A simple and precise differential incremental isoconversional method to kinetic analysis of heterogeneous processes under arbitrary temperature programs

Highlights: • A simple and precise differential incremental isoconversional method. • Application of the method for data obtained under constant heating rates programs. • Application of the method for data obtained under arbitrary temperature programs. • Comparison of results obtained by some isoconversional methods. - Abstract: A simple and precise linear differential incremental isoconversional (model-free) method for kinetic analysis of heterogeneous processes using thermoanalytical data recorded at arbitrary temperature programs has been suggested. This method has been applied to simulated data corresponding to a single-step process and to a complex process consisting in two consecutive reactions, and experimental data corresponding to thermal degradation of high density polyethylene (HDPE). The obtained results are consistent with those from other isoconversional methods (advanced isoconversional method suggested by Vyazovkin, iterative method suggested by Budrugeac and differential isoconversional method suggested by Friedman).