Dynamic methods for the kinetic analysis of the thermal degradation of polytetrafluoroethylene

الملخص EN

A kinetic study has been carried out on the thermal degradation of polytetrafluoroethylene.

The thermal degradation analysis has been done using a thermogravimetric balance from 25°C to 950°C in nitrogen gas at different heating rates, viz.

10, 20, 30 and 50 °C min-1.

The maximum rate of degradation increased from 16.6 to 38.5% weight loss min-1 as the heating rate increased from 10 to 30 °C min-1 and remained constant thereafter.

The TGA plots showed that 92% to 97% of the sample decomposed between 460°C and 680 °C.

Integral and differential methods were used for the determination of the kinetic parameters.

The differential method of Achar was found the most suitable amongst the four methods used, for the determination of the kinetic triplet.