A model-free method for evaluating theoretical error of Kissinger equation

Kissinger equation is widely used to calculate the activation energy. However, since a number of assumptions and approximations are introduced in the derivation, the activation energy resolved by this method will have some errors. Here, we propose a model-free evaluation method to estimate the relative error of activation energy of Kissinger equation. Our work shows that the error in activation energy solved by Kissinger equation is not only related to the magnitude of x = E/RT, but also depended on the change of β and ?x = x ₁ ? x ₂. From the experimental and theoretical analysis on the degradation of polyamide-6, it can be found that the actual error and the theoretical error in the activation energy solved by Kissinger equation are almost same.