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Diffusion coefficients of water in biobased hydrogel polymer matrices by nuclear magnetic resonance imaging

Authors

  • Kenneth M. Doll,

    Corresponding author
    1. Bio-Oils Research, Unit, U.S. Department of Agriculture/National Center for Agricultural Utilization Research/Agricultural Research Service, 1815 North University Street, Peoria, Illinois 61604
    • Bio-Oils Research, Unit, U.S. Department of Agriculture/National Center for Agricultural Utilization Research/Agricultural Research Service, 1815 North University Street, Peoria, Illinois 61604
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  • Karl E. Vermillion,

    1. Functional Foods Research Unit, U.S. Department of Agriculture/NCAUR/Agricultural Research Service, 1815 North University Street, Peoria, Illinois 61604
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  • George F. Fanta,

    1. Plant Polymer Research Unit, U.S. Department of Agriculture/NCAUR/Agricultural Research Service, 1815 North University Street, Peoria, Illinois 61604
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  • Zengshe Liu

    1. Bio-Oils Research, Unit, U.S. Department of Agriculture/National Center for Agricultural Utilization Research/Agricultural Research Service, 1815 North University Street, Peoria, Illinois 61604
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  • This article is a US Government work and, as such, is in the public domain in the United State of America.

  • Any mention of trade names or commercial products in this publication is solely for the purpose of providing specific information and does not imply recommendation or endorsement by the U.S. Department of Agriculture. The U.S. Department of Agriculture is an equal opportunity provider and employer.

Abstract

The diffusion coefficients of water in biobased hydrogels were measured with a simple NMR method. This method tracked the migration of deuterium oxide through imaging data that was fit to a diffusion equation. The results show that a 5 wt % soybean-oil-based hydrogel gave an aqueous diffusion of 1.37 (±0.21) × 10−9 m2/s. The value for a 0.5 wt % saponified starch–polyacrylonitrile graft copolymer was 1.28 (±0.26) × 10−9 m2/s, which remained about the same at increased polymer content in the hydrogel. For comparison, a commercially available acrylic polymer was evaluated with the same methodology and was found to have a diffusion coefficient of 7.6 (±1.3) × 10−10 m2/s, about half that of the biobased products studied here. These parameters are of significant interest in the development of controlled release applications. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2012

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