Kinetic Study on Pyrolysis of Polyphenylene Sulfide under Different Oxygen Concentrations

摘要

Kenitic of thermal degradation of PPS were studied undernitrogen, oxygen and airin formal works. The integral Coats-Redfern method based on single heating rate is employed for the kinetic analysis of the pyrolysis processunder different oxygen concentrations. The results indicated that only one stage occurred under pure nitrogen atmos-phere while two stages occurred under oxidative atmosphere. Maximal mass loss rate and apparent activation energy of the first stage varies little (Maximal mass loss rate of first degradation stage stabilizes (4.3±0.5)%·min~(-1), and apparent activation energy of the first degradation stage fluctuate around 170kJ·mol~(-1)) while corresponding kinetic parameters of the second stage increase linearly with increasing oxygen concentrations (at 10%, 20%, 30%, 40%, 50%, 60%), in addition, apparent kinetic compensation effect of PPS under oxidative atmosphere was also discovered and discussed. The isokinetic temperature TS is 505°C and 522.4°C respectively with heating rate of 10k·min~(-1) and 20 k·min~(-1).