Single Pulse Shock Tube Studies on the Decomposition of Fluoropolymers

This paper is concerned with the kinetics of thermal decomposition of polytetrafluroethylene at high temperature. Powder of spherical polytetrafluoroethylene, radius 10μm and 70μm are decomporsed in a single pulse shock tube with argon as working gas. The duration of the heating time is 500μs. The result is described as surface degradation rate constant.
ω_δ=1.6exp（-18400/RT）g·cm^-2·s^-1（1400K＜T＜3300K）.
This is quite different with theory given by Steg and Lew based on the experiment study of Madorsky et al. We have pointed that the difference are caused by the effects of diffusion process and reverse depolymerazation of the monomer in the specimen of our experiment as the temperature is high while the scale of specimen is large enough.