Adsorption of poly(ethylene oxide) at the air/water interface: A dynamic and static surface tension study

T. Gilányi, Imre Varga, Magdolna Gilányi, R. Mészáros

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

The adsorption of polyethylene oxide (PEO) homologues in a wide range of molecular weight (from MPEO = 200 to 106) at the air/aqueous solution interface was investigated by dynamic and static surface tension measurements. An approximate estimate for the lower limit of PEO concentration was given at which reliable equilibrium surface tension can be determined from static surface tension measurements. It was shown that the observed jump in the earlier published σ - lg (cPEO) curves is attributable to the nonequilibrium surface tension values at low PEO concentrations. The adsorption behavior of short chain PEO molecules (MPEO ≤ 1000) is similar to that of the ordinary surfactants. The estimated standard free energy of PEO adsorption, Δ G0, increases linearly with the PEO molecular weight until MPEO = 1000. In this molecular weight range, Δ G0 was found to be approximately the fifth of the hydrophobic driving force related to the adsorption of a surfactant with the same number of methylene groups. In the case of the longer chain PEOs the driving force of adsorption is so high that the adsorption isotherm is near saturation in the experimentally available polymer concentration range. Above a critical molecular weight the PEO adsorption reveals universal features, e.g., the surface tension and the surface density of segments do not depend on the polymer molecular weight.

Original languageEnglish
Pages (from-to)428-435
Number of pages8
JournalJournal of Colloid and Interface Science
Volume301
Issue number2
DOIs
Publication statusPublished - Sep 15 2006

Fingerprint

ethylene oxide
Polyethylene oxides
Surface tension
polyethylenes
interfacial tension
Adsorption
molecular weight
adsorption
oxides
Water
air
Molecular weight
Air
water
Surface-Active Agents
Polymers
surfactants
Surface active agents
polymers
Adsorption isotherms

Keywords

  • Adsorption driving force
  • Equilibration criteria
  • Fluid/fluid interface
  • Macromolecule
  • Polymer adsorption
  • Surface tension

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry
  • Surfaces and Interfaces

Cite this

Adsorption of poly(ethylene oxide) at the air/water interface : A dynamic and static surface tension study. / Gilányi, T.; Varga, Imre; Gilányi, Magdolna; Mészáros, R.

In: Journal of Colloid and Interface Science, Vol. 301, No. 2, 15.09.2006, p. 428-435.

Research output: Contribution to journalArticle

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