In this work, the thermo-oxidative behavior of PEKK films (∼50 µm thick) in solid state were investigated. Since the mechanical properties of PEKK samples, especially the strain at break, are clearly affected after long ageing time, the modifications of the PEKK structure have been monitored at the molecular and the macromolecular scales using different techniques such as gel permeation chromatography, X-Ray scattering, differential scanning calorimetry, and dynamic mechanical analysis. If the embrittlement of the PEKK specimens seems to appear due to a predominant branching/cross-linking phenomenon occurring at the macromolecular scale, crystalline morphology is also slightly modified due to a chain scission mechanism occurring simultaneously.

在这项工作中，研究了固态PEKK膜（约50 µm厚）的热氧化行为。由于长时间老化后PEKK样品的机械性能（尤其是断裂应变）受到明显影响，因此已使用不同的技术（例如凝胶渗透色谱法，X射线分析）在分子和大分子尺度上监测了PEKK结构的修饰。散射，差示扫描量热法和动态力学分析。如果PEKK标本的脆化似乎是由于在大分子尺度上发生的主要支链/交联现象而出现的，则由于同时发生断链机理，晶体形态也略有改变。