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(A) Equilibrium swelling ratio of S4Q4, S4G4, S1Q4G4, S2Q4G4, S3Q4G4, and S4Q4G4 hydrogels in PBS (pH 7.4) at 37°C. (B) The schematic illustration of swelling for hydrogel network. (C) Cross-sectional SEM images of freeze-dried S4Q4, S4G4, S1Q4G4, S2Q4G4, S3Q4G4, and S4Q4G4 hydrogels. PBS, phosphate-buffered saline; SEM, scanning electron microscopy.
