Anomalous moisture diffusion in an epoxy adhesive detected by magnetic resonance imaging

Authors

  • Gabriel LaPlante,

    Corresponding author
    1. Department of Mechanical Engineering, Université de Moncton, Moncton, New Brunswick, Canada E1A 3E9
    • Department of Mechanical Engineering, Université de Moncton, Moncton, New Brunswick, Canada E1A 3E9
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  • Alexei V. Ouriadov,

    1. Imaging Research Laboratories, Robarts Research Institute, University of Western Ontario, P. O. Box 5015, London, Ontario, Canada N6A 5K8
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  • Pearl Lee-Sullivan,

    1. Department of Mechanical and Mechatronics Engineering, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, Canada N2L 3G1
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  • Bruce J. Balcom

    1. MRI Centre, Department of Physics, University of New Brunswick, P. O. Box 4400, Fredericton, New Brunswick, Canada E3B 5A3
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Abstract

Non-Fickian or anomalous diffusion is frequently observed when the absorption of moisture by a polymer is being studied. Different models have been presented in the literature that can accurately predict the trends of the weight-gain curves. However, it is not always clear which of these models yield good predictions of moisture distribution. This article presents a time-resolved moisture distribution study of an epoxy sample immersed in deuterated water (D2O) at 70°C over a period of 2.5 months. The moisture distribution was measured during that period with a novel high-resolution magnetic resonance imaging technique that is well adapted to the imaging of thin plates. The experimental results showed that the concentration of D2O at the surface of the sample increased with time, even after 2.5 months. These results were used to evaluate the performance of several standard diffusion models. Although this study is phenomenological, it appears that a model featuring time-varying boundary conditions yields the best representation of moisture absorption for these samples. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008

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