Diffusion of solvated polystyrene confined in a porous medium at near-Θ conditions

Ziming Zhou, Iwao Teraoka, Kenneth H. Langley, Frank E. Karasz

Research output: Contribution to journalArticle

Abstract

The dynamic light scattering (DLS) technique was applied to polystyrene fractions of different molecular weights dissolved in the near-Θ solvent trans-decahydronaphthalene and confined in a porous glass bead. Diffusion coefficients were measured for the polymer in the interior of the porous medium and in the surrounding free solution. Diffusion, when normalized to take into account solvent viscosity and temperature, was slower in the Θ solvent than in the good solvent 2-fluorotoluene, a result being ascribed to a stronger hydrodynamic interaction for a compact Gaussian chain in the pore channels than for a chain with excluded volume. At higher temperatures, the decrease in the reduced diffusivity was larger than expected for the increased radius of gyration of the polystyrene chain in the better solvent. At the same time, the DLS autocorrelation function exhibited a pronounced deviation from a single-exponential decay. Enhanced interaction between swelling polymer chains in the narrow pore channels is considered to have increased the concentration coefficient of the friction coefficient for translational motion and thus to have resulted in the decrease of the diffusion coefficient at a low, but nonzero, polymer concentration.

Original languageEnglish (US)
Pages (from-to)7402-7405
Number of pages4
JournalMacromolecules
Volume27
Issue number25
StatePublished - 1994

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Polystyrenes
Porous materials
Polymers
Dynamic light scattering
Autocorrelation
Swelling
Hydrodynamics
Molecular weight
Viscosity
Friction
Glass
Temperature

ASJC Scopus subject areas

  • Materials Chemistry

Cite this

Diffusion of solvated polystyrene confined in a porous medium at near-Θ conditions. / Zhou, Ziming; Teraoka, Iwao; Langley, Kenneth H.; Karasz, Frank E.

In: Macromolecules, Vol. 27, No. 25, 1994, p. 7402-7405.

Research output: Contribution to journalArticle

Zhou, Z, Teraoka, I, Langley, KH & Karasz, FE 1994, 'Diffusion of solvated polystyrene confined in a porous medium at near-Θ conditions', Macromolecules, vol. 27, no. 25, pp. 7402-7405.
Zhou, Ziming ; Teraoka, Iwao ; Langley, Kenneth H. ; Karasz, Frank E. / Diffusion of solvated polystyrene confined in a porous medium at near-Θ conditions. In: Macromolecules. 1994 ; Vol. 27, No. 25. pp. 7402-7405.
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