英语翻译During thethermal degradation of XPS,the activation ener

英语翻译
During thethermal degradation of XPS,the activation energy increases before a= 0.25 andthen the value stabilizes in the range of 220–230 kJ·mol−1.Through theentire process,the E values of XPS are always smaller than that of EPS andthey show different dependence on the degree of conversion.This reveals thatunder nitrogen environment,the thermal degradation of XPS is easier than EPS.In the range of a=0.1–0.85 for thermal degradation of EPS,the differences ofactivation energies are very small in regard to experimental errors and the average value of E is about245 kJ·mol−1,thus we can regard the value of E as a constant.It indicates that the thermaldegradation process of EPS in a nitrogen environment can be approximated as asingle reaction step.At the initial and final stage of the reaction of thethree materials,the change of E values is larger and the results show a highstandard.