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Thermal behavior study and degradation mechanism by TG/MS/FTIR technique of some poly(aryl ether ether ketone)s

机译:一些聚(芳基醚醚酮)的Tg / MS / FTIR技术的热行为研究和降解机理

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摘要

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 H-1 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.
机译:该研究评估了一些芳族聚(芳基醚醚酮)的热和热氧化稳定性以及通过Tg / MS / FTIR技术(同时质谱和傅立叶变换从热量标注的废气的傅立叶变换红外光谱的劣化机理分析仪),在两个工作环境中,空气和氦气。这种类型的聚合物用于电子,汽车和空气空间领域的许多应用中。通过4,4'-二氟代苯酮的缩聚反应合成聚合物,其中几个双酚,例如9,9-双苯基)芴,4,4'-环己基苯酚,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。它们的特征在于FTIR和H-1 NMR光谱,溶解度,固有粘度和热重分析。此外,在空气中和惰性气氛(氦气)中测定聚合物热分解的主要产物。分析样品的降解机制受其结构和工作大气的影响。分子动力学模拟还用于评估聚合物的热稳定性。

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