Scaling and Entanglement Properties of Neutral and Sulfonated Polystyrene

Carlos G. Lopez

doi:10.1021/acs.macromol.9b01583

Scaling and Entanglement Properties of Neutral and Sulfonated Polystyrene

Carlos G. Lopez

Materials Science and Engineering

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34 Scopus citations

Abstract

We study the rheological properties of sodium polystyrene sulfonate in salt-free and excess added salt solution. The overlap concentration scales as c∗ ∝ N^-2 (DI water) and c∗ ∝ N^-0.77 (excess salt), corresponding to rodlike and expanded coil conformations, respectively. A comparison of small-angle X-ray scattering and viscosity data reveals that c∗ in salt-free solution may be quantitatively estimated as the point at which the viscosity of a NaPSS solution is ≃5/3 that of the solvent. The entanglement crossover and entanglement density are found to be approximately independent of the concentration of the added salt, and similar to those of neutral polystyrene in good or θ solvents. These results indicate that polymer conformation has a weaker effect on entanglement formation in solution than expected by packing models of polymer entanglement.

Original language	English (US)
Pages (from-to)	9409-9415
Number of pages	7
Journal	Macromolecules
Volume	52
Issue number	23
DOIs	https://doi.org/10.1021/acs.macromol.9b01583
State	Published - Dec 10 2019

All Science Journal Classification (ASJC) codes

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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10.1021/acs.macromol.9b01583

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title = "Scaling and Entanglement Properties of Neutral and Sulfonated Polystyrene",

abstract = "We study the rheological properties of sodium polystyrene sulfonate in salt-free and excess added salt solution. The overlap concentration scales as c∗ ∝ N-2 (DI water) and c∗ ∝ N-0.77 (excess salt), corresponding to rodlike and expanded coil conformations, respectively. A comparison of small-angle X-ray scattering and viscosity data reveals that c∗ in salt-free solution may be quantitatively estimated as the point at which the viscosity of a NaPSS solution is ≃5/3 that of the solvent. The entanglement crossover and entanglement density are found to be approximately independent of the concentration of the added salt, and similar to those of neutral polystyrene in good or θ solvents. These results indicate that polymer conformation has a weaker effect on entanglement formation in solution than expected by packing models of polymer entanglement.",

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AU - Lopez, Carlos G.

PY - 2019/12/10

Y1 - 2019/12/10

N2 - We study the rheological properties of sodium polystyrene sulfonate in salt-free and excess added salt solution. The overlap concentration scales as c∗ ∝ N-2 (DI water) and c∗ ∝ N-0.77 (excess salt), corresponding to rodlike and expanded coil conformations, respectively. A comparison of small-angle X-ray scattering and viscosity data reveals that c∗ in salt-free solution may be quantitatively estimated as the point at which the viscosity of a NaPSS solution is ≃5/3 that of the solvent. The entanglement crossover and entanglement density are found to be approximately independent of the concentration of the added salt, and similar to those of neutral polystyrene in good or θ solvents. These results indicate that polymer conformation has a weaker effect on entanglement formation in solution than expected by packing models of polymer entanglement.

AB - We study the rheological properties of sodium polystyrene sulfonate in salt-free and excess added salt solution. The overlap concentration scales as c∗ ∝ N-2 (DI water) and c∗ ∝ N-0.77 (excess salt), corresponding to rodlike and expanded coil conformations, respectively. A comparison of small-angle X-ray scattering and viscosity data reveals that c∗ in salt-free solution may be quantitatively estimated as the point at which the viscosity of a NaPSS solution is ≃5/3 that of the solvent. The entanglement crossover and entanglement density are found to be approximately independent of the concentration of the added salt, and similar to those of neutral polystyrene in good or θ solvents. These results indicate that polymer conformation has a weaker effect on entanglement formation in solution than expected by packing models of polymer entanglement.

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JO - Macromolecules

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ER -

Scaling and Entanglement Properties of Neutral and Sulfonated Polystyrene

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