Abstract
Temperature-modulated differential scanning calorimetry (DSC) allows for the investigation of the glass transition in two different time scales. One is related to the response on the periodic temperature perturbation (10 −4 Hz < ν < 10 −1 Hz), the other to the vitrification due to cooling at a linear rate. The latter is equivalent to the glass transition observed in DSC cooling experiments. By varying modulation frequency and cooling rate it is possible to compare directly the corresponding time scales. In the case of vitrification the frequency related to the cooling rate can be estimated. The results from different organic and inorganic compounds are in agreement with the predictions of Donth's fluctuation approach to glass transition.
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