Dong Chufeng, Liu Yitao, Li Jiepu, Bin Guangfu, Zhou Chilou, Han Wulin, Li Xiang
Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment, Hunan University of Science and Technology, Xiangtan 411201, China.
China Special Equipment Inspection and Research Institute, Beijing 100029, China.
Polymers (Basel). 2023 Sep 10;15(18):3715. doi: 10.3390/polym15183715.
As a commonly used liner material for fully reinforced, carbon-fiber-composite hydrogen storage cylinders, polyamide 6 (PA6) needs to meet the required hydrogen permeation index during use; otherwise, it may adversely affect the safe use of hydrogen storage cylinders. The hydrogen permeability of PA6 under different temperatures and pressures was tested, and the variations in its hydrogen permeability were investigated. Additionally, the hydrogen permeability of PA6, polyamide 11 (PA11), and high-density polyethylene (HDPE) at a temperature of 288 K and a pressure of 70 MPa was tested, and the differences in hydrogen permeability among these commonly used liner materials for type IV on-board hydrogen storage cylinders were studied. The results reported herein indicate that both the hydrogen permeability and diffusion coefficient of PA6 increase with rising test temperature but decrease with increasing pressure. The solubility coefficient of PA6 shows no significant change with varying test temperatures and pressures. At a test temperature of 288 K and a pressure of 70 MPa, among the three materials, PA6 has slightly stronger hydrogen permeation resistance than PA11, while HDPE has the least resistance. These research findings can serve as valuable reference data for evaluating the hydrogen permeability of liner materials.
作为全增强碳纤维复合储氢瓶常用的内衬材料，聚酰胺6（PA6）在使用过程中需要满足规定的氢气渗透指数；否则，可能会对储氢瓶的安全使用产生不利影响。测试了PA6在不同温度和压力下的氢气渗透率，并研究了其氢气渗透率的变化情况。此外，还测试了PA6、聚酰胺11（PA11）和高密度聚乙烯（HDPE）在温度为288 K、压力为70 MPa时的氢气渗透率，并研究了这些常用的IV型车载储氢瓶内衬材料之间氢气渗透率的差异。本文报道的结果表明，PA6的氢气渗透率和扩散系数均随测试温度的升高而增加，但随压力的增加而降低。PA6的溶解系数随测试温度和压力的变化无明显变化。在测试温度为288 K、压力为70 MPa时，三种材料中，PA6的抗氢气渗透能力略强于PA11，而HDPE的抗渗透能力最弱。这些研究结果可为评估内衬材料的氢气渗透率提供有价值的参考数据。
