Mechanical properties of proton ezchange membrane at different strain rates and temperatures

摘要：

Proton exchange membrane (PEM) is an important part of proton exchange membrane fuel cells (PEMFCs).The evaluations of PEM are mainly focused on the conductivity and methanol diffusion resistance.There are few studies on mechanical properties and reliability of PEM.In this study,the stress-strain behavior,creep-recovery behavior and stress-relaxation behavior of PEM at different strain rates and temperatures have been obtained on Dynamic Mechanical Analyzer.Strain controlled tensile tests were conducted at different strain rates of 0.1％/s,1％/s and 8％/s and five different temperatures of-30℃,0℃,30℃,55℃ and 85℃.There are three phases in tensile stress-strain curves of membrane samples,i.e.linear elastic,nonlinear hardening,and linear hardening.Creep-recovery tests were conducted with the stress level of 2MPa,4MPa,6MPa and 8MPa,and with the temperature of 30℃,55℃ and 85℃.Creep strain increases rapidly as the stress increases.The phenomenon is more obvious at high temperature especially.Creep strain increases rapidly as the temperature increases at the same stress and creep time.Stress-relaxation curves at strain of 10％,50％,100％ and the environment temperature of 30℃,55℃,85℃ were conducted.The larger the initial strain,the higher the initial stress.The stress decreases rapidly at beginning,and then the change becomes more and more gentle.

关键词： Proton ezchange membrane(PEM) Fuel Cell Hydration Mechanical properties Nation membrane

作者: Zhenfeng Wang Dan Liu Xu Chen

作者单位: School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China

会议类型: 国际会议

会议名称: 国际断裂力学2009年会

会议地点: 成都

会议语种:英文

页码: 403-408

在线出版日期: 2009-10-16（万方平台首次上网日期，不代表论文的发表时间）