THERMAL-CONDUCTIVITY AND SPECIFIC-HEAT OF PURE AND IODINE DOPED POLYACETYLENE (CH)X

A measurement of the thermal conductivity and the specific heat of pure and iodine doped samples of polyacetylene (CH)//x are presented. The thermal conductivity of pure (CH)//x is about 75 mW/cm. K at room temperature and decreases monotonically to 1. 6 mW/cm. K at 25 K. The specific heat dependence with temperature is roughly linear from about 0. 5 J/cm**3. K at 300 K down to 0. 04 J/cm**3. K at 25 K. Then the sample was doped in situ and two iodine concentrations were studied: 1. 5% and 4%. Within experimental error no change in the specific heat behavior was observed after this operation, but the thermal conductivity increased significantly. The change was similar 5 mW/cm. K for the 4% doped sample at room temperature and could be attributed to a charge carriers contribution. Assuming Wiedeman-Franz law to hold in this case, one finds that the intrinsic electrical conductivity is about 700 times higher than the measured value.