Li Xinshu, Wang Qing, Wu Dongyang, Li Tingqu, Zhang Peng, Bai Jingru, Zhang Xu
Engineering Research Centre of Oil Shale Comprehensive Utilization, Ministry of Education, Northeast Electric Power University Jilin 132012 Jilin PR China
School of Mechanical and Electrical Engineering, Jilin Institute of Chemical Technology Jilin 132022 Jilin PR China.
RSC Adv. 2025 May 16;15(21):16375-16391. doi: 10.1039/d5ra02224j. eCollection 2025 May 15.
The purpose of this study is to understand the changes in the performance of polyamide 6 (PA6) as a liner material under short-term thermal oxidation conditions. PA6 samples were subjected to oxidation at temperatures ranging from 90-150 °C for durations between 5-20 hours. Tensile, bending, and impact tests were conducted to evaluate changes in mechanical properties, while thermal analyses, including Fourier Transform Infrared Spectroscopy (FTIR), Thermogravimetric Analysis (TGA), and Differential Scanning Calorimetry (DSC), were performed to explore thermal stability and crystallization behavior. The results revealed that short-term thermal oxidation significantly influenced the ductility, tensile strength, and impact resistance of PA6, with marked decreases in these properties under higher oxidation temperatures and prolonged oxidation times. The material showed a clear embrittlement transition at 150 °C, with notable declines in tensile elongation and impact strength. The formation of carbonyl groups, particularly aldehydes and ketones, was accelerated by increased oxidation temperature and time, suggesting a correlation between thermal oxidation and chemical aging. Thermal analysis demonstrated a decline in thermal stability, characterized by reduced initial decomposition temperature ( ), maximum decomposition rate temperature ( ), and end decomposition temperature ( ) with increased oxidation severity. Meanwhile, crystallinity and melting enthalpy increased due to partial recrystallization during the oxidation process. These findings highlight the sensitivity of PA6 to thermal oxidation, underlining the importance of controlling oxidative conditions to maintain material performance. The study suggests the necessity for thermal management strategies and antioxidant incorporation to enhance the durability of PA6 for hydrogen storage applications, where exposure to elevated temperatures is inevitable.
本研究的目的是了解聚酰胺6（PA6）作为衬里材料在短期热氧化条件下性能的变化。将PA6样品在90 - 150°C的温度下氧化5 - 20小时。进行拉伸、弯曲和冲击试验以评估机械性能的变化，同时进行热分析，包括傅里叶变换红外光谱（FTIR）、热重分析（TGA）和差示扫描量热法（DSC），以探索热稳定性和结晶行为。结果表明，短期热氧化显著影响PA6的延展性、拉伸强度和抗冲击性，在较高氧化温度和较长氧化时间下这些性能明显下降。该材料在150°C时出现明显的脆化转变，拉伸伸长率和冲击强度显著下降。氧化温度和时间的增加加速了羰基的形成，特别是醛和酮，这表明热氧化与化学老化之间存在关联。热分析表明热稳定性下降，其特征是随着氧化程度的增加，初始分解温度（ ）、最大分解速率温度（ ）和最终分解温度（ ）降低。同时，由于氧化过程中的部分再结晶，结晶度和熔化焓增加。这些发现突出了PA6对热氧化的敏感性，强调了控制氧化条件以维持材料性能的重要性。该研究表明有必要采取热管理策略并加入抗氧化剂，以提高PA6在储氢应用中的耐久性，因为在储氢应用中不可避免地会暴露在高温下。
