Heat flow phase angle signal

The information available in the heat capacity evolution is a key factor for the correct interpretation of the heat flow signal. The results indicate that the heat flow phase angle contains interesting information regarding the rheological state of the reacting material and especially about the occurrence of relaxation phenomena. 

The simultaneous measurement of the amplitude (modulus) of the complex heat capacity, the heat flow and the phase angle between heat flow and heating rate (termed heat flow phase) enables a more detailed study of complicated material systems, both in quasi-isothermal and non-isothermal conditions. The extraction of the signals is briefly summarised below. More details on theory and applications are given in dedicated special issues of Thermochimica Acta [6,7] wid Journal of Thermal Analysis and Calorime-try [8] and in other chapters of this book. 

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