Abstract
AbstractSorption of iodine by bulk polyacetylene was studied under various I2 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/P0 = 0.25 (P is the pressure of the I2 gas and P0 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 I2 gas pressure under which sorption is carried out. At given iodine content, the conductivity of a sample doped under higher I2 pressure is greater than that of a sample doped under lower pressure.
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