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The thermal conductivity of three amorphous polymers has been measured between 0.4° and 4°K. The thermal conductivity of all samples has a similar temperature dependence, nearly temperature independent near 4°K and decreasing with an increasing power of the temperature as the temperature decreases. At the lowest temperatures the thermal conductivity is proportional to the three-halves power of the temperature. Above 1.2°K the data can be explained by resonant scattering; however, below 1.2°K, the data are not explained by existing theories. Between 2° and 4.2°K, the heat capacity is calculated from thermal diffusivity measurements. The data obey a T3 law but the magnitude is about 100% higher than that calculated from sound velocity measurements indicating an excess specific heat.
Choy et al. (1970) studied this question.