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Compressive elasticity in polymer Couette flow

Published online by Cambridge University Press:  14 March 2007

D. E. Dunstan  and
Y. Wei
D. E. Dunstan*
Affiliation:
Department of Chemical & Biomolecular Engineering, The University of Melbourne, 3010, Australia
Y. Wei
Affiliation:
Department of Chemical & Biomolecular Engineering, The University of Melbourne, 3010, Australia
*
[email protected]
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Abstract

Accepted models of polymers in flow assume that the polymer chains stretch with the elastic energy stored as a reduced entropy of the chain. The first optical measurement of changes in the Polydiacetylene 4-Butoxycarbonylmethylurethane (4-BCMU) polymer Kuhn segment lengths in Couette flow are reported. This polymer in semi-dilute solution shows a reducing conjugated segment length with increasing flow rate. The visco-elasticity for this polymer is attributed to compressive entropy loss in the chain. This is a reversal of the physics assumed in models of polymer flow based on the Kuhn model. The restricted volume of the chain due to the presence of the neighbouring polymers results in compressive hydrodynamic forces on the chains in Couette flow at semi-dilute concentrations.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 38 , Issue 1 , April 2007 , pp. 93 - 95
Copyright
© EDP Sciences, 2007

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