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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Variation of swelling ratio of P(AAc-co-Am)/PVA double network hydrogels as function of time at 37 °C: (a) hydrogels with various Am/AAc ratios; (b) hydrogels with various Fe3+ concentrations.