主管:中华人民共和国应急管理部
主办:应急管理部天津消防研究所
ISSN 1009-0029  CN 12-1311/TU

Fire Science and Technology ›› 2021, Vol. 40 ›› Issue (8): 1232-1235.

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Effect of trace Fe3+ on kinetics of thermal  decomposition of dicumyl peroxide

QIN Zhi-yi, FU Shi-jun, LIU Hui-ping,  LIU Zhang-rui   

  1. School of Urban Construction and Safety Engineering, Shanghai Institute of Technology, Shanghai 201418, China

  • Online:2021-08-15 Published:2021-03-15

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 (Tp) 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 (TMRad) 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 TMRad of DCP containing Fe3+ decreased obviously.

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