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Dielectric and Electroviscous Properties in Flowing Polymer Systems

  • Hermann Block

Abstract

The dynamic behavior of polymer solutions and their relation to macro-molecular properties is most commonly investigated in terms of the study of viscosity or of dynamic birefringence. Of these techniques the latter provides the more direct information about macromolecular conformation and distortion in shear while the former, in terms of viscoelastic behavior in particular, gives perhaps more direct evidence on the normal mode relaxations in flow. As well as these dynamic techniques which apply to solutions being subjected to flow fields there are a wide range of techniques which are extensively applied in still solutions with the purpose of obtaining information on the conformation and molecular motion of macromolecules. However, these techniques have only infrequently been employed in situations where the solution is simultaneously subjected to a flow field. At least in principle, extra information characterizing macromolecules or even colloidal or particulate suspensions can result from investigating shear induced changes in some of these properties. Thus, changes in scattered light intensity1 and in permittivity in flow have received some attention and it is the latter technique which is the subject of this chapter. Although no formal name has been coined for the study of permittivity of flowing liquids it is suggested that the term flow modified permittivitymight be appropriate.

Keywords

Shear Rate Relative Permittivity High Shear Rate Ethyl Cellulose Induce Polarization 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1986

Authors and Affiliations

  • Hermann Block
    • 1
  1. 1.School of Industrial ScienceCranfield Institute of TechnologyCranfield, BedfordUK

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