Thermal degradation of poly(p-phenylenebenzobisoxazole) and poly(p-phenylenediamine terephthalamide) fibres

摘要

This study investigates the thermal stability of poly(p-phenylenediamine-terephtalamide) (PPT) and poly(p-phenylenebenzobisoxazole) (PBO) fibres. Excellent behaviour of PBO is shown in comparisomn to that of PPT. The thermal stability (under pyrolytic or thermo-oxidative conditios) of PBO is 150 deg C higher than that of PPT. Moreover, the strong influence of oxygen, which plays the role of an initiator of degradation, onthe degradation of fibres is shown. Using the invariant kinetic parameter (IKP) method, it is shown that the degradation rate of PBO is strongly reduced in can explain the high fire performance of PBO compared to PPT.