Abstract
The temperature modulated differential scanning calorimetry (TMDSC) technique can be used for heat capacity spectroscopy in the low frequency range. Measured property is the complex heat capacity C *=C′−iC″. The frequency dependent relaxation transition measured by TMDSC occurs in the temperature range of the thermal glass transition. Thus, the non-equilibrium of the glassy state influences the TMDSC curves. An experimental evidence is the dependence of the shape of the C′-curve on the thermal history. A theoretical description of the influence of the non-equilibrium state on the spectroscopic curves is presented. This description is based on the Tool–Narayanaswamy–Moynihan model.
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