Fig. 3.

A) SEM images of SMS hydrogel. B) Compression testing, C) Strain-Stress curve and D) Rheological behavior of SMS hydrogel and SMS hydrogel immersed in 0.1 mM Ca²⁺ for 24 h. E) pH changes of SMS hydrogel soaked in HCl solution (pH = 6.5). F) In vitro swelling and G) degradation of SMS hydrogel in PBS (pH = 7.4) and HCl solution (pH = 6.5). H) SEM images of SMS hydrogel residuals after immersion in PBS (pH = 7.4) and HCl solution (pH = 6.5) for 14 days and 28 days, respectively.