On the viscosity of sodium poly(styrene sulphonate), a flexible polyelectrolyte

Ganter, J.L.M.S; Milas, M.; Rinaudo, Marguerite

doi:10.1016/0032-3861(92)90569-i

Cited by 27 publications

(35 citation statements)

References 15 publications

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“…Take the commonly investigated strong polyelectrolyte sodium polystyrene sulfonate ͑NaPSS͒, for example. Since its degree of ionization is about 90%, 23 we can approximately use a bead with a diameter of 0.25 nm to represent its monomer. Accordingly, l B is about 2.8 for an aqueous solution at 25°C.…”

Section: Resultsmentioning

confidence: 99%

Computer simulations of diffusion and dynamics of short-chain polyelectrolytes

Zhou

Chen

2006

The Journal of Chemical Physics

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Brownian dynamics simulations are conducted to investigate the diffusional and dynamic properties of polyelectrolytes in dilute salt-free solutions. The polyelectrolyte molecule is represented by a bead-spring chain in a primitive model. The long-range hydrodynamic and Coulomb interactions are both taken into consideration through the Ewald summations for the first time. The major finding of our simulations is that the dependence of the long-time chain diffusivity on the Coulomb interaction strength is very different from that of the Kirkwood short-time diffusivity, which simply shows a trend nearly opposite to the chain size. When ignoring the hydrodynamic interaction (HI), the coupling effect between the chain and its counterions gives rise to a noticeable increase in the long-time diffusivity at intermediate electrostatic interaction strengths. However, the incorporation of HI suppresses this effect to a degree that one can no longer discern it. Moreover, the rotational relaxation is found to show a dependence opposite to that of the gyration radius relaxation.

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Section: Resultsmentioning

confidence: 99%

Computer simulations of diffusion and dynamics of short-chain polyelectrolytes

Zhou

Chen

2006

The Journal of Chemical Physics

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“…Scaling theories following de Gennes' isotropic model offer a simple way to interpret the physical properties of flexible polyelectrolytes. [3][4][5] Despite a large number of experimental reports on NaPSS [6][7][8][9][10][11][12][13][14][15][16][17] (and other flexible polyelectrolytes [18][19][20][21][22][23][24][25][26] ) several important scaling laws have not been established.…”

Section: Introductionmentioning

confidence: 99%

Conformation and dynamics of flexible polyelectrolytes in semidilute salt-free solutions

Lopez

Richtering

2018

The Journal of Chemical Physics

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We present steady shear rheology data for sodium polystyrene sulfonate (NaPSS) in semidilute unentangled salt-free aqueous solution as a function of polymer concentration (c) and degree of polymerisation (N). The measured terminal modulus (G) agrees with the scaling prediction of G ≃ kTc/N. The specific viscosity varies with the degree of polymerisation as η ∝ N. The observed dependence differs with the linear relation expected from the Rouse model for ideal chains as predicted by de Gennes' scaling model and subsequent theories. Together with the diffusion data of Oostwal et al., our results suggest that chains may follow non-Gaussian statistics beyond the correlation length (ξ). Small angle neutron scattering data on salt-free semidilute solutions at low polymer concentrations partially support this hypothesis but do not confirm it. The electrostatic Kuhn length of NaPSS salt-free solutions is found to be proportional and slightly larger than the correlation length (L ≃ 1.3ξ). This result agrees well with the scaling model of Dobrynin et al. Radii of gyration (R) data as a function of polymer concentration reveal that a concentrated regime (R ∝ c) does not occur for NaPSS in the concentration range considered (c ≲ 4M). We conclude by comparing the predictions of the scaling model of Dobrynin et al. and Muthukumar's double screening theory with viscosity data for different polyelectrolyte-solvent systems. Dobrynin's model provides a better description of experimental observations. Our findings confirm several aspects of current models for polyelectrolyte solutions but some deviations from theory remain.

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“…For pure PSS and ION, Newtonian behaviour has been observed according to the literature. 17,18 However, in our experiment, non-Newtonian behaviour was observed at low shear rate (less than about 180 s À1 ) for PEO, and a Newtonian plateau was observed at a higher shear rate. All the blends had the same behaviour as pure PEO.…”

Section: Viscosity Measurementsmentioning

confidence: 65%