Problems of non-linear theory in differential scanning calorimetry |
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Authors: | G N Gusenkov G A Krestov |
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Institution: | (1) Institute of Chemistry and Technology, 153460 Ivanovo, USSR |
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Abstract: | The problems of DSC non-linear theory, connected with the dependence of the thermophysical parameters upon the temperature, are discussed. The changes in thle form of the thermal energy curve recorded by the device as results of the thermaconductivity jump and heat capacity shift taken into account in the course of transformation are shown. A correct non-linear DSC model is formulated. The mather matical apparatus and some simplifying notions for calculation with the non-lineamodel are suggested. The interpretation of a calorimetric curve of an adiabatic scan. ning microcalorimeter over a pretransition range of temperatures is given as an example
Zusammenfassung Der Beitrag erörtert das Problem der nicht-linearen DSC-Theorie im Zusammenhang mit der Abhängigkeit der thermophysikalischen Parameter von der Temperatur. Die Änderungen der durch das Gerät registrierten Form der Wärme-Kraft-Kurve rühren, wie gezeigt wird, von einer jähen Änderung der Wärmeleitfähigkeit her und Änderungen der Wärmekapazität spielen im Laufe des Prozesses ebenfalls mit. Ein korrektes nicht-lineares DSC-Modell wird formuliert. Der mathematische Apparat und einige vereinfachende Begriffe zur Errechnung des nicht-linearen Modells werden vorgeschlagen. Als Beispiel wird die Interpretation einer kalorimetrischen Kurve eines adiabatischen Scanning-Mikrokalorimeters gegeben, das den Vor-Übergangs-Bereich von Temperaturen erfaßt.
Résumé L'article discute les problèmes concernant la théorie de l'analyse calorimétrique différentielle (DSC) non linéaire, en rapport avec le fait que les paramètres thermophysiques dépendent de la température. On montre que les variations de forme de la courbe enregistrée par l'instrument résultent d'un saut de conductibilité thermique et d'un changement de chaleur spécifique lors de la transformation. On donne un modèle correct de DSC non linéaire. On propose un traitement mathématique et quelques notions simplificatrices pour le calcul du modèle non linéaire. On donne comme exemple l'interprétation d'une courbe; calorimétrique fournie par un analyseur microcalorimétrique adiabatique, dans le domaine de température précédant la transition.
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