Xia Re, Zhou Hongjian, Wu Runni, Wu Wen-Ping
School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China.
Department of Engineering mechanics, School of Civil Engineering, Wuhan University, Wuhan 430072, China.
Polymers (Basel). 2016 Sep 20;8(9):344. doi: 10.3390/polym8090344.
Operating temperature can be a limiting factor in reliable applications of Proton Exchange Membrane (PEM) fuel cells. Nanoindentation tests were performed on perfluorosulfonic acid (PFSA) membranes (Nafion 117) in order to study the influence of the temperature condition on their mechanical properties. The hardness and reduced modulus of Nafion 117 were measured within a certain temperature range, from 10 to 70 °C. The results indicate that both hardness and elastic modulus show non-monotonic transition with the increase of the test temperature, with reaching peak values of 0.143 and 0.833 GPa at 45 °C. It also found that the membranes have a shape memory effect and a temperature dependent shape recovery ratio.
工作温度可能是质子交换膜（PEM）燃料电池可靠应用中的一个限制因素。为了研究温度条件对全氟磺酸（PFSA）膜（Nafion 117）机械性能的影响，对其进行了纳米压痕测试。在10至70°C的特定温度范围内测量了Nafion 117的硬度和折合模量。结果表明，硬度和弹性模量均随测试温度的升高呈现非单调转变，在45°C时分别达到峰值0.143 GPa和0.833 GPa。还发现这些膜具有形状记忆效应和与温度相关的形状恢复率。
