Revisit to the intrinsic viscosity-molecular weight relationship of ionic polymers. 5. Further studies on solution viscosity of sodium poly(styrenesulfonates)

Yamanaka, Junpei; Araie, Hidemasa; Matsuoka, Hideki; Kitano, Hiromi; Ise, Norio; Yamaguchi, Takuji; Saeki, Susumu; Tsubokawa, Masakazu

doi:10.1021/ma00023a015

Cited by 27 publications

(24 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Further papers ,, report that, at even lower polymer concentrations, η sp / c values reach a maximum and fall off, in disagreement with eq . The reason for the occurrence of this maximum has been investigated, − but it was recognized that there is still no physical meaning for such a maximum, even though many electrostatic-based mathematical models ,, have tried to adequately describe the viscosity of polyelectrolyte solutions.…”

Section: Resultsmentioning

confidence: 99%

Supramolecular Interactions between Inorganic and Organic Blocks of Pentacyanoferrate/Poly(4-vinylpyridine) Hybrid Metallopolymer

et al. 2012

View full text Add to dashboard Cite

The combination of organic and inorganic molecular building blocks gives rise to hybrid supramolecular materials showing properties from both chemical domains. This work presents the synthesis of metallopolymers made from poly(4-vinylpyridine) (P4VP) and pentacyanoferrate(II) at various polymer repeating unit/[Fe(CN)(5)](3-) ratios (py/Fe) and focuses on the influence of each block on the properties of the other. The solvatochromic shift of the [Fe(CN)(5)](3-) moiety was investigated as a function of the py/Fe ratio and the water molar fraction (X(H(2)O)) of the ethanol/water medium. Asymmetric solvation favoring ethanol was enhanced as the py/Fe ratio increased. The results lead to a modification of the well-established thermodynamical model for asymmetrical solvation and suggest the formation of water-rich domains within the polymer coils with a large number of [Fe(CN)(5)](3-) units. From the macromolecular perspective, the increase of [Fe(CN)(5)](3-) units resulted in higher values of intrinsic viscosity, which is rationalized by the increase of the polymer coil charge density and therefore the increase in hydrodynamic volume due to repulsive electrical forces. Evaluating the intrinsic viscosity of a sample with py/Fe = 25 in solvent mixtures with different water molar fractions, it was found that the hydrodynamic volume is maximized at intermediate X(H(2)O) values, where both the ethanol-soluble uncomplexed polymer block and the water-soluble [Fe(CN)(5)](3-)-pendant units can be suitably solvated, preventing coil shrinkage.

show abstract

Section: Resultsmentioning

confidence: 99%

Supramolecular Interactions between Inorganic and Organic Blocks of Pentacyanoferrate/Poly(4-vinylpyridine) Hybrid Metallopolymer

et al. 2012

View full text Add to dashboard Cite

show abstract

“…Polyelectrolytes exhibit a number of anomalous, characteristic properties when compared to neutral polymer solutions and have been extensively studied, over the past forty years. [7][8][9][10] Polyelectrolytes exhibit unique rheological properties, as evidenced by their reduced viscosity which shows both a maximum at low concentrations [11][12][13][14][15][16][17][18][19][20][21] and a minimum at high concentrations. 22,23 There are many studies in the literature of these rheological properties but the results are often contradictory, as detailed in Section VI for NaPSS.…”

Section: Background: Experimentsmentioning

confidence: 99%

Rheology of Sulfonated Polystyrene Solutions

1998

View full text Add to dashboard Cite

We report the apparent viscosity of aqueous solutions of a well-characterized synthetic polyelectrolyte, the sodium salt of polystyrene sulfonate. Using two rheometers we measure the apparent viscosity over more than five decades of shear rate to determine the Newtonian viscosity and the onset of shear thinning, which is inversely proportional to the relaxation time. We study five decades of polyelectrolyte concentration, from the dilute to the entangled regimes, and three decades of added salt (NaCl) concentration, on a single polyelectrolyte sample. Much of the viscosity data in the literature are shown to be in the shear thinning regime and are not indicative of the Newtonian viscosity. Our data for viscosity and longest relaxation time are qualitatively consistent with a recent scaling theory. There are systematic deviations from this simple theory, including the failure of the well-established Fuoss law, which is shown to be obeyed by the apparent viscosity only at higher shear rates.

show abstract

“…Yamamaka et al 21 have measured the shear viscosity of dilute solutions of the uniformly charged polyelectrolyte, so- dium poly͑styrenesulfonate͒, over a range of shear rates. The observed intrinsic viscosity was up to a factor of 2 larger than the theoretical prediction for an uncharged rigid rod with a length equal to the fully stretched length of the polymer.…”

Section: Charged Fibers At Moderate Pe Rmentioning

confidence: 99%

Rheology of dilute suspensions of charged fibers

Chen

Koch

1996

Physics of Fluids

View full text Add to dashboard Cite

The rheology of a dilute suspension of charged fibers with a large ratio of length L to diameter d is examined. The fibers may possess both a net charge and a charge dipole and it is assumed that the Hartmann number is small. The double layer thickness is large compared with the rod diameter and may be comparable with the fiber length. Although the shear rate is sufficiently small so that the deformation of the double layer is small, no restriction is placed on the rotary Péclet number of the rods. The velocity disturbance caused by the rods is neglected when calculating the double layer deformation. This approximation is accurate when /LϭO(1) and L/d is very large, but leads to an overestimate of the ion cloud distortion for small values of /L or moderate values of L/d. The counterion cloud affects the stress both directly through a primary electroviscous stress and indirectly by exerting an electric torque that changes the fiber orientation distribution. The additional stress caused by electrostatics shear thins for a fiber with a net charge. However, when the fiber has a charge dipole, the electrical stress may increase with increasing shear rate at sufficiently high Péclet numbers. At very high Péclet numbers, the electrical torque can lead to a fixed orientation of the fibers near the flow direction of the simple shear flow.

show abstract

Revisit to the intrinsic viscosity-molecular weight relationship of ionic polymers. 5. Further studies on solution viscosity of sodium poly(styrenesulfonates)

Cited by 27 publications

References 3 publications

Supramolecular Interactions between Inorganic and Organic Blocks of Pentacyanoferrate/Poly(4-vinylpyridine) Hybrid Metallopolymer

Supramolecular Interactions between Inorganic and Organic Blocks of Pentacyanoferrate/Poly(4-vinylpyridine) Hybrid Metallopolymer

Rheology of Sulfonated Polystyrene Solutions

Rheology of dilute suspensions of charged fibers

Contact Info

Product

Resources

About