Determination of Oxygen Permeability in Acrylic-Based Hydrogels by Proton NMR Spectroscopy and Imaging

Polymer network membranes with a high capacity for water absorption are obtained by radical polymerization of N-[2-(2-hydroxyethoxy)ethyl]methacrylamide (HEEMAM). The permeability, solubility, and diffusion coefficients of oxygen in hydrogels are determined using nuclear magnetic resonance (NMR) methods based on the paramagnetic effect of dissolved oxygen gas on the proton spin-lattice relaxation times of water, and the results are compared with those obtained with electrochemical procedures. The results of NMR measurements of oxygen transport coefficients in distilled water show excellent agreement with corresponding literature values. The results of the potentiostatic and NMR oxygen transport measurements in hydrogels are in reasonable agreement and support the viability of the NMR methodThe authors gratefully acknowledge financial support provided by the Spanish Ministerio de Economia y Competitividad, projects MAT2011-29174-C02-02, FEDER MAT2011-22544, and FIS PI11/01436, and the Consejeria de Educacion-Junta de Castilla y Leon, project BU232U13.Compañ Moreno, V.; Mollá Romano, S.; Vallejos, S.; Garcia, F.; Miguel Garcia, J.; Guzman, J.; Garrido, L. (2014). Determination of Oxygen Permeability in Acrylic-Based Hydrogels by Proton NMR Spectroscopy and Imaging. Macromolecular Chemistry and Physics. 215(7):624-637. https://doi.org/10.1002/macp.201300730S6246372157Kazanskii, K. S., & Dubrovskii, S. A. (1992). Chemistry and physics of «agricultural» hydrogels. Advances in Polymer Science, 97-133. doi:10.1007/3-540-55109-3_3Tsuruta, T. (1996). Contemporary topics in polymeric materials for biomedical applications. 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