Abstract
Differential scanning calorimetry (DSC) and quantitative differential thermal analysis (DTA) are widely used to determine the crystallinity of semicrystalline polymers according to the so-called “calorimetric method”. The procedure involves the determination of the heat of fusion of the polymer sample which is usually determined by measurement of the area of the melting peak above a somewhat arbitrarily interpolated baseline. In many cases the results depend strongly on the operator's estimate of the “correct” baseline position. In other cases crystallization and recrystallization effects during the heating but prior to melting render baseline methods fundamentally unsound. The theory of the calorimetric method is applied to DSC data show that simple baseline interpolation is rarely permissible in polymer heat of fusion measurements, and a generally applicable procedure is suggested which involves the measurement of the total energy absorbed in the melting region.
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