Volume-phase transitions of cationic polyelectrolyte gels
1992; Elsevier BV; Volume: 33; Issue: 23 Linguagem: Inglês
10.1016/0032-3861(92)90055-2
ISSN1873-2291
AutoresShinichi Kudo, Norio Kosaka, Mikio Konno, Shozaburo Saito,
Tópico(s)Hydrogels: synthesis, properties, applications
ResumoThe swelling equilibrium behaviour of N-n-butyl-N,N-dimethyl-4-vinyl benzylammonium bromide (BBABr) gel was measured in aqueous solutions of various inorganic electrolytes: HBr, LiBr, NaBr, KBr, NH4Br, NaCl, NaI and NaClO4. The equilibrium swelling volume of BBABr gel does not depend strongly on the cationic species but on the anionic species. In aqueous solutions containing I− and ClO−4 ions, the volume-phase transitions of the BBABr gel were induced by a change in the concentration of the electrolytes. It was verified experimentally with 79Br n.m.r. and an ion electrode that the volume-phase transition is controlled by the change in the association state of the charged groups in the gel.
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