The Glass Temperature and the Specific Heat of Apiezon N and T Greases

  • M. M. Kreitman
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 16)


The frequent use of Apiezon grease as a thermal bonding agent at cryogenic temperatures has led to interest in its physical properties [1]. Westrum, Chou, Osborne, and Flotow [2] have carried out heat-capacity measurements on a 32.54-g sample of Apiezon T grease. Their results reveal a broad anomaly in the temperature range 205 to 320°K. In a recent note on the specific heat of Apiezon N grease, Bunting, Ashworth, and Steeple [3] have also reported a broad anomalous region (see Fig. 1). Their results disclose a foothill extending from 200 to 260°K and a peak which has a maximum value at about 296°K. It is the purpose of this paper to comment on the specific-heat anomalies and to present evidence that the upturn in the specific heat of Apiezon N and T greases is associated with the glass transition [4] temperature T g.


Cryogenic Temperature Glass Temperature Slope Increase Anomalous Region Small Temperature Range 
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  1. 1.
    M. M. Kreitman and J. T. Callahan, Cryogenics, 10: 155 (1970).CrossRefGoogle Scholar
  2. 2.
    E. F. Westrum, C. Chou, D. W. Osborne, and H. E. Flotow, Cryogenics, 7: 43 (1967).CrossRefGoogle Scholar
  3. 3.
    J. G. Bunting, T. Ashworth, and H. Steeple, Cryogenics, 9:385 (1969).CrossRefGoogle Scholar
  4. 4.
    F. Bueche, Physical Properties of Polymers, Interscience, London (1962), Chap. 4.Google Scholar
  5. 5.
    R. F. Boyer, J. Appl. Phys., 25:825 (1954).CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1971

Authors and Affiliations

  • M. M. Kreitman
    • 1
  1. 1.University of DaytonDaytonUSA

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