Rheology and binding studies in aqueous systems of hydrophobically modified acrylamide and acrylic acid copolymers and surfactants

  • Li Y
  • Kwak J
  • 5

    Readers

    Mendeley users who have this article in their library.
  • 33

    Citations

    Citations of this article.

Abstract

Viscosity data are reported for aqueous solutions of a series of acrylamide-based co- and terpolymers with added surfactants. Polymer composition is systematically varied through ionic content (acrylic acid monomer content and solution pH) and hydrophobicity (alkylacrylamide content and alkyl chainlength). Surfactants used were sodium dodecylsulfate (SDS), diethylhexyl sulfosuccinate (AOT), dodecyltrimethyl ammoniumbromide (DTAB) and nonionic surfactants. For the anionic surfactant SDS, a surfactant selective electrode was used to obtain binding isotherms of SDS with the polymers. The experiments show that in the presence of anionic surfactants, the solutions exhibit a dramatic increase in solution viscosity at concentrations around the surfactant CMC, attributed to interpolymer cross-linking through the formation of mixed micelles involving the hydrophobes from different polymer chains and the surfactant molecules. The viscosity enhancement is found to increase with increasing hydrophobicity of the hydrophobe and decreases with increasing AA incorporation in the polymer. The ionic fraction of the polymer chain (AA) also plays an important role in unfolding the polymer chain through electrostatic repulsion contributing to the viscosity increases at high solution pH. Both rheology and EMF-derived binding isotherms suggest that the viscosity maximum occurs at a low ratio of bound surfactant and hydrophobe monomers of approximately two surfactant molecules per hydrophobe. © 2003 Elsevier B.V. All rights reserved.

Author-supplied keywords

  • Associative-polymers
  • Hydrophobically modified polymers
  • Polyacrylamide
  • Rheology
  • Surfactant-binding

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

Authors

  • Yan Li

  • Jan C.T. Kwak

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free