Nonisothermal DTA

The temperature of maximum transformation rate is easily determined using either of two similar techniques called differential scanning calorimetry (DSC) or differential thermal analysis (DTA). These techniques are extremely useful in the kinetic study of both isothermal and nonisothermal phase transformations. 

So far the crystallization kinetics of HMFG have been less studied. Both continuous heating and isothermal experiments have been performed using DTA or DSC techniques. Bansal et al. (1983) studied the crystallization kinetics of a ZBL glass by means of isothermal and nonisothermal DSC heating above T. Under isothermal conditions, the volume fraction cc crystallized after a time t was found to follow the Avrami equation. 

For coarse estimations of danger levels in corrosion nonisothermal thermogravimetry or differential thermal analysis (DTA) can be used. 

The most common methods coupled with the three mentioned tests are those also used for evaluating thermal and thermo-oxidative stability, namely measurement of the oxidation induction period by the oxygen uptake test, manometry, DTA, DSC, TG, EGA and EGD in isothermal and nonisothermal (dynamic) conditions oven aging in static or circulating air at 50-150°C, chromatography UV, IR, ESR, NMR spectroscopy, chemiluminescence, viscosimetry, mechanical indices determination, etc. Other criteria refer to discoloration, embrittlement, cracking, loss of elongation, etc. Hydroperoxides concentration can... 

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