Swelling equilibria of cationic polyelectrolyte gels in aqueous solutions of various electrolytes

Shinichi Kudo, Mikio Konno, Shozaburo Saito

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)


Swelling experiments were carried out with three cationic polyelectrolyte gels of N-n-butyl-4-vinylpyridinium bromide (BPyBr), N-n-butyl-N,N-dimethyl-4-vinylanilinium bromide (BAnBr) and N-n-butyl-N,N-dimethyl-(N'-acryloyl-3-aminopropyl)ammonium bromide (BAPABr). The swelling equilibria of the gels were measured in aqueous solutions of inorganic electrolytes: HBr, NaBr, KBr, NaCl and NaI. The swelling ratios of the gels did not depend on the cationic species of the electrolytes examined but depended strongly on the anionic species. Volume phase transitions were not observed with the BPyBr and BAnBr gels in aqueous solutions of NaCl and NaBr whereas a phase transition was observed in an aqueous solution of NaI. The NaI concentration at which the phase transition occurred was raised with an increase in temperature. On the other hand, no discontinuous change was observed in the swelling equilibria of the BAPABr gel, even in the NaI aqueous solution. Comparison of the present results for the BAPABr gel with previous results for a polyelectrolyte gel verified the importance of hydrophobic interactions, which enhance the occurrence of volume phase transitions.

Original languageEnglish
Pages (from-to)2370-2373
Number of pages4
Issue number11
Publication statusPublished - 1993


  • aqueous electrolyte solution
  • cationic polyelectrolyte gel
  • hydrophobic interaction
  • volume phase transition

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry


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