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Transient and stationary flow behaviour of side chain liquid-crystalline polymers: Evidence of a shear-induced isotropic-to-nematic phase transition

Pujolle-Robic, C., Olmsted, P.D. and Noirez, L. (2002) Transient and stationary flow behaviour of side chain liquid-crystalline polymers: Evidence of a shear-induced isotropic-to-nematic phase transition. Europhysics Letters, 59 (3). pp. 364-369. ISSN 1286-4854

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Abstract

This letter describes the non-linear rheology of the isotropic phase of a thermotropic side chain liquid-crystal polymer (SCLCP), from which we infer a flow-induced iso- tropic-to-nematic (IN) phase transition above a critical shear stress and construct non-equilib- rium phase diagrams. In contrast to the well-studied wormlike-micellar solutions and predictions for simple liquid-crystalline systems, the critical stress does not vanish as the equilibrium transition temperature is approached from the above. We postulate that this is due to: i) the coupling between mesogens and the polymer backbone, whose equilibrium oblate nematic backbone conformation contrasts with the prolate non-equilibrium conformation; and ii) the peculiar topological constraints in SCLCP melts, which have been previously postulated as leading to long-lived clusters.

Item Type: Article
Copyright, Publisher and Additional Information: © 2002 EDP Sciences. Reproduced in accordance with the publisher's self-archiving policy.
Academic Units: The University of Leeds > Faculty of Maths and Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds)
The University of Leeds > University of Leeds Research Centres and Institutes > Interdisciplinary Research Centre in Polymer Science and Technology (Leeds)
Depositing User: Repository Officer
Date Deposited: 08 Feb 2007
Last Modified: 08 Feb 2013 17:03
Published Version: http://dx.doi.org/10.1209/epl/i2002-00203-9
Status: Published
Publisher: EDP Sciences
Refereed: Yes
Identification Number: 10.1209/epl/i2002-00203-9
URI: http://eprints.whiterose.ac.uk/id/eprint/1953

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