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Preparation of a polyelectrolyte complex gel from chitosan and κ‐carrageenan and its pH‐sensitive swelling
Author(s) -
Sakiyama Takaharu,
Chu ChiaHong,
Fujii Tomoyuki,
Yano Toshimasa
Publication year - 1993
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1993.070501121
Subject(s) - swelling , polyelectrolyte , chitosan , aqueous solution , chemistry , carrageenan , polymer chemistry , chemical engineering , nuclear chemistry , materials science , chromatography , polymer , organic chemistry , composite material , biochemistry , engineering
A polyelectrolyte complex gel was prepared by mixing chitosan and k ‐carrageenan solutions in the presence of NaCl. To study the effect of ambient pH on the swelling behavior, the diameter of the cylindrical gel(4 mm x 8 mm) immersed in aqueous NaOH, KOH, or HCl solution was measured. In the range of pH 10–12, the diameter increased with time, and the gel reached swelling equilibrium within 6 days. In an NaOH solution of pH 10.5, the maximum swelling occurred, and the volume of the gel at equilibrium was 10.2 times as large as the initial one. At pH below 9 and at pH 13, no swelling was observed. Thus, the swelling of the complex gel prepared in this study was sensitive to a rather narrow range of pH. The swelling equilibrium in the presence of NaCl was also investigated at various pH. © 1993 John Wiley & Sons, Inc.