A general solution of the closed-loop kinetic scheme for the thermal oxidation of polypropylene

摘要

A general solution of the closed-loop kinetic scheme for the thermal oxidation of hydrocarbon polymers is presented in which no assumptions are made concerning the concentration of oxygen, the kinetic chain length, the ratio of termination rate constants or the existence of as steady-state for the concentration of radicals. The proposed model is used to simulate the thermal oxidation of unsta- bilized polypropylene films under ambient air at 80-150 deg. C, with reaction and diffusion parameters that result in realistic estimates of induction times, hydroperoxide concentrations and oxygen uptakes.