Semi-interpenetrating polymer networks (semi-IPNs), composed of chitosan and poly(hydroxy ethyl methacrylate) hydrogels, were prepared and the effects of various pH, temperatures, and an electric-field on the swollen hydrogels were investigated. The swelling kinetics increased rapidly, reaching equilibrium within 60 min. Semi-IPN hydrogels exhibited relatively high swelling ratios, 150-350%. The swelling ratio increased when the pH of the buffer was below pH 7 as a result of the dissociation of ionic bonds. Semi-IPN hydrogels showed electroresponsiveness by shrinking when an electric field was applied.
- Poly(hydroxyethyl methacrylate)
- Swelling behavior
- pH sensitive