Linear Hygrothermal Viscoelastic Characterization of Nafion NRE 211 Proton Exchange Membrane

The tensile relaxation modulus of a commercially available proton exchange membrane, Nafion® NRE 211, was obtained over a range of humidity levels and temperatures using a commercial dynamic mechanical analyzer (DMA). Hygral stress relaxation master curves were first constructed, followed by a hygro...

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Bibliographic Details
Published in:Fuel cells (Weinheim an der Bergstrasse, Germany) Germany), 2012-10, Vol.12 (5), p.787-799
Main Authors: Patankar, K. A., Dillard, D. A., Case, S. W., Ellis, M. W., Lai, Y.-H., Gittleman, C. S.
Format: Article
Language:English
Subjects:
Doubly Shifted Master Curve
Dry-Humid Transition
Fuel cells
Hygrothermal Stresses
Materials creep
Mechanical Durability
Membranes
Nafion NRE 211
Physical Aging
Proton Exchange Membranes
Protons
Tensile strength
Time Temperature Moisture Superposition Principle
Viscoelastic characterization
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Summary:The tensile relaxation modulus of a commercially available proton exchange membrane, Nafion® NRE 211, was obtained over a range of humidity levels and temperatures using a commercial dynamic mechanical analyzer (DMA). Hygral stress relaxation master curves were first constructed, followed by a hygrothermal master curve using the time temperature moisture superposition principle. The hygrothermal master curve was fitted using a 10‐term Prony series and validated using longer term stress relaxation tests. To validate the results from the stress relaxation experiments, short and long‐term creep compliance was converted into stress relaxation modulus using a well‐known viscoelastic conversion formula, and compared with the relaxation modulus obtained under identical conditions. Good agreement was found between the two datasets. It was evident that relaxation data at 2% RH at the test temperatures was not superposable with the master curves obtained at higher relative humidity (10% 
ISSN:1615-6846
1615-6854
DOI:10.1002/fuce.201100134