Conformations of sodium poly(styrene-4-sulfonate) macromolecules in solutions with different ionic strengths

Gubarev, A. S.; Гаврилова, И. И.; Panarin, E. F.

doi:10.1134/s0965545x11110095

Cited by 14 publications

(12 citation statements)

References 25 publications

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“…Nevertheless, the DLS method is widely used for determination of diffusion coefficients of NaPSS in water [29][30][31][32]. So, we consider that comparison of the size distributions by intensity, volume, and number, at the different conditions is reasonable.…”

Section: Dls Measurementsmentioning

confidence: 99%

Influence of the Ionic and Non-Ionic Additives on the Acid Strength of Neutral Red in the Aqueous Solutions of Poly (Sodium 4-Styrenesulfonate)

Moskaeva¹

2017

Chemical

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Polyions of poly (sodium 4-styrenesulfonate) in aqueous solution may be considered as colloidal pseudophase. Analogously to micelles, some species can be bind by the charged polyelectrolyte coils. In this paper, the colored acid-base indicator dyes were used for studying the penetration of ionic and non-ionic solution components in polyelectrolyte coils. Such analysis relies on alteration of the acid strength of dyes. The aim of this work was to determine the dependences of the apparent ionization constants of neutral red, app a K , on the ionic strength of solution, I, in different mixed systems containing poly (sodium 4-styrenesulfonate) (NaPSS) and tetraethylammonium bromide, tetra-n-butylammonium iodide, or 1-butanol with NaCl. Neutral red is fixed in the polyelectrolyte coils due to electrostatic and hydrophobic interactions. The polyelectrolyte : dye concentration ratio, P : D, an important parameter for spectophotometrical measurements, equals 100. It was found that tetra-n-alkylammonium salts display a stronger influence on the acid strength of neutral red as compared with that of NaCl. For instance, in the case of tetraethylammonium bromide app a pK = 7.90 ± 0.07 at I = 0.02 M whereas app a pK = 8.45 ± 0.04 with NaCl at the same ionic strength. It can be explained by specifical adsorption tetra-n-alkylammonium cations on polyions 'surface'. Introduction of 1-butanol significantly increases the acid strength of neutral red too, however its influence isn't monotonic with change of ionic strength. The dependences of app a pK on log I were discussed in terms of regularities which are well-known for surfactant micellar systems. All mentioned systems were also examined by dynamic light scattering measurements using Zetasizer Nano ZS Malvern Instruments apparatus. As it turned out, when the ionic strength is 3×10 -3 М or more the size (by number) of polyions in the presence of NaCl is of about 7 nm. Introduction of the additives results in somewhat higher size: in the case of 1-butanol the size of NaPSS is 10 nm.

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Section: Dls Measurementsmentioning

confidence: 99%

Influence of the Ionic and Non-Ionic Additives on the Acid Strength of Neutral Red in the Aqueous Solutions of Poly (Sodium 4-Styrenesulfonate)

Moskaeva¹

2017

Chemical

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“…It was also shown on the basis of static and dynamic light scattering and viscosity measurements [26,27] at different concentrations that the increase of ionic strengths of solutions of sodium poly(-styrene-4-sulfonate) changes the conformations of their macromolecules from rigid rods to coils and, then, approach a globular conformation.…”

Section: Ionic Condensation Effectmentioning

confidence: 99%

New interpretation of the dependence of the conductibility of PSS and PAA polyions with the nature of the counterions

2015

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The main object of this paper is to give a new interpretation of the dependence of the conductibility of a polyion with the nature of its counterions. For this, we analyzed in detail while comparing several models, the various physical factors influencing the mobility of a polyion (ionic condensation, hydrodynamic and electrophoretic frictions, ionic relaxation effect, and dielectric friction), and also their correlation with the ionic force and the conformation of the polyion. We showed that the specificity of the counterions appears in the hydrodynamic and electrophoretic effects via their effective radii, as in the dielectric friction effect, because of the influence of the condensed ions on the local permittivity around polyions.

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“…The noncharged analogue of the MVAA–MVAHCl copolymer is water-soluble poly( N -methyl- N -vinylacetamide) (PMVAA), while hydrophobic polystyrene is the noncharged analogue of PSSNa. The part of the previous experimental results was published earlier. − …”

Section: Introductionmentioning

confidence: 99%

Strong Linear Polyelectrolytes in Solutions of Extreme Concentrations of One–One Valent Salt. Hydrodynamic Study

et al. 2014

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Two series of highly charged linear aliphatic polymerssodium polystyrene-4-sulfonate and random copolymer of N-methyl-N-vinylacetamide and N-methyl-N-vinylamine hydrochloridewere studied in water solution without added salts and in solutions containing up to 5 M NaCl. Intrinsic viscosity in salt-free solutions was estimated by a method proposed earlier [Pavlov et al. Russ. J. Appl. Chem. 2006, 79, 1407−1412. Molecular characteristics were obtained in 0.2 M NaCl. The polyelectrolytes were studied in more than 10-fold range of molar mass. Qualitatively, the conformational status of the polyelectrolyte chains in different ionic strength was defined with the Kuhn−Mark−Houwink−Sakurada plots normalized by the value of linear chain density. In salt-free solution both polyelectrolytes could be attributed to extra rigid chains with the statistical segment length of 650 nm for sodium polystyrene-4-sulfonate and 100 nm for copolymer chains. Such statistical segment lengths are provided by short-range electrostatic intrachain interactions and are comparable with the Debye screening length. At extremely high NaCl concentration polyelectrolyte chains became discriminated by their degree of hydrophobicity. Chains of hydrophobic nature are compacted up to preglobular state, whereas the chains of the hydrophilic nature stay in the conformation of swelling coils at the highest concentration of NaCl.

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Conformations of sodium poly(styrene-4-sulfonate) macromolecules in solutions with different ionic strengths

Cited by 14 publications

References 25 publications

Influence of the Ionic and Non-Ionic Additives on the Acid Strength of Neutral Red in the Aqueous Solutions of Poly (Sodium 4-Styrenesulfonate)

Influence of the Ionic and Non-Ionic Additives on the Acid Strength of Neutral Red in the Aqueous Solutions of Poly (Sodium 4-Styrenesulfonate)

New interpretation of the dependence of the conductibility of PSS and PAA polyions with the nature of the counterions

Strong Linear Polyelectrolytes in Solutions of Extreme Concentrations of One–One Valent Salt. Hydrodynamic Study

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