Modulated differential scanning calorimetry in the glass transition region
Modulated differential scanning calorimetry in the glass transition region
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DOI：
10.1007/bf01979445
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发表时间：
1996-10
期刊：
影响因子：
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通讯作者：
B. Wunderlich;A. Boller;I. Okazaki;Stefan Kreitmeier
中科院分区：
文献类型：
--
作者：
B. Wunderlich;A. Boller;I. Okazaki;Stefan Kreitmeier
温度调制差示扫描量热法（TMDSC）是基于热流，并代表一个线性系统的测量热容。只要测量在接近稳定状态下进行，并且样品内仅存在可忽略的温度梯度，就可以收集作为调制频率的函数的定量数据。应用于玻璃化转变，这种测量允许确定材料的动力学参数。基于液体空穴理论或不可逆热力学，导出了描述表观热容随频率变化的必要方程。
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.