Polyacetylene (CH)z is a simple conjugated polymeric system, the electrical behaviour of which is considerably modified by doping processes: from an insulating behaviour it successively becomes semi‐conducting and even metallic. In this work first the dopant profiles through the sample is measured and the macroscopic diffusion coefficients of iodine and SbF5 is deduced. In the second part of this work a model is proposed which simultaneously take into account the diffusion and a chemical fixation of dopant molecules along the polyacetylene fibrils. Comparison between experimental and computed results shows that this model allows a better comprehension of the observed phenomena than the simple diffusion laws.
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