Critical incorporation concentration of surfactants added to micellar solutions of hydrophobically modified polyelectrolytes of the same charge

Ralph H. Colby, Nopparat Plucktaveesak, Lev Bromberg

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

Polymer-surfactant interactions in aqueous solutions of the surface-active copolymer poly(ethylene oxide)-b-poly(propylene oxide)-b-poly(ethylene oxide)-g-poly(acrylic acid) and a homologous series of alkyl sulfates are studied. When surfactants of the same charge are added to copolymer solutions that already have micelles, the surfactant starts to incorporate into the existing polymer micelle at the critical incorporation concentration (CIC). Surface tension measurements determine the CIC as a local minimum in surface tension as a function of added surfactant. Fluorescence emission measurements using a selective fluorescent probe indicate that the surfactant incorporation is noncooperative. Because the initial incorporation at the CIC only involves a single surfactant entering a nonionic micelle, no counterion condensation is needed, making the tail-length dependence of the CIC similar to the tail-length dependence of the critical micelle concentration of nonionic surfactants.

Original languageEnglish (US)
Pages (from-to)2937-2941
Number of pages5
JournalLangmuir
Volume17
Issue number10
DOIs
StatePublished - May 15 2001

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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