Modulated differential scanning calorimetry, thermal glass transition

As an independent experiment to verify the findings of the TDBS we also performed quasi adiabatic measurements of the specific heat capacity Cp (74) using modulated differential scanning calorimetry (N SC) (20-22). Usually the glass transition is characterized by a step like behavior of Cp(T). The thermal glass transition... 

Wunderlich B, Boiler A, Okazaki I, Kreitmeier S (1996) Modulated Differential Scanning Calorimetry in the Glass Transition Region II. The Mathematical Treatment of the Kinetics of the Glass Transition. J Thermal Anal 47 1013-1026. 

Temperature-modulated differential scanning calorimetry (T-MDSC) applies a thermal modulation in temperature to a conventional DSC mn and determines a dynamic heat capacity from the relationship between the modulation components of temperature and of heat flow. Primary application of this technique has been the measurement of specific heat capacity and the examination of the anomaly in a relaxation process such as alpha process related to the glass transition. An application to the first-order phase transitions of crystallisation and melting of polymer crystals has recently been suggested. The method and typical results are described. 13 refs. 

DTA (Differential Thermal Analysis) and DSG (Differential Scanning Calorimetry) measure the thermal transitions in materials by monitoring temperatures and heat flows. DTA is qualitative while DSC is quantitative. Glass transition temperatures, phase changes, heat capacity, cure kinetics and thermal degradation can be monitored by these techniques. Modulated DSC can be both faster and more accurate. 

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