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Studies on chitosan and poly(acrylic acid) interpolymer complex. I. Preparation, structure, pH‐sensitivity, and salt sensitivity of complex‐forming poly(acrylic acid): Chitosan semi‐interpenetrating polymer network
Author(s) -
Wang Hanfu,
Li Wenjun,
Lu Yuhua,
Wang Zhiliang
Publication year - 1997
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/(sici)1097-4628(19970822)65:8<1445::aid-app1>3.0.co;2-g
Subject(s) - polyelectrolyte , acrylic acid , swelling , interpenetrating polymer network , chitosan , ionic strength , polymer chemistry , ionic bonding , polymer , membrane , valence (chemistry) , materials science , chemical engineering , chemistry , aqueous solution , ion , composite material , copolymer , organic chemistry , biochemistry , engineering
A novel semi‐interpenetrating polymer network (semi‐IPN) membrane composed of crosslinked chitosan(cr‐CS) and poly(acrylic acid) (PAA) was prepared. Evidence from infrared spectra proved the formation of polyelectrolyte complex through electrostatic interaction between $NH^+_3$ groups from CS and COO − groups from PAA. The semi‐IPN membrane swelled at high pH and at low pH exhibited a typical pH‐sensitivity. Its swelling degrees in different salt solutions with the same ionic valence and equal ionic strength were on similar levels. Under certain ionic strength ( I = 1.5 mol/L), the degree of swelling increased with increased metal ionic valence. Furthermore, the elongation of the semi‐IPN membrane could vary reversibly by immersion into CaCl 2 solution and KCl solution alternately. Reasons for the chemomechanical behavior are discussed. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 65:1445–1450, 1997