Abstract
To predict the isothermal course of a reaction from the dynamic DSC curves, the application of isothermal DSC curve transformation has been proposed. To perform such a transformation, it is sufficient only to determine the effective activation energy. To transform integral dynamic curves,α(T)), into isothermal ones,α(t), a better equation has been derived and its validity has been demonstrated on the example of two typical thermosetting systems. In addition, it has been shown that the transformation of differential curves, dα/dT (T), into isothermal ones dα/dt (α), readily allows determination of the kinetic function and rate constants. The procedure used to obtain information on the curing kinetics for thermosetting resins is characterized by simplicity and reliability and can work at E=E(α).
Zusammenfassung
Zur Prognose eines isothermen Reaktionsverlaufes anhand der DSC-Kurven wird die Anwendung einer Transformation der isothermen DSC-Kurven vorgeschlagen. Zur Durchführung einer solchen Transformation ist es ausreichend, die effektive Aktivierungsenergie zu bestimmen. Zur Transformation ganzer dynamischer Kurvenα(t) in isotherme Kurvenα(T) wurde eine bessere Gleichung erhalten und ihre Gültigkeit anhand von zwei charakteristischen Duroplast-Systemen demonstriert. Es wurde außerdem gezeigt, daß eine Transformation von Differentialkurven dα/dT (T) in isotherme Kurvendα/dt (α) leicht die Bestimmung der kinetischen Funktion und der Geschwindigkeit konstanten ermöglicht. Das Verfahren, was zur Ermittlung von Informationen über die Vernetzungskinetik von duroplastischen Harzen angewendet wurde, ist durch Einfachheit und Verläßlichkeit gekennzeichnet und gilt für E=E(α).
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The authors are grateful to T. S. Bebchuk and V. V. Matuhin for supplying excellent experimental data for EDA.
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Khabenko, A.V., Dolmatov, S.A. Isothermal transformation of dynamic DSC curves for thermosetting polymers in curing kinetics analysis. Journal of Thermal Analysis 36, 45–54 (1990). https://doi.org/10.1007/BF01912066
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DOI: https://doi.org/10.1007/BF01912066