The Low-Temperature Thermal Conductivity of Rubber

  • J. J. Freeman
  • D. Greig
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 30)

Abstract

There have recently been a number of studies of the temperature dependence of the thermal conductivity, κ, of semicrystalline polymers including the influence of (a) the degree of crystallinity1,2 and (b) the crystallite orientation3,4. The general result of these measurements which we reviewed in an earlier ICM conferences is that above and below ~20K the variation of κ with the two parameters is completely different. At the higher end of the range conductivity increases both with increasing crystallinity and the degree of orientation. At low temperatures, on the other hand, the specimens with the highest crystallinity have the lowest conductivity with values at ~2K roughly an order of magnitude lower than those found “universally” in all amorphous polymers6. This behaviour has also been observed in araldite containing powdered crystalline additives. For the semicrystalline polymers the low-temperature data are also found to be essentially independent of the degree of crystallite orientation.

Keywords

Crystallization Polyethylene Rubber Nitrile Polystyrene 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    A. Assfalg, J.Phys.Chem.Solids, 36: 1389 (1975).CrossRefGoogle Scholar
  2. 2.
    C.L. Choy and D. Greig, J.Phys.C:Solid State Physics, 8: 3121 (1975).CrossRefGoogle Scholar
  3. 3.
    C.L. Choy, Polymer, 18: 984 (1977).CrossRefGoogle Scholar
  4. 4.
    D. Greig, “Developments in Oriented Polymers - I,” I.M. Ward, ed., Applied Science Publishers Ltd., London (1982).Google Scholar
  5. 5.
    D. Greig and N.D. Hardy, “Non-Metallic Materials and Composites at Low Temperatures”, G. Hartwig and D. Evans, eds., Plenum Press, New York (1982).Google Scholar
  6. 6.
    R.B. Stephens, Phys.Rev., B8: 2896 (1973).CrossRefGoogle Scholar
  7. 7.
    K.W. Garrett and H.M. Rosenberg, J.Phys.D:Applied Physics, 7: 1247 (1974).CrossRefGoogle Scholar
  8. 8.
    L.A. Turk and P.G. Klemens, Phys.Rev., B9: 4422 (1974).CrossRefGoogle Scholar
  9. 9.
    Amorphous Solids - Low Temperature Properties“, W.A. Phillips, ed., Springer-Verlag, Berlin (1981).Google Scholar
  10. 10.
    K.H. Hellwege, J. Hennig, and W. Knappe, Kolloid.Z.Z.Polym., 188: 121 (1963).CrossRefGoogle Scholar
  11. 11.
    H. Tautz, Exper.Tech.der Phys., 7: 1 (1959).Google Scholar
  12. 12.
    J.C. Maxwell, “Treatise on Electricity and Magnetism”, Clarendon Press, Oxford (1904).Google Scholar
  13. 13.
    C.L. Choy and K. Young, Polymer, 18: 769 (1977).CrossRefGoogle Scholar
  14. 14.
    W. Reese, Jrn. of Applied Physics, 37: 864 (1966).CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1984

Authors and Affiliations

  • J. J. Freeman
    • 1
  • D. Greig
    • 1
  1. 1.Department of PhysicsUniversity of LeedsLeedsUK

Personalised recommendations