured as a function of time t a during aging at 120 °C, and as a function of temperature T between 15 K and 300 K for various aging times. It is shown that the dependence of the conductivity with time and temperature for long aging times merges into a unified expression: ln {σ( t a , T )} ∝ - ( t a / T ) 1/2 . Such a behaviour can be accounted for by a model in which the conductivity of aged polypyrrole is governed by a hopping mechanism between conducting clusters separated by an insulating layer, the thickness of which increases as √ t a .
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Sixou et al. (1995) studied this question.
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