Modulated differential scanning calorimetry in the glass transition region |
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| Authors: | B. Wunderlich A. Boller I. Okazaki S. Kreitmeier |
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| Affiliation: | (1) Department of Chemistry, The University of Tennessee, 37996-1600 Knoxville, TN;(2) Chemistry and Analytical Sciences Division, Oak Ridge National Laboratory, 37831-6197 Oak Ridge, TN, USA;(3) Present address: Polymerphysik, University at Regensburg, D-93040 Regensburg, Germany |
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| 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.Presented in part at the 24th Conference of the Northamerican Thermal Analysis Society, San Francisco, CA, September 10–13, 1995. |
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| Keywords: | activation energy calorimetry glass transition heat capacity heat flow calorimeter hole theory irreversible thermodynamics TMDSC modulated calorimetry |
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