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Diffusion coefficients of water in biobased hydrogel polymer matrices by nuclear magnetic resonance imaging
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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.
Doll, Kenneth M.
Vermillion, Karl E.
Fanta, George F.
magnetic resonance imaging
nuclear magnetic resonance spectroscopy
Journal of applied polymer science 2012 Sept. 25, v. 125, no. S2
Journal Articles, USDA Authors, Peer-Reviewed
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