Fig. 1
Characterization of the synthesized polymers and hydrogels. (A) 1 H NMR spectra of synthesized polymers. FTIR (B) and XPS spectra (C) of synthesized polymers and hydrogels. (D) SEM images of hydrogels. (E) Gelation times of hydrogels. (F) Rheological behaviors of hydrogels. (G) Stress–strain profiles of hydrogels by compression. (H) Swelling kinetics of hydrogels in PBS at pH 7.4 and 37 °C. (I) Degradation profiles of the hydrogels in PBS at pH 7.4 and 37 °C. Data are presented as the means ± SDs (n = 3)