The rheological features of concentrated polyelectrolyte solutions

Myasnikov, B.V.; Trapeznikov, A.A.; Ryabov, A.V.; Yemel'yanov, D.N.

doi:10.1016/0032-3950(71)90302-9

Cited by 3 publications

(2 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An initial peak followed by a flat region and a final increase can be observed in Figure 4. Myasnikov et al (20) observed an initial peak in the flow curves of polymethacrylic acid (M w = 2.0 × 10 5 g/mol) concentrated solutions. The peak, not observed for polyacrylic acid solutions, was attributed to the cooperative effect of hydrophobic interactions between methyl functional groups.…”

Section: Resultsmentioning

confidence: 98%

Solvent-dependent rheological behavior of concentrated solutions of a cationic acrylic terpolymer containing self-assembled chains

2015

View full text Add to dashboard Cite

It has been proved that alcohol molecules exist as cyclic and chain aggregates of different sizes in pure or mixed solvent systems. Here, it will be shown that these aggregates can radically change the rheological properties of a concentrated polymer solution containing self-assembled chains. In a previous study by the same authors, the existence of self-assembled structures in dilute solution of poly(dimethylaminoethyl methacrylate-co-methyl methacrylate-co-butyl methacrylate) in an alcoholic solvent mixture was shown according to small angle X-ray scattering results, showing that these structure were much more compact than those in acetone. This finding is based on the role of alcohol aggregates as physical cross-linkers. Here, the existence of self-assembled structures in concentrated solutions of the same terpolymer was confirmed by atomic force microscopy and rheology results both in acetone (a good solvent) and in a solvent mixture composed of acetone, ethanol and 1-propanol. For the terpolymer solutions in the solvent mixture, very little decrease in complex viscosity and shear thickening were observed at high strains and frequencies, respectively. It can be concluded that the alcohol aggregates can cause the formation of strong self-assembled structures that can even resist high shear forces or strains.

show abstract

Section: Resultsmentioning

confidence: 98%

Solvent-dependent rheological behavior of concentrated solutions of a cationic acrylic terpolymer containing self-assembled chains

2015

View full text Add to dashboard Cite

show abstract

“…In this picture, Figure c makes perfect sense, as less salt is needed to form a gel at higher polyelectrolyte concentrations. Such gels have been studied for many years, based primarily on neutralized poly(methacrylic acid). ,− The interaction of the polymer with water also appears to play some role, as the less hydrophobic neutralized poly(acrylic acid) does not form such a gel . Like all associating polymers, the precise nature of the association is not yet clear but the consequences are very clear.…”

Section: Discussionmentioning

confidence: 99%

Rheological Properties of Concentrated Sodium Polystyrenesulfonate in Aqueous Salt Solutions

Gulati,

Han,

Colby

et al. 2024

Macromolecules

View full text Add to dashboard Cite

We study the conformational and flow properties of sodium polystyrenesulfonate in aqueous NaCl solutions in the high polymer, high added-salt region using rheology and small angle neutron scattering (SANS). For low salt concentrations, the specific viscosity decreases with added salt as expected. At very high salt, however, the specific viscosity is found to rapidly increase with increasing added-salt concentration (c s ). This indicates that addition of salt modifies the system in ways other than simply decreasing the electrostatic screening length. Beyond a critical shear stress of around 400 Pa, independent of molar mass, solutions display strong shear thickening reminiscent of shear-induced gelation. Scaling laws for the zero shear rate viscosity and critical shear rate with molar mass, polymer and added-salt concentration are established and compared to similar behavior observed for other systems. SANS experiments using the zero-average-contrast technique reveal that the chain size monotonically decreases with increasing added salt concentration, indicating that the increases in specific viscosity cannot be assigned to chain expansion. Our results indicate that NaPSS, usually thought to be a model polyelectrolyte system, displays complex and unexpected rheological behavior when both the polymer and added salt concentration approach the molar range, where the Debye screening length becomes smaller than the Bjerrum length.

show abstract

Effect of concentration of isobutylene solutions on complex structural transitions occurring during shear deformation

Trapeznikov¹,

Pylayeva²

1975

Polymer Science U.S.S.R.

View full text Add to dashboard Cite

The rheological features of concentrated polyelectrolyte solutions

Cited by 3 publications

References 6 publications

Solvent-dependent rheological behavior of concentrated solutions of a cationic acrylic terpolymer containing self-assembled chains

Solvent-dependent rheological behavior of concentrated solutions of a cationic acrylic terpolymer containing self-assembled chains

Rheological Properties of Concentrated Sodium Polystyrenesulfonate in Aqueous Salt Solutions

Effect of concentration of isobutylene solutions on complex structural transitions occurring during shear deformation

Contact Info

Product

Resources

About