The effect of the simultaneous variation of sample mass and heating rate in DTA and DSC

Abstract

Quantitative correlations between kinetic parameters (energy of activation, E), procedural factors (sample mass, m, and heating rate, φ) and the dependent variables (the temperature of inception of reaction, T i, and temperature T α at which a constant fraction α has decomposed) have been derived for differential thermal analysis (DTA) and differential scanning calorimetry (DSC). The relations have the same form as those derived from earlier TG studies. The dependent variables T i and T α are related to m, φ and E by the equations ▪ where C 3 and C 2 are constants, and ▪ where C 4 and C 5 are constants for a given α. The variation of C 5 with α is given by C 5 = a + b α where a and b are constants. The equations are applicable to TG, DTA and DSC.