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Swelling Kinetics Modeling of Cationic Methacrylamide-Based Hydrogels

Cationic hydrophilic hydrogels containing methacrylamide (as the basic monomer) were synthesized by the free radical polymerization. Methacrylamido propyl trimethyl ammonium chloride (MAPTAC) and N, N'- methylene-bis-acrylamide (Bis) were used as the cationic agent and the crosslinker, respectively. The effects of various concentrations of all monomers and the crosslinker density on the swelling behaviour were investigated. The diffusion coefficient was determined. The kinetic constant of diffusion and the swelling exponent were calculated. The irregular behaviour related to the non-Fickian anomalous which explains swelling mechanism was more observed when the crosslinker amounts increased. The diffusion coefficient of the solvent into the network decreased with increasing the crosslinker amounts and all monomers concentration. The experimental data were in good agreement with the modelled data (the error percentage was around 5%).