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Glass transition kinetics measured by fast scanning calorimetry
Authors: Svoboda Roman
Year: 2015
Type of publication: článek v odborném periodiku
Name of source: Journal of Thermal Analysis and Calorimetry
Publisher name: Springer
Place: Heidelberg
Page from-to: 985-995
Titles:
Language Name Abstract Keywords
cze Kinetika skelného přechodu měřená pomocí ultrarychlé skenovací kalorimetrie Entalpická relaxace selenu byla měřena pomocí ultrarychlé skenovací kalorimetrie. Získaná data byla popsána na základě Tool-Narayanaswamy-Moynihan modelu. Rozdíl mezi takto získanými daty a daty obdrženými klasickou DSC metodou byl vysvětlen na základě teplotního gradientu ve vzorku. skelný přechod; entalpická relaxace; ultrarychlé DSC; teplotní gradient
eng Glass transition kinetics measured by fast scanning calorimetry Enthalpy relaxation data obtained for amorphous selenium by means of fast scanning calorimetry were described in terms of Tool-Narayanaswamy-Moynihan model. The effect of thermal gradients formed within the measured sample was found to explain the marked difference between the FSC and conventional DSC data obtained for a-Se. If the influence of thermal gradients is accounted for, the similar set of TNM parameters as obtained for a-Se from conventional DSC can be used to describe the FSC data. Temperature profiles of the thermal gradients as well as sources of additional uncertainties occurring within the introduced conception are discussed in detail. In addition, a normalization procedure accounting for the difference between the slopes of heat capacity in the glass and undercooled liquid regions was introduced. Correct data preparation was found to have a critical influence on the applied enthalpy relaxation evaluation procedures. Due to the unresolved issue of the prediction of manifesting thermal gradients found in case of the recent study on amorphous selenium, the FSC technique appears, for the time being, to have limited usage for enthalpy relaxation studies. Glass transition; Enthalpy relaxation; Fast scanning calorimetry; Thermal gradients

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