Rheology of self-assembled highly viscoelastic network based on wormlike surfactant micelles with movable hydrophobic junctions

Viscoelastic properties of solutions of entangled wormlike micelles of anionic surfactant potassium oleate were investigated in the presence of hydrophobically modified polyacrylamide (HM PAAm) at different compositions. It has been shown that HM PAAm increases the plateau storage modulus and the ze...

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Bibliographic Details
Main Authors: Molchanov, V. S., Pletneva, V. A., Philippova, O. E.
Format: Conference Proceeding
Language:English
Subjects:
Crosslinking
Hydrophobicity
Micelles
Polyacrylamide
Polymers
Rheological properties
Rheology
Self-assembly
Shear viscosity
Storage modulus
Surfactants
Viscoelasticity
Viscosity
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Summary:Viscoelastic properties of solutions of entangled wormlike micelles of anionic surfactant potassium oleate were investigated in the presence of hydrophobically modified polyacrylamide (HM PAAm) at different compositions. It has been shown that HM PAAm increases the plateau storage modulus and the zero-shear viscosity by several orders of magnitude because of physical crosslinking of the micellar chains as a result of penetration of hydrophobic side groups of the polymer into the micelles. The observed direct influence of a number of hydrophobic groups of polymer on the rheological properties confirms the polymer-surfactant interaction. The effect of polymer decreases with increasing surfactant concentration, when branched wormlike micelles are formed instead of linear ones. The increase of the plateau storage modulus and the zero-shear viscosity with addition of HM PAAm were observed both below and above the overlap concentration of polymeric chains. In the last case, the hydrophobic side groups of the polymer can form domains reinforcing the polymer-surfactant network.
ISSN:0094-243X
1551-7616
DOI:10.1063/5.0163103