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A simple method for estimating activation energy from derivative thermoanalytical curves and its application to thermal shrinkage of polycarbonate

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Abstract

Activation energy can be estimated by a new simple method, in which logarithm of maximum rate of conversion observed at different heating rates is plotted against reciprocal absolute temperature, because the conversion at the maximum rate is approximately independent of the heating rate. The method is applied to thermal shrinkage of polycarbonate, and the estimated activation energy is in good agreement with those obtained by conventional methods.

Zusammenfassung

Die Schätzung der Aktivierungsenergie kann mittels einer neuen Methode erfolgen, bei welcher der Logarithmus der für verschiedene Aufheizgeschwindigkeiten gemessenen maximalen Konversionsgeschwindigkeit als Funktion der reziproken Temperatur aufgetragen wird, da die Konversion bei der maximalen Geschwindigkeit inetwa unabhängig von der Aufheizgeschwindigkeit ist. Das Verfahren wurde beim thermischen Schrumpfen von Polycarbonat angewendet und die geschätzte Aktivierungsenergie liegt in guter Übereinstimmung mit den in herkömmlichen Verfahren ermittelten Werten.

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Authors and Affiliations

  1. Tsukuba Research Center, Daicel Chemical Industries, Ltd., 305, Tsukuba, Japan

    T. Ozawa

  2. Department of Applied Chemistry, Faculty of Engineering, University of Utsunomiya, 321, Utsunomiya, Japan

    T. Koto

Authors
  1. T. Ozawa
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  2. T. Koto
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Dedicated to Professor Dr. H. J. Seifert on the occasion of his 60th birthday

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Ozawa, T., Koto, T. A simple method for estimating activation energy from derivative thermoanalytical curves and its application to thermal shrinkage of polycarbonate. Journal of Thermal Analysis 37, 1299–1307 (1991). https://doi.org/10.1007/BF01913863

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  • DOI: https://doi.org/10.1007/BF01913863

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