Polymer-surfactant interactions: Binding mechanism of sodium dodecyl sulfate to poly(diallyldimethylammonium chloride)

Gilat Nizri, Serge Lagerge, Alexander Kamyshny, Dan T. Major, Shlomo Magdassi*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

103 Scopus citations

Abstract

The binding mechanism of poly(diallyldimethylammonium chloride), PDAC, and sodium dodecyl sulfate, SDS, has been comprehensively studied by combining binding isotherms data with microcalorimetry, zeta potential, and conductivity measurements, as well as ab initio quantum mechanical calculations. The obtained results demonstrate that surfactant-polymer interaction is governed by both electrostatic and hydrophobic interactions, and is cooperative in the presence of salt. This binding results in the formation of nanoparticles, which are positively or negatively charged depending on the molar ratio of surfactant to PDAC monomeric units. From microcalorimetry data it was concluded that the exothermic character of the interaction diminishes with the increase in the surfactant/polymer ratio as well as with an increase in electrolyte concentration.

Original languageAmerican English
Pages (from-to)74-81
Number of pages8
JournalJournal of Colloid and Interface Science
Volume320
Issue number1
DOIs
StatePublished - 1 Apr 2008

Bibliographical note

Funding Information:
This project was supported by the European Community Sixth Framework Program through the NACBO Consortium, Contract No.500804-2, and by the MAGNET program (project NFM) of the Israel ministry of industry.

Keywords

  • Binding isotherms
  • Cooperative binding
  • Microcalorimetry
  • Molar conductivity
  • Polyelectrolyte-surfactant interaction

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