Details of the Heat Capacity of the Rotator Phase of Pure n-Paraffin Crystal. Mesurement by AC Calorimetry for Heptacosane(n-C27H56).

DOI

Bibliographic Information

Other Title
  • 高純度ｎ‐パラフィン結晶の回転相における熱容量の詳細　ヘプタコサン（ｎ‐Ｃ２７Ｈ５６）のＡＣカロリメトリーにより測定
  • Mesurement by AC Calorimetry for Heptacosane (<i>n</i>-C<sub>27</sub>H<sub>56</sub>)
  • ヘプタコサン(<i>n</i>-C<sub>27</sub>H<sub>56</sub>)のACカロリメトリーによる測定

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Description

Temperature dependence and time dependences of the heat capacity of n-paraffin crystal (C27H56) in the rotator phase were studied by AC calorimetry. High purity material (99.9%) was used as the sample to avoid the large impurity effects to the phase transition behavior. Measurement during temperature scanning at 0.5K/min showed existence of motion in the rotator phase with the relaxation time about 0.3sec. Time dependence of the heat capacity at constant temperature in the rotator phase showed that the heat capacity changed with time very slowly. After the relaxation for twelve hous in the ratotar phase the sample was cooled down to the low temperature phase then heated up to the liquid phase. Temperature dependence of the heat capacity on the cooling and the heating processes showed that the relaxed state reached at temperatures higher than 329.9K was distinct from that reached at temperatures lower than 329.5K. It was found that there were two stable phases in the temperature region of the rotator phase. A model to explain the experimental results was proposed.

Journal

  • Netsu Sokutei

    Netsu Sokutei 21 (2), 61-67, 1994

    The Japan Society of Calorimetry and Thermal Analysis

Details 詳細情報について

  • CRID
    1390282680062412416
  • NII Article ID
    130003658577
  • DOI
    10.11311/jscta1974.21.61
  • ISSN
    18841899
    03862615
  • Text Lang
    ja
  • Data Source
    • JaLC
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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