Abstract
Thermal conductivity of high-density polyethylene was measured by the steady-flow method at temperatures from 4.2 to 20°K. Results were analysed assuming two scattering processes of phonons: grain boundary scattering with a mean free path ΛG which is independent of phonon wave number k and intragrain scattering with a mean free path ΛD=A/ak2. It was found that ΛG=0.48 μ and A/a=0.51×1010 cm−1 for the as-received sample, and both increase with annealing. The radius of spherulite which was kept constant with annealing ranged 5 to 10 μ. ΛG is attributed to the extension of lamellar crystallite in the ab-plane. ΛD is assigned to intralamellar sub-boundaries. According to results in literature, the ratio of thermal conductivity K to specific heat C is almost constant from 1 to 3°K, where the grain boundary scattering is predominant. Since at 1°K the contribution of two-dimensional lattice waves (Lamb waves in lamellae) is more appreciable than three-dimensional ones, the above result implies that ΛG is the same for the two types of waves, which is consistent with our conclusion for ΛG.
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Kawamura, Y. Effect of Annealing on Low-Temperature Thermal Conductivity of High-Density Polyethylene. Polym J 1, 480–484 (1970). https://doi.org/10.1295/polymj.1.480
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DOI: https://doi.org/10.1295/polymj.1.480