Effect of Hygrothermal Ageing on PFSA Ionomers' Structure/Property Relationship
In this talk, the structure/property relationship of ionomers such as Nafion 212, 3M and Nafion XL will be examined both as received as well as after undergoing hygrothermal ageing at different conditions so as to correlate the separation-phased nanostructure with the membranes’ physical and transport properties. We will present the effect of pretreatment, temperature, humidity and purge flowrate on ageing and subsequent changes in mechanical, transport, uptake, and structural properties. It will be shown how the impact of ageing depends nonlinearly on humidity. We will also show how pretreatment like boiling and hot-pressing affect the impact of the ageing process. In addition, the possible effect of contamination will be discussed. Our findings provide new insight into how hygrothermal ageing affects the structure/property relationship of ionomers under different conditions.
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The authors would like to thank Kyle T. Clark for his help with using some of the diagnostics equipment. AK and AZW thank C.G. Gittleman of General Motors for insightful discussions. SAXS/WAXS experiments were performed in beamline 7.3.3 at the Advanced Light Source (ALS), Lawrence Berkeley National Laboratory, which is a national user facility funded by the Department of Energy, Office of Basic Energy Sciences. We thank Chenhui Zhu and Dr. Eric Schiable for their assistance during facilitating the use of equipment at ALS. Shouwen Shi greatly thanks China Scholarship Council (CSC) for financial support during his visit to Lawrence Berkeley National Laboratory. This work was funded by the Assistant Secretary for Energy Efficiency and Renewable Energy, Fuel Cell Technologies Office, of the U. S. Department of Energy under contract number DE-AC02-05CH11231 (LBNL) and program managers Donna Ho and Nancy Garland.