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Effect of maleic acid content on network structure and swelling properties of poly( N ‐isopropylacrylamide‐ co ‐maleic acid) polyelectrolyte hydrogels
Author(s) -
Çaykara Tuncer
Publication year - 2004
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.20032
Subject(s) - swelling , polyelectrolyte , comonomer , self healing hydrogels , polymer chemistry , maleic acid , poly(n isopropylacrylamide) , polymerization , aqueous solution , diffusion , chemical engineering , absorption of water , solvent , materials science , polymer , chemistry , copolymer , organic chemistry , composite material , thermodynamics , physics , engineering
Hydrogels were prepared by γ‐ray–induced polymerization in aqueous solution of N ‐isopropylacrylamide (NIPA) and of NIPA with three different charge densities, that is, maleic acid (MA) as a comonomer. The swelling behaviors of these hydrogels were analyzed in buffer solutions at various pH and temperature ranges. The equilibrium swelling ratios were relatively high and sensitive to pH and temperature. The polymer–solvent interaction parameter (χ) and the molecular weight between crosslinks ( M c ) of P(NIPA/MA) polyelectrolyte hydrogels were calculated from swelling studies in buffer solutions at various pH values and related to MA content. A kinetic study of the absorption determined the transport mechanism as a non‐Fickian type diffusion. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 763–769, 2004