The CA with DS 2.5 (20 g) was solubilized in 100 mL of dimethylformamide
(DMF) at room temperature under vigorous stirring in
mechanical stirrer at 300 rpm. The EDTAD was dissolved in DMF at
90 ◦C under strong stirring.After complete dissolution ofthe CAand
EDTAD, both were mixed with vigorous stirring and were added
to 4 mL of triethylamine. The sudden increase in viscosity of the
system showed the end of the reaction. The synthesized hydrogels
were transferred to a Petri dish and remained for 48 h to cure
in desiccators. The gel was milled in a mixer in aqueous medium,
filtered and dried in an oven at 75 ◦C up to constant weight. The
preparation of hydrogels from CA was performed in homogeneous