Creep and stress-rupture of Nafion (R) membranes under controlled environment

    Authors

    R. Solasi; X. Y. Huang;K. Reifsnider

    Comments

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    Abbreviated Journal Title

    Mech. Mater.

    Keywords

    Nafion (R); Creep; Stress-rupture; Time-dependent failure; Fuel cell; Time-temperature-hydration parameter; POLYMER ELECTROLYTE MEMBRANE; FUEL-CELL MEMBRANES; MECHANICAL-PROPERTIES; WATER-UPTAKE; TEMPERATURE; TRANSPORT; HYDRATION; HUMIDITY; IONOMERS; BEHAVIOR; Materials Science, Multidisciplinary; Mechanics

    Abstract

    Nafion(R) as a polymer shows time-dependent behavior including creep and relaxation. Application of this material in automotive fuel cells and targeted lifetimes require consideration of time-dependent failure of Nafion(R) in fuel cell design. In this work, creep tests for Nafion(R) were conducted in a controlled environment at different hydrations and temperatures. Stress-rupture curves for Nafion(R) were obtained for different hydrations (RH = 5%, 50% and 90%) at room temperature and also for two different temperatures (25 degrees C & 80 degrees C) at 50% relative humidity. Time-dependent failure was observed for all these conditions regardless of temperature and hydration level (state of water in Nafion(R)). Ionic forces created by cross linkings (by introducing water to membrane) do not seem to prevent disentanglements of the chains since there is no change in rate of time-dependent failure results. A time-hydration/temperature equivalence method (Sherby-Dorn) is suggested as a method to use short-term test data to estimate rupture times for other conditions. (C) 2010 Elsevier Ltd. All rights reserved.

    Journal Title

    Mechanics of Materials

    Volume

    42

    Issue/Number

    7

    Publication Date

    1-1-2010

    Document Type

    Article

    Language

    English

    First Page

    678

    Last Page

    685

    WOS Identifier

    WOS:000279595600002

    ISSN

    0167-6636

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