Abstract
Ethyl acrylate was included into pH sensitive hydrogels based on N-maleoyl–chitosan and poly(acrylic acid) in the aim to tailor the swelling capacity and to improve the hydrogels mechanical stability. Hydrogels morphology analysis indicates a macroporous structure with microdomains (hydrophilic/hydrophobic) that are spreading, while the uniformity is dependent on the content of ethyl acrylate. The hydrogels conserved the pH sensitivity in aqueous solutions; the ethyl acrylate reduced the swelling capacity and modified the absorption mechanism from anomalous to a Fickian one. Viscoelastic characteristics, investigated using oscillatory deformation tests, revealed the formation of chemical–physical crosslinked network; ethyl acrylate increased the mechanical stability of hydrogels.
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