Abstract:

In order to study the effect of trace iron ions (Fe³⁺) on the thermal decomposition kinetics of Dicumyl Peroxide, the thermal decomposition characteristics of DCP containing trace Fe³⁺ under isothermal and dynamic heating conditions were measured by differential scanning calorimeter (DSC), and the results were analyzed by kinetic analysis software(Kinetics Neo), and compared with the corresponding results of pure DCP. The results of isothermal DSC showed that the decomposition process of the two samples followed the n-order kinetic law; the dynamic DSC test results showed that the presence of trace Fe³⁺ has little effect on initial decomposition temperature(T₀) and peak temperature (T_p) of DCP, but has great influence on average specific heat release (ΔHr). For example, theΔHrof DCP containing Fe³⁺ was 745.4 J/g, but that of pure DCP was 977.1 J/g. Kinetic Neo software analysis results show that the kinetic parameters obtained by Friedman method and model fitting method are similar. Based on the kinetic parameters of thermal decomposition obtained by the model fitting method, the temperature corresponding to the maximum reaction rate reaching time (TMR_ad) of the two samples under adiabatic condition was predicted. The results showed that, compared with that of the chemical pure DCP, the temperature corresponding to different TMR_ad of DCP containing Fe³⁺ decreased obviously.

Key words:  dicumyl peroxide, iron ion, differential scanning calorimeter, thermal decomposition kinetics