This paper is devoted to the impact of oxygen diffusion on thermal ageing of PA-6,6. Samples were subjected to ageing in air at temperatures ranging from 140°C to 200°C for different times. Depth profiling methods using AFM measurements were developed to characterise the heterogeneity of the thermal and mechanical properties of the oxidised polymer. A comparison of the results obtained with micro-FTIR profiles was performed to correlate the chemical and physical changes induced by oxidation (i.e., from molecular to macroscopic scales). As a result of diffusion-limited oxidation (DLO), it was shown that polymer oxidised much faster at the surface than in the bulk.

本文致力于氧扩散对 PA-6,6 热老化的影响。样品在空气中在 140°C 至 200°C 的温度范围内老化不同时间。开发了使用 AFM 测量的深度分析方法来表征氧化聚合物的热和机械性能的异质性。将获得的结果与微 FTIR 曲线进行比较，以关联氧化引起的化学和物理变化（即从分子到宏观尺度）。作为扩散限制氧化 (DLO) 的结果，表明聚合物在表面的氧化速度比在本体中的氧化速度要快得多。