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Shear flow of lamellar polymer surfactants

  • Claudia SchmidtEmail author
  • Daniel Burgemeister
Conference paper
Part of the Progress in Colloid and Polymer Science book series (PROGCOLLOID, volume 121)

Abstract

Two new polymer surfactants consisting of a polysiloxane backbone with amphiphilic side chains of the nonionic oligo (ethylene oxide) type have been synthesized. The phase behavior of aqueous solutions of the low-molecular-weight surfactants, from which the side chains are formed, and of the polymer surfactants was characterized by polarizing microscopy and 2H NMR spectroscopy. Both polymers form a lamellar Lα phase over a broad range of concentrations, whereas no liquid-crystalline phases were found for the low-molecular-weight surfactants. The orientation of lamellar solutions of the polymers in steady shear flow was investigated in situ by 2H NMR spectroscopy in cone-and-plate geometry. The NMR results indicate an orientation of the layer normals parallel to the velocity gradient at low shear rates and the formation of multilamellar vesicles (onions) at intermediate shear rates for both polymers. The range of shear rates where NMR spectra characteristic of vesicles are found as well as the state of orientation at high shear rates are different for the two systems.

Key words

Nonionic surfactant Polysoap Lamellar phase Shear flow Rheo-NMR 

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Copyright information

© Springer-Verlag 2002

Authors and Affiliations

  1. 1.Fachbereich Chemie und ChemietechnikUniversität PaderbornPaderbornGermany
  2. 2.Institut für Makromolekulare ChemieUniversität FreiburgFreiburgGermany

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