Effect of shear on poly(styrene-b-isoprene) copolymer micelles

Joona Bang, Timothy P. Lodge

Research output: Contribution to journalArticle

Abstract

The use of various shearing apparatuses to study the phase behavior of poly(styrene-b-isoprene) diblock copolymer micelles is described. A DMTA rheometer was modified so that one can apply oscillatory shear and obtain the scattering pattern along the shear gradient direction. A cone and plate shear cell was designed to access scattering along the shear vorticity direction, and both oscillatory and steady shear can be applied. The most popular way to employ steady shear on relatively low viscosity fluids is to use a Couette cell, because a high shear rate can be readily achieved without disturbing the sample by overflow. In this work, oscillatory shear was used to obtain a single crystal-like scattering pattern, and thereby to examine the mechanism of the thermotropic transition between face-centered cubic (fee) and body-centered cubic (bcc) lattices. By applying the steady shear, the response of the fee lattices to various shear rates is discussed.

Original languageEnglish
Pages (from-to)227-232
Number of pages6
JournalKorea Australia Rheology Journal
Volume19
Issue number4
Publication statusPublished - 2007 Dec 1

Keywords

  • Block copolymer micelles
  • Body-centered cubic (bcc)
  • Face-centered cubic (fee)
  • Oscillatory shear
  • Shear cell
  • Steady shear

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes

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