Abstract
The swelling behavior of poly(acrylic acid) (PAA) gels in aqueous ethanol (EtOH) was investigated. These gels were prepared by γ-irradiation and pretreated in aqueous solutions of different pH levels in order to vary the charge density. With increasing pH of the pretreating solutions, a distinct collapse was observed for a PAANa gel in 40–60 vol.-% EtOH. This effect was less pronounced in the presence of 0.1 M NaCl. Moreover, the deswelling regions were dependent on the counterion species of the used salt solutions, i. e. NaCl or CsCl.
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