Effect of the nature of the solvent on the viscosity of dilute and concentrated solutions of polymers with various chain flexibilities

Tager, A.A.; Dreval, V.Ye.; Botvinnik, G. O.; Kenina, S.B.; Novitskaya, V.I.; Sidorova, L.K.; Usol'tseva, T.A.

doi:10.1016/0032-3950(72)90136-0

Cited by 20 publications

(7 citation statements)

References 19 publications

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“…Extreme dependences of η sp /C on the ratio of solvents in a binary mixture were also observed for other polymers, in particular, for a wide range of cellulose derivatives. 52 The found nonlinearity of the dependences is associated with the interaction of solvents with each other, selective adsorption of one of the components on the polymer chain, as well as structure formation in dilute solutions.…”

Section: Resultsmentioning

confidence: 99%

Associative Behavior of Lignosulphonates in Moderately Concentrated Water, Water–Salt, and Water–Alcoholic Media

Lugovitskaya

Kolmachikhina

2021

Biomacromolecules

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Industrial derivatives of lignin lignosulfonates are produced during sulfite delignification of wood. They are characterized by a wide molecular weight distribution, polyfunctionality, and lack of crystallinity. The presence of hydrophobic and hydrophilic domains in the lignosulfonate macromolecular system determines the amphiphilic and polyelectrolyte properties of this biopolymer. As a polyelectrolyte, lignosulfonates (LSs) show complex conformational and phase behavior, which can be controlled by a wide range of external factors (ionic strength, medium acidity, solvent polarity, etc.). Herein, we present the results of a study of the associative behavior of three lignosulfonate samples with different molecular weight distributions (Mw 9250−46 300) and structural and cationic (Na + , Ca 2+ ) composition. The effects of the concentration of LS (0.2−200.0 g/dm 3 ), temperature (293−353 K), ionic strength of the medium (KCl, 0.08−0.80 mol), and ethanol additives (0.6−73.0 vol %) on the bulk and surface properties of lignosulfonates have been revealed. It was assumed that the LS association in solutions is a consequence of the processes of counterionic condensation with the formation of ionic pairs and multiplets. The binding of counterions is facilitated by an increase in the ionic strength of the medium and ethyl alcohol additives.

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Section: Resultsmentioning

confidence: 99%

Associative Behavior of Lignosulphonates in Moderately Concentrated Water, Water–Salt, and Water–Alcoholic Media

Lugovitskaya

Kolmachikhina

2021

Biomacromolecules

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“…Figure 4 presents 77/770 of 1.2 x 106-Da polyisobutylene in decalin, cyclohexane, CCI4, isooctane, and toluene at 25 °C, as measured by Tager et al [41][42][43] For this system, the behavior of 77/770 depends on the solvent. In decalin and cyclohexane, there is a solutionlike-meltlike transition near c[?7] 80 and 77/770 ~106, with meltlike behavior at larger [ ] and 77/770.…”

Section: Solutionlike-meltlike Transition For Linear Chainsmentioning

confidence: 97%

Hydrodynamic Scaling of Viscosity and Viscoelasticity of Polymer Solutions, Including Chain Architecture and Solvent Quality Effects

Phillies¹

1995

Macromolecules

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This paper examines the dependence of polymer solution viscosity and higher viscoelastic parameters (e.g., y" Je°) on polymer concentration, molecular weight, chain architecture, and solvent quality. For solutions of linear chains, a transition from a solutionlike (stretched-exponential) to meltlike (power-law) dependence of on c or M occurs at [ ] » 1, and sometimes [ ] > 100. The hydrodynamic scaling description of polymer transport coefficients remains applicable to concentrations far above the overlap concentration c[?;j «= 1. Star polymers remain in the solutionlike regime at c and M far above the c and M at which linear chains show a transition to meltlike behavior. Other viscoelastic parameters, notably yr and Je°, have the same c and M dependences (stretched exponential at lower (c, M), power law at larger (c, M)) that does, with the same solutionlike-meltlike transition concentration for all three parameters. If for a single polymer in a series of solvents is fit to exp(acv), the several-fold variation in a at fixed M is almost entirely accounted for by the dependence of a on solvent quality, as expressed by the chain expansion parameter a,. Experiment is consistent with the a ~a,3 here shown to be predicted by the hydrodynamic scaling model (Phillies, G.

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“…Depending on the type of interaction between the polymer and the solvent molecules, a polymer may dissolve fully or phase separate. Also, the addition of another solvent in a polymer solution can greatly enhance or reduce the polymer miscibility. , The effect of the solvent nature on the viscosity of a polymer solution is important in the practical aspects of processing and synthesizing polymers . Over the past few years, ionic liquids, ILs, have been considered as green and designer solvents.…”

Section: Introductionmentioning

confidence: 99%

“…1,2 The effect of the solvent nature on the viscosity of a polymer solution is important in the practical aspects of processing and synthesizing polymers. 3 Over the past few years, ionic liquids, ILs, have been considered as green and designer solvents. In polymer science ionic liquids are used as solvents for polymerization processes and as components of polymeric materials owing to the combination of their unique chemical stability, low volatility, high conductivity, and ability to dissolve organic and inorganic compounds.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Interactions of Poly(ethylene oxide) and Ionic Liquid 1-Butyl-3-methyl-imidazolium Bromide by Viscosity and Spectroscopy

Mehrdad

Niknam

2016

J. Chem. Eng. Data

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In this research, the solution of poly(ethylene oxide) in binary mixtures of water and ionic liquid, 1-butyl-3-methyl imidazolium bromide, were studied via spectroscopic and viscometric at the temperature range of 288.15–313.15 K. Also, the effects of ionic liquid, 1-butyl-3-methyl imidazolium bromide, on the thermodynamic parameters of dilute aqueous solutions of poly(ethylene oxide), such as polymer–solvent interaction parameter, theta temperature, the heat of dilution parameter, and the entropy of dilution parameter were investigated. Our data indicate that the thermodynamic quality of water for poly(ethylene oxide) is reduced by the addition of 1-butyl-3-methyl imidazolium bromide and increasing temperature. The flow activation energy was calculated and correlated in terms of polymer concentration. The sign of initial slope of the activation energy versus polymer concentration at zero concentration reveals that thermodynamic quality of IL aqueous solutions is reduced by increasing temperature. The type of interactions between poly(ethylene oxide) and 1-butyl-3-methyl imidazolium bromide was studied by Fourier transform infrared (FT-IR) and UV–vis methods. The existence of hydrogen bonding between the imidazolium cation and the oxygen atom of poly(ethylene oxide) was confirmed by the results of FT-IR and UV–vis spectroscopies.

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Effect of the nature of the solvent on the viscosity of dilute and concentrated solutions of polymers with various chain flexibilities

Cited by 20 publications

References 19 publications

Associative Behavior of Lignosulphonates in Moderately Concentrated Water, Water–Salt, and Water–Alcoholic Media

Associative Behavior of Lignosulphonates in Moderately Concentrated Water, Water–Salt, and Water–Alcoholic Media

Hydrodynamic Scaling of Viscosity and Viscoelasticity of Polymer Solutions, Including Chain Architecture and Solvent Quality Effects

Investigation on the Interactions of Poly(ethylene oxide) and Ionic Liquid 1-Butyl-3-methyl-imidazolium Bromide by Viscosity and Spectroscopy

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