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Abstract Sorption of iodine by bulk polyacetylene was studied under various I 2 gas pressures at 25°C. The sorption dynamics show that the penetration of iodine into PA is not Fickian and the diffusion coefficient increases with time of sorption. A discontinuous increase in the sorption isotherm is observed at P/P 0 = 0.25 ( P is the pressure of the I 2 gas and P 0 is the saturation value at 25°C). It is due to iodine penetration into PA crystals, as evidenced by x‐ray analysis. The distribution of iodine within crystals is apparently inhomogeneous: some unit cells are changed into “iodine‐PA” cells, while others remain unchanged. The electrical conductivity depends not only on the amount of iodine but also on the I 2 gas pressure under which sorption is carried out. At given iodine content, the conductivity of a sample doped under higher I 2 pressure is greater than that of a sample doped under lower pressure.
Danno et al. (Mon,) studied this question.