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Interaction of non‐ionic hydrogels with weak aromatic acids
Author(s) -
László Krisztina,
Kosik Katalin,
Filipcsei Genovéva,
Zrínyi Miklós
Publication year - 2003
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200351018
Subject(s) - phenol , resorcinol , chemistry , aqueous solution , solubility , titration , solvent , solvation , self healing hydrogels , weak base , swelling , ionic bonding , chromatography , ion , inorganic chemistry , polymer chemistry , chemical engineering , organic chemistry , engineering
Abstract Measurements are reported of the swelling behaviour at 20°C of poly (N isopropylacrylamide) (PNIPA) gels in aqueous solutions of two weak aromatic acids, phenol and resorcinol. For solute concentrations below 45 mmol/l the uptake of these solutions is similar. Due to selective solvation phenol exhibits an excess equilibrium concentration inside the gel of 5% over that in the surrounding bath, while for resorcinol, the excess is found to be 12%. At 50 mmol/l solute concentration, both systems display a volume transition accompanied by expulsion of the solvent. The solubility limits in water of these aromatic compounds, which are significantly different from each other (870 mmol/l and 9080 mmol/l respectively), are far above this critical concentration. In the collapsed condition the expelled liquid spreads on the surface of the phenol treated gel, while an ordered arrangement of separate droplets is generated in the case of resorcinol. In the latter case an acute contact angle was observed. It is also shown by acid‐base titration that the PNIPA/water system may exhibit a slight ion exchanging character.