Abstract This study assesses the thermal and thermo-oxidative stability of some aromatic poly(aryl ether ether ketone)s as well as the degradation mechanism by the TG/MS/FTIR technique (simultaneous mass spectrometry and Fourier transform infrared spectroscopy of off-gases from thermogravimetric analyzer), in two working atmospheres, air and helium. This type of polymers is used in many applications in the electronic, automotive and aerospatial fields. The polymers were synthesized by polycondensation reaction of 4,4′-difluorobenzophenone with several bisphenols, such as 9,9-bis(4-hydroxyphenyl)fluorene, 4,4′-cyclohexylidenebisphenol, 2-(bis[4-hydroxyphenyl]methyl)benzoic acid (phenolphthalin) and 2,5-bis(4-hydroxyphenyl)-1,3,4-oxadiazole. They were characterized by FTIR and 1H NMR spectroscopy, solubility, inherent viscosity and thermogravimetric analysis. Moreover, the main products of polymer thermal decomposition were determined in air and in inert atmosphere (helium). The degradation mechanism of the analyzed samples is influenced by their structure and working atmosphere. Molecular dynamics simulation was also used to evaluate thermal stability of the polymers.

中文翻译：

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TG/MS/FTIR 技术研究某些聚芳醚醚酮的热行为及降解机理

摘要 本研究通过 TG/MS/FTIR 技术（同时质谱法和傅里叶变换红外光谱法）评估了一些芳族聚（芳醚醚酮）的热稳定性和降解机制。热重分析仪），在两种工作环境中，空气和氦气。这种类型的聚合物用于电子、汽车和航空领域的许多应用。聚合物是通过 4,4'-二氟二苯甲酮与几种双酚的缩聚反应合成的，如 9,9-双（4-羟基苯基）芴、4,4'-亚环己基双酚、2-（双[4-羟基苯基]甲基）苯甲酸（酚酞）和 2,5-双（4-羟基苯基）-1,3,4-恶二唑。它们通过 FTIR 和 1H NMR 光谱、溶解度、特性粘度和热重分析。此外，聚合物热分解的主要产物是在空气和惰性气氛（氦气）中测定的。分析样品的降解机制受其结构和工作环境的影响。分子动力学模拟也用于评估聚合物的热稳定性。