A measuring technique has been developed whereby thermodilatometric examinations can be carried out at a strictly constant rate, slower by one or two orders of magnitude than that of conventional measurements. Under the special conditions the temperature of the sample changes in a special way. The TD curve recorded as a function of this temperature yields new information about the kinetics and mechanism of the structural changes taking place within the sample.
The author gives a detailed survey on thermogravimetric investigations under quasi-isothermal — quasi-isobaric conditions (Q-TG). According to the principle of the technique the heating of the sample is governed by the transformation itself according to the feed-back principle in a way that the transformations should take place at a strictly constant rate, slower by orders of magnitude than in the case of the conventional techniques. Due to this, the transformations take place under ideal conditions, near to physico-chemical requirements.Based on the obtained advantageous results further methods were elaborated, like thermo-dilatometry (Q-TD), evolved gas analysis (Q-EGA) and microdistillation under quasi-isothermal conditions.The second part of the present review deals with DTA and DSC techniques under quasi-isothermal conditions elaborated recently