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Nonisothermal reaction kinetics of a commercial DOPO-modified epoxy novolac (PEN) with 4,4'-diaminodiphenylmethane (DDM) was systematically investigated with a differential scanning calorimeter (DSC) according to the model-fitting and model-free advanced isoconversional methods.It was found that increasing the heating rate led the reaction exothermic peak to at a higher temperature with broadened areas,but the reaction enthalpy (-91-94kJ/mol) and the glass-transition temperatures of the cured resins (133.4-135.8 ℃) changed slightly.The global reaction activation energy determined with the Kissinger method was 53.6 kJ/mol,and the SB(m,n) model was confirmed to be able to well model the reaction rate.Furthermore,the effective activation energy as a function of conversion of epoxy groups was determined with the advanced isothermal conversional method (AICM),on the basis of which the reaction mechanisms was discussed in detail.