ISSN:
1572-8943
Schlagwort(e):
activation energy
;
calorimetry
;
glass transition
;
heat capacity
;
heat flow calorimeter
;
hole theory
;
irreversible thermodynamics
;
TMDSC
;
modulated calorimetry
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Chemie und Pharmazie
Notizen:
Abstract Temperature-modulated differential scanning calorimetry (TMDSC) is based on heat flow and represents a linear system for the measurement of heat capacity. As long as the measurements are carried out close to steady state and only a negligible temperature gradient exists within the sample, quantitative data can be gathered as a function of modulation frequency. Applied to the glass transition, such measurements permit the determination the kinetic parameters of the material. Based on either the hole theory of liquids or irreversible thermodynamics, the necessary equations are derived to describe the apparent heat capacity as a function of frequency.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF01979445
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