Equilibrium dynamics of a polymer bicontinuous microemulsion

Kristin L. Brinker, Simon G.J. Mochrie, Wesley R. Burghardt*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

The equilibrium dynamics of a bicontinuous microemulsion composed of polystyrene, polyisoprene, and poly(styrene-block-isoprene) was characterized using rheology and X-ray photon correlation spectroscopy (XPCS), XPCS measurements, which probed dynamics at length scales comparable to the microemulsion domain size, show stretched-exponential relaxation of the dynamic structure factor and a wavevector-dependent Onsager coefficient. Values of the Onsager coefficient corresponding to zero wavevector (q = 0) and the peak of the static structure factor (q = q max) were independently used to test rheological predictions for bicontinuous microemulsions developed by Pätzold and Dawson. The theory, which is based on a Landau-Ginzburg model, describes the shape of the relaxation spectrum and predicts the temperature dependence of the rheological properties quite well. However, for either case of the Onsager coefficient (at q = 0 and q = q max), the theory fails to predict the absolute values of the zero-shear viscosity and average relaxation time of the microemulsion. The results of this study highlight a need for the development of more sophisticated theory to describe the rheology of bicontinuous microemulsions.

Original languageEnglish (US)
Pages (from-to)5150-5160
Number of pages11
JournalMacromolecules
Volume40
Issue number14
DOIs
StatePublished - Jul 10 2007

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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