Shear flow behavior of a dynamically symmetric polymeric bicontinuous microemulsion

Ning Zhou, Frank S. Bates*, Timothy P. Lodge, Wesley R. Burghardt

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

We have investigated the shear flow behavior of a dynamically symmetric polymeric bicontinuous microemulsion using rheology and in situ small angle x-ray scattering. The microemulsion consists of a ternary blend of poly (ethylene-alt-propylene) (PEP), poly (butylene oxide) (PBO), and a PEP-PBO diblock copolymer. Steady shear experiments reveal an unusual shear thickening behavior at the onset of the non-Newtonian regime, which is consistent with the strain hardening and frequency thickening (at large strains) under oscillatory shear. Scattering experiments indicate development of anisotropy in the bicontinuous structure within the thickening regime. Subsequent shear thinning is observed at intermediate shear rates. Shear-induced bulk phase separation is detected at very high rates. This work complements previous studies on a dynamically extremely asymmetric bicontinuous microemulsion, and thereby establishes the universal rheological properties of polymeric microemulsions. Possible underlying molecular mechanisms for these rich rheological phenomena are discussed.

Original languageEnglish (US)
Pages (from-to)1027-1046
Number of pages20
JournalJournal of Rheology
Volume51
Issue number5
DOIs
StatePublished - 2007

Keywords

  • Polymeric bicontinuous microemulsion
  • Rheology
  • Shear thickening
  • Shear-induced phase separation

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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