Determination of Activation Energy of Polyamide-imide Decomposition Reaction by Thermogravimetry
Polyamide-imide(PAI)is a kind of amorphous thermoplastic polymer with alternating amide and imide bonds in the molecule.The thermal stability of PAI materials determines its reliability in processing and application,but there are relatively few studies on the thermal decomposition kinetics of PAI at present.The activation energy of the thermal decomposition reaction was calculated according to the Ozawa-Flynn-Wall method by performing thermogravimetric analysis experiments on commercially available PAI samples and PAI samples produced by the institute at different heating rates of 5,10 and 15℃/min,respectively.The activation energy of the commercially available PAI particle sample was Ea=343.70 J·mol-1,the particle sample produced by the institute was Ea=318.29 J·mol-1 and the powder sample was Ea =233.92 J·mol-1.The results show that the thermal decomposition stability of PAI samples produced by the institute is basically the same as that of commercial PAI samples,and the sample processing method has an important influence on thermal decomposition temperature.The bulk density of commercial particle samples is 1.384 5 g·cm-3,which is higher than that of domestic sample 1.226 g·cm-3,and the thermal decomposition temperature is higher and the activation energy is higher.
poly(amide-imide)thermogravimetryactivation energy
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