New approximate formula for Arrhenius temperature integral

Isoconversional Methodology

“…Circles represent the actual values of ln A j and E j estimated by a single-heating-rate method (e.g., Eq. 2.27) while using different reaction models [59], who also demonstrated that highly accurate values of the preexponential factor can be obtained when one evaluates the parameters of the compensation effect from only four pairs of A j and E i estimated by the single-heating-rate method of Tang et al [62] when using the reaction models of Mampel (F1) and Avrami-Erofeev (A2, A3, A4).…”

Non-isothermal degradation kinetics of filled with rise husk ash polypropene composites

“…Later, a number of authors [35][36] suggested different solutions for the temperature integral in Equation (8), insisting that they increase the accuracy with which the kinetic parameters are calculated. For instance, Madhysudanan -KrishnanNinan [35] suggested the Equation (16): (16) Tang et al [36] offered another kinetic equation (17): (17) and Wanjun et al [37] used the Equation (18): (18) Equations (15-18) suggest certain differences between the calculated values of the apparent activation energy E and pre-exponential factor A even when the same g(α) function is used. To estimate which of these four calculation procedures would be most adequate for the computations, the maximum value of the linear regression correlation coefficient R 2 was used.…”

“…Subsequently, the apparent activation energy E and the pre-exponential factor A can be calculated from the slope and intercept of the fitted straight line. The same method was used to process the data from the TG curves of the composites studied, using the calculation procedures of Madhysudanan et al [35], Tang et al [36] and Wanjun et al [37]. The results obtained are summarized in Table 4.…”

Thermal degradation of random copolyesters based on 1,4-butanediol, terepthalic acid and different aliphatic dicarboxylic acids

“…Nowadays, different methodologies have been proposed as more accurate (e.g. Madhysudanan [40], Tang [41] and Wanjun [42] methodologies). Nevertheless, discrimination between the different possible models could be effectively performed in our case since selection was finally based on the closeness between the derived activation energies and those experimentally determined, which in all cases pointed out to only one possible mechanism.…”