A COMPARISON OF DIFFERENT EVALUATION METHODS IN MODULATED TEMPERATURE DSC

被引:203
作者
SCHAWE, JEK
机构
关键词
GLASS TRANSITION; HEAT CAPACITY; MODULATED DSC; TIME-DEPENDENT REACTIONS;
D O I
10.1016/0040-6031(95)02294-C
中图分类号
O414.1 [热力学];
学科分类号
摘要
Modulated temperature-DSC is a new method for measuring the thermal behaviour of materials. In this method, the response of the sample to a time-dependent signal (sinusoidal temperature change) is measured. Two different methods are known for the evaluation of the measured data. The first is the separation of the measured data into reversing and non-reversing components of heat flow. The second is based on the linear response theory and yields a complex heat capacity with a real part (storage heat capacity) and an imaginary part (loss heat capacity). The theoretical basis and the possibilities of interpretation of both evaluation methods are investigated. The results of both methods are compared theoretically for the case of simple time-dependent processes. Experimental results are given for the glass transition process.
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页码:1 / 16
页数:16
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