Abstract
In a previous paper (Thermochim. Acta 670 (2018) 1–6) it was shown that the estimation of errors (ΔE) in the determination of apparent activation energies (E) determined by a nonlinear isoconversional method applied for thermoanalytical measurements performed under constant heating rates involves the following successive steps: (1) the determination of Fisher confidence interval (ΔFE) for confidence level of 95 % by applying the procedure suggested by Vyazovkin and Wight, and (2) the application of the relation: ΔE=0.2447×ΔFE+0.00037×ΔFE2. The check of this procedure when using advanced nonlinear incremental isoconversional method (A-NL method) suggested by Vyazovkin is applied for thermoanalytical data under arbitrary temperature programs has been performed for: simulated sinusoidal modulated data, thermogravimetric (TG) data for thermal decomposition of a sort of high density polyethylene (HDPE) under quasi-isothermal conditions, and TG data corresponding to thermal decomposition of a sort of low density polyethylene under arbitrary temperature programs. It has been concluded that the suggested procedure for estimating the error in E evaluation based on above relationship is also applicable when A-NL method is used for kinetic analysis of thermoanalytical data recorded under arbitrary temperature programs.
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