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Poly(allylamine) (PAlAm) gel was prepared by γ‐ray irradiation. Swelling behavior of the charged PAlAm gels having Cl− and NO3− counter‐ions (PAlAmHCl and PAlAmHNO3, respectively) was investigated in aqueous organic solvent mixtures as functions of solvent species (dimethylsulfoxide (DMSO), methanol (MeOH), ethanol (EtOH), 2‐propanol (2PrOH), tert‐butanol (tert‐BuOH), acetone, tetrahydrofuran (THF) and dioxane) and the concentration. With increasing solvent concentration, the gels (except for the DMSO system) showed a sharp deswelling comparable to the volume phase transition. The solvent specificity for the PAlAmHNO3 gel transition was correlated with the dielectric constant of the organic solvents, while that for the PAlAmHCl gel suggested that solvency for the counter anion is another important factor.
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Yasumoto et al. (2004) studied this question.
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