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Mechanical properties of the poly(AAm-co-MA/Rh) hydrogel. (a) Tensile stress–strain curves of poly(AAm-co-MA/Rh) hydrogels with a solid content of 50 wt%, (b) 60 wt%, (c) 70 wt%, and Rh-crosslinker concentrations of 0.3, 0.4, 0.5, and 0.6 mol% of methyl acrylate (MA), respectively. (d) Tensile stress–strain curves of poly(AAm-co-MA/Rh) hydrogels with a solid content of 50, 60, 70 wt% and the same Rh crosslinker concentration of 0.5 mol% of MA.
