ePTFE含量对ePTFE/Nafion复合质子交换膜力学性能的影响及其增强阈值

Effects of porous ePTFE content on the mechanical property of ePTFE/Nafion composite proton exchange membrane and the reinforced threshold

摘要: 详细研究了ePTFE(expanded Poly-Tetra-Fluoro-Ethylene, 多孔聚四氟乙烯)增强相含量对复合质子交换膜力学性能的影响。结果表明, 增强相ePTFE体积分数对ePTFE/Nafion复合质子交换膜的物理增强存在一个阈值, 其理论数值约为20.7%。当ePTFE增强相含量低于该值时, 复合膜的断裂强度随ePTFE含量增加而减小; 当ePTFE增强相含量高于该值时, 复合膜的断裂强度随ePTFE含量增加而增大。ePTFE/Nafion复合质子交换膜的屈服强度随ePTFE含量的变化也表现出类似规律。

Abstract: The effect of content of porous ePTFE on the mechanical property of the ePTFE/Nafion composite proton exchange membrane was carefully investigated. The results show there is a PTFE content threshold value (ca. 20.7%, volume fraction) beyond which the composite membrane could be reinforced. The tensile strength of the composite membrane goes up with the increasing of ePTFE content when the ePTFE content is greater than the threshold value, and decreases with growing ePTFE content when the ePTFE content does not reach the threshold value. The yield strength change of the composite membranes with the ePTFE content shows similar trend.