Thermal degradation kinetics and lifetime prediction of poly(aryl ether ketone)s containing 2,6‐naphthalene moieties

Abstract

The kinetics of thermal degradation and lifetime of poly(aryl ether ketone) containing 2,6-naphthalene moieties (PANEK) in nitrogen and in air were studied with dynamic thermogravimetry. The results showed that the thermal stability of PANEK in air was substantially less than that in nitrogen. The kinetic parameters for PANEK, including the activation energy, the reaction order; and the frequency factor of the degradation reaction, were analyzed with the Ozawa method. The lifetime of PANEK decreased gradually from 1.09 Â 10 7 to 0.65 Â 10 2 min as the temperature increased from 200 to 400 C in air and from 2.12 Â 10 8 to 3.30 Â 10 2 min in nitrogen. These lifetime parameters indicated that the service/process temperature had a strong influence on PANEK.

Thermal decomposition of pyridoxine: an evolved gas analysis‐ion attachment mass spectrometry study

“…A number of instrumental methods, including differential scanning calorimetry, differential thermal analysis, thermogravimetric analysis, and pyrolysis‐gas chromatography–mass spectrometry (Pyr‐GC‐MS), have been used to study the thermal decomposition and thermal decomposition kinetics for different materials, mainly polymers and drugs and their metabolites . However, some disadvantages of these techniques are well known.…”

“…[6] Pyridoxine is stable in most strong acids and bases during boiling processes; however, during boiling in an oxidizing acid, pyridoxine is degraded through oxidation. In various pharmaceuticals, such as multivitamin tablets, capsules, or vitamin B complex tablets, the amount of pyridoxine decreased only slightly or not at all when they were held at 45 C for 500 h. [7] A number of instrumental methods, including differential scanning calorimetry, differential thermal analysis, thermogravimetric analysis, and pyrolysis-gas chromatography-mass spectrometry (Pyr-GC-MS), have been used to study the thermal decomposition and thermal decomposition kinetics for different materials, mainly polymers [8][9][10] and drugs and their metabolites. [11][12][13][14] However, some disadvantages of these techniques are well known.…”