Differential Enthalpic Analysis as a Calorimetric Method: Evaluation by a Statistical Design
Quantitative data on the heat or enthalpy of crystallization, fusion, crosslinking, decomposition and other polymer transformations are invaluable for the elucidation of reactions and reaction mechanisms as well as for quantitative characterization. However, there is a great paucity of calorimetric data on polymer reactions in the literature because previous investigators were forced to rely largely upon the relatively cumbersome and tedious technique of adiabatic calorimetry for such information. As a consequence, polymer scientists generally eschewed the calorimetric approach, relying upon other types of data in studies of polymer transitions and reactions. Therefore, the successful application of differential thermal methods as rapid and reliable calorimetric techniques represents an important breakthrough in polymer analysis. Differential enthalpic analysis1, DEA, or differential scanning calorimetry as it is also known, provides the most direct information and a commercial instrument is available2. Since the DEA curve reflects heat flow in millicalories per second as a function of the programmed temperature, it follows that the area of an exothermic or endothermic peak is directly proportional to the enthalpy of transformation.
KeywordsDifferential Scanning Calorimetry Calibration Constant Calorimetric Method Adiabatic Calorimetry Textile Research Institute
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