Fluctuation Enhancement and Reduction in Sheared Polymer Solutions

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Using time-resolved small-angle light scattering, we present the first experimental evidence that a semidilute polymer solution successively subjected to a high-strain-rate shear flow followed by a low-strain-rate shear flow displays concentration fluctuation enhancement and fluctuation reduction (Maxwell effect), respectively. During the Maxwell fluctuation reduction, the flow-induced intermediate scattering peaks present in the structure factor at high strain rates are eliminated and the scattering patterns rotate toward a direction at 90° with the flow direction. The Maxwell rotation and stretching of the shear-enhanced fluctuations and the corresponding pattern orientation angle are satisfactorily described by the so-called Maxwell construction applied to the Helfand−Fredrickson structure factor of the shear-enhanced fluctuations.

Original languageEnglish (US)
Pages (from-to)5639-5642
Number of pages4
Issue number20
StatePublished - Sep 1 1994

ASJC Scopus subject areas

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


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