Kis Dávid István, Bata Attila, Takács János, Kókai Eszter
Department of Automotive Technologies, Faculty of Transportation Engineering and Vehicle Engineering, Budapest University of Technology and Economics, Műegyetem rkp. 3, H-1111 Budapest, Hungary.
Department of Innovative Vehicles and Materials, GAMF Faculty of Mechanical Engineering and Computer Science, John von Neumann University, H-6000 Kecskemét, Hungary.
Nanomaterials (Basel). 2024 Aug 25;14(17):1385. doi: 10.3390/nano14171385.
This study focuses on polyamide 6/organo-modified montmorillonite (PA6/OMMT) nanocomposites as potential liner materials, given the growing interest in enhancing the performance of type IV composite overwrapped hydrogen storage pressure vessels. The mechanical properties of PA6/OMMT composites with varying filler concentrations were investigated across a temperature range relevant to hydrogen storage conditions (-40 °C to +85 °C). Liner collapse, a critical issue caused by rapid gas discharge, was analyzed using an Ishikawa diagram to identify external and internal factors. Mechanical testing revealed that higher OMMT content generally increased stiffness, especially at elevated temperatures. The Young's modulus and first yield strength exhibited non-linear temperature dependencies, with 1 wt. per cent OMMT content enhancing yield strength at all tested temperatures. Dynamic mechanical analysis (DMA) indicated that OMMT improves the storage modulus, suggesting effective filler dispersion, but it also reduces the toughness and heat resistance, as evidenced by lower glass transition temperatures. This study underscores the importance of optimizing OMMT content to balance mechanical performance and thermal stability for the practical application of PA6/OMMT nanocomposites in hydrogen storage pressure vessels.
鉴于人们对提高IV型复合缠绕储氢压力容器性能的兴趣与日俱增，本研究聚焦于聚酰胺6/有机改性蒙脱土（PA6/OMMT）纳米复合材料作为潜在的内衬材料。研究了不同填料浓度的PA6/OMMT复合材料在与储氢条件相关的温度范围（-40°C至+85°C）内的力学性能。内衬坍塌是由快速气体排放引起的关键问题，使用石川图分析以识别外部和内部因素。力学测试表明，较高的OMMT含量通常会提高刚度，尤其是在高温下。杨氏模量和首次屈服强度表现出非线性温度依赖性，1 wt.%的OMMT含量在所有测试温度下均提高了屈服强度。动态力学分析（DMA）表明，OMMT提高了储能模量，表明填料分散有效，但也降低了韧性和耐热性，较低的玻璃化转变温度证明了这一点。本研究强调了优化OMMT含量以平衡力学性能和热稳定性对于PA6/OMMT纳米复合材料在储氢压力容器中的实际应用的重要性。
