Fig. 2.

Physical and mechanical characterization of DBAH. (a) Synthesis of DBAH with different ratio of (CS-MA 3)/DA (wt.%). (b) Hydrogel formation of DBAH with different (CS-MA)/DA (wt. %) (DBAH1: (CS-MA)/DA = 24%, DBAH2: (CS-MA)/DA = 12%, DBAH3: (CS-MA)/DA = 6%, DBAH4: (CS-MA)/DA = 3%). Suitable (CS-MA)/DA (wt. %) ((CS-MA)/DA ≥ 3 wt%) resulted in solid hydrogels. Lower CS-MA contents ((CS-MA)/DA = 1.5 wt%) resulted in viscous solution; (c) Gelation time of different hydrogels; (d) Purification of hydrogels with a three cycles of deionized water and ethanol. (e) Morphologies, (f) Swelling ratio, and (g), (h) Rheological analysis of DBAH.