Interaction of non-ionic hydrogels with small aromatic molecules

Katalin Kosik, Erik Geissler, Miklós Zrínyi, Krisztina László

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Measurements are reported on 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. 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 are significantly different (870 and 9080 mmol|l, respectively), and 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.

Original languageEnglish
Pages (from-to)771-775
Number of pages5
JournalPolymers for Advanced Technologies
Volume14
Issue number11-12
DOIs
Publication statusPublished - Jan 1 2003

Keywords

  • Collapse transition
  • Elastic modulus
  • Gel swelling
  • NIPA
  • Phenol
  • Resorcinol

ASJC Scopus subject areas

  • Polymers and Plastics

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