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

Permanent URL:
http://handle.nal.usda.gov/10113/54248
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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.
Author(s):
Doll, Kenneth M. , Vermillion, Karl E. , Fanta, George F. , Liu, Zengshe
Subject(s):
biobased products , deuterium oxide , diffusivity , hydrocolloids , magnetic resonance imaging , nuclear magnetic resonance spectroscopy , polymers , soybean oil , water
Note:
Includes references
Source:
Journal of applied polymer science 2012 Sept. 25, v. 125, no. S2
Language:
English
Year:
2012
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
Rights:
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.