The viscosity of polymer–surfactant mixtures in water

Abstract

The viscosity of aqueous solutions of poly(ethyleneoxide) (PEO) in the dilute and semidilute regimes exhibits a maximum as a function of sodium dodecyl sulfate (SDS) concentration. The maximum is shown to correspond to the point at which the polymer coils are saturated with surfactant. From intrinsic viscosity and small angle neutron scattering (SANS), we obtain a value of 0.65 for the excluded volume exponent of PEO at saturation. Carbon-13 nuclear magnetic resonance (NMR) relaxation measurements indicate that the correlation time for local segmental motion for polymer segments attached to micelles is reduced from about 10−11 to 10−9 s. However, only a relatively small fraction of the total coil is in direct contact with the micelles at saturation. A model for the polymer–surfactant complex is presented based on these considerations.

Interactions between Poly(ethylene Oxide) and Sodium Dodecyl Sulfate in Elongational Flows

“…1 does not have to coincide exactly with the maximum of the viscosity curve. However, Chari et al (9) maintain based on additional evidence, that the maximum corresponds to the PSP.…”

“…1, along with observed variations in the shear viscosity of a PEO solution as SDS is added (9). The model proposed is based upon the notion that the electronegative nature of the PEO chain allows it to coordinate with the surfactant's counterion (Na + ) to form a "pseudopolycation" in which positive charges are distributed along the polymer coil (11,12,17).…”

“…The nature of these interactions has been the subject of investigation for several decades (1). In particular, the interactions between poly(ethylene oxide) (PEO) and sodium dodecyl sulfate (SDS) in aqueous solutions have been extensively explored using techniques like surface tension (2, 3), nuclear magnetic resonance (NMR) (2,(4)(5)(6)(7)(8), small-angle neutron scattering (SANS) (1,4,9), light scattering (10)(11)(12), conductimetry (3,13,14), and shear viscometry (9,13,15,16), among others. It is widely recognized that these interactions involve the formation of PEO/SDS complexes in which micellar aggregates attach to the PEO chain.…”

An NMR study of macromolecular aggregation in a model polymer-surfactant solution

“…[11][12][13][14][15][16][17][18][19] We summarize below, briefly, what is known via a variety of techniques 11,12,[14][15][16][17][18][19][20][21][22] including NMR relaxometry 11,23,24 and diffusometry. 10,12,18,19,25 1.…”

Waterflooding of Surfactant and Polymer Solutions in a Porous Media Micromodel

“…The fluorescent dye solution was prepared as previously described, and a surfactant or polymer with a concentration of 0.1 wt % was added to this solution. Based on the interpolation of published data, the viscosities of our solutions were approximately 0.99 mPa·s for SDS in water [49] and 0.9 mPa·s for PVP in water [50]. Our injection flow rate was slow, and each experiment took only approximately 30 min to complete, during which time we did not observe PDMS swelling.…”