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Degree of crystallinity and lattice thermal conductivity of polyethylene at low temperatures

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Abstract

The lattice thermal conductivity of a semicrystalline polymer was studied at low temperatures by calculating the total lattice thermal conductivities of four samples of polyethylene with different degrees of crystallinity between 0.43 and 0.81 and temperatures between 0.4 and 20 K. The contributions of the crystalline and noncrystalline natures and their percentage contributions were taken into account. The predicted lattice thermal conductivity of polyethylene was in fairly good quantitative agreement with the experimental value, and showed a strong crystallinity dependence, with a distinctive cross-over point at about 2 K.

Zusammenfassung

Die Gitterwärmeleitfähigkeit eines semikristallinen Polymers wurde bei niedrigen Temperaturen über die Berechnung der gesamten Gitterwärmeleitfähigkeit von vier Proben aus Polyethylen mit verschiedenem Kristallinitätsgrad zwischen 0,43 und 0,81 und bei Temperaturen zwischen 0,4 und 20 K untersucht. Dabei wurde der Beitrag des kristallinen und nichtkristallinen Natur und ihr prozentueller Beitrag berücksichtigt. Die vorausgesagte Gitterwärmeleitfähigkeit von Polyethylen stand in guter quantitativer Übereinstimmung mit dem experimentellen Wert, und zeigt eine starke Kristallinitätsabhängigkeit mit einem auffälligen Cross-over bei etwa 2 K.

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Authors and Affiliations

  1. Department of Physics, College of Education, University of Basrah, Basrah, Iraq

    A. H. Awad & S. N. Shargi

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  1. A. H. Awad
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  2. S. N. Shargi
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Awad, A.H., Shargi, S.N. Degree of crystallinity and lattice thermal conductivity of polyethylene at low temperatures. Journal of Thermal Analysis 42, 1123–1135 (1994). https://doi.org/10.1007/BF02546922

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