Shear and extensional rheology of solutions of mixtures of poly(ethylene oxide) and anionic surfactants in ionic environments

Dynamics and extensional rheology of polymer–surfactant association complexes

“…However, the PSP values depend on polymer concentration, in agreement with the previous reports on P 0 S À systems including PEO-SDS, PEO-SBDS, and PVP-SDS. 61,91 The changes in surface tension and steady shear viscosity are influenced by the surfactant-like and the polymerlike behavior of the polymer-surfactant complex, respectively. 25 Fig.…”

“…29,37,[49][50][51][52][53][54] Furthermore, most techniques are better suited for fluids with relatively high viscosity, and typically the range of accessible strain or strain rates is rather limited. 37,44,47,50,51,55 Table 1 summarizes the published datasets [56][57][58][59][60][61][62][63] on P 0 S À systems acquired with two commercially-available techniques: RFX opposed jet and CaBER (capillary breakup extensional rheometer). The measurements rely on a flexible, relatively high molecular weight (M w ) polymer, and the few data points included show that the critical extensional rate, _ e c for the onset of strain hardening, decreases on surfactant addition.…”

Novel application of PEG/SDS interaction as a wettability modifier of hydrophobic carbonate surfaces

“…0.01 and 0.1 mol/L, were selected, and the samples were aged for 72 h in PEG-20,000/SDS solutions at two different temperatures of 70°C and 22°C. These two levels of salinity were selected based on the previous findings in the literature (Torres et al 2008;Müller et al 2003). Müller et al (2003) have found that 0.1 mol/L is a relatively high concentration to observe the aggregation behaviour in the mixture of SDS/PEG.…”

New insights on the interaction between hydroxypropylmethyl cellulose and sodium dodecyl sulfate

“…Different explanations may be invoked to justify this observation. The most accepted one is that there is a chain contraction due to the intense intramolecular hydrophobic association junctions (Hoff et al, 2001;Samii, Karlstroem, & Lindman, 1991;Torres, Müller, Szidarovszky, & Sáez, 2008). The binding of surfactant molecules to semiflexible polymers such as EHEC or HPMC may modify the respective stiffness and this may, in turn, induce a coil-to-globule Fig.…”