Dynamic light scattering studies of ternary polymer solutions in porous media

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

Research output: Contribution to journalArticle

Abstract

The tracer diffusion of probe polystyrene (PS) molecules in a matrix polymer solution confined in a porous medium has been studied by using dynamic light scattering (DLS). In these experiments, a sample of controlled pore glass was equilibrated with a ternary solution consisting of PS, polytetrahydrofuran (PTHF), and the common solvent 2-fluorotoluene (2FT); PTHF and 2FT are isorefractive with the porous glass. The PS concentration was held low, whereas the PTHF concentration c m exterior to the pore was systematically increased within the homogeneous regime. The tracer diffusion coefficient D p of PS in the interior of the pore decreased more rapidly than did the tracer diffusion coefficient D f in the exterior as c m increased in the range below the overlap concentration c m*; this is ascribed to the enhanced polymer-polymer interactions in the narrow pore channels. However, D p showed a weaker dependence on c m than D f as c m exceeded c m*. This result is ascribed to the smaller topological constraint exerted by PTHF macromolecules in the interior of the pore than in the exterior free solution because of the lower interior PTHF concentration. The short-time characteristics of the DLS autocorrelation function are also reported.

Original languageEnglish (US)
Pages (from-to)1759-1765
Number of pages7
JournalMacromolecules
Volume27
Issue number7
StatePublished - 1994

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Dynamic light scattering
Polymer solutions
Polystyrenes
Porous materials
Polymers
Glass
Macromolecules
Autocorrelation
Molecules
poly(tetrahydrofuran)
Experiments
2-fluorotoluene

ASJC Scopus subject areas

  • Materials Chemistry

Cite this

Zhou, Z., Teraoka, I., Langley, K. H., & Karasz, F. E. (1994). Dynamic light scattering studies of ternary polymer solutions in porous media. Macromolecules, 27(7), 1759-1765.

Dynamic light scattering studies of ternary polymer solutions in porous media. / Zhou, Ziming; Teraoka, Iwao; Langley, Kenneth H.; Karasz, Frank E.

In: Macromolecules, Vol. 27, No. 7, 1994, p. 1759-1765.

Research output: Contribution to journalArticle

Zhou, Z, Teraoka, I, Langley, KH & Karasz, FE 1994, 'Dynamic light scattering studies of ternary polymer solutions in porous media', Macromolecules, vol. 27, no. 7, pp. 1759-1765.
Zhou, Ziming ; Teraoka, Iwao ; Langley, Kenneth H. ; Karasz, Frank E. / Dynamic light scattering studies of ternary polymer solutions in porous media. In: Macromolecules. 1994 ; Vol. 27, No. 7. pp. 1759-1765.
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