Search National Agricultural Library Digital Collections
Back to Search
NALDC Record Details:
Diffusion coefficients of water in biobased hydrogel polymer matrices by nuclear magnetic resonance imaging
Download [PDF File]
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.
Journal of applied polymer science 2012 Sept. 25, v. 125, no. S2
John Wiley & Sons
Journal Articles, USDA Authors, Peer-Reviewed
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.
Agricultural Research Service
Web Policies and Important Links