Issue |
Europhys. Lett.
Volume 49, Number 2, January II 2000
|
|
---|---|---|
Page(s) | 255 - 261 | |
Section | Interdisciplinary physics and related areas of science and technology | |
DOI | https://doi.org/10.1209/epl/i2000-00142-5 | |
Published online | 01 September 2002 |
Linear viscoelasticity and director dynamics of nematic liquid crystalline polymer melts
Department of Chemical Engineering and Materials Science,
University of Minnesota 421 Washington Ave. S.E., Minneapolis, MN 55455, USA
Corresponding author: long@lps.u-psud.fr
Received:
17
May
1999
Accepted:
4
November
1999
We describe the linear viscoelastic response of monodomains of
unentangled nematic liquid crystalline polymers, using a generalized
Rouse model. We calculate the dynamic relaxation functions analogous
to the Leslie viscosities. As a consequence of the coupling of the
macroscopic director orientation to Rouse relaxation of the
chain conformations, we predict: 1) a non-monotonic evolution of the
director orientation after a step deformation and continuous tumbling
in steady shear for extended chains (with no hairpins), and flow
alignment of anisotropic Gaussian chains (with many hairpins), and
2) a phenomenon of “director recoil” in the response of
to a
transient magnetic field.
PACS: 83.10.Nn – Polymer dynamics / 83.70.Jr – Liquid crystals: nematic, cholesteric, smectic, discotic, etc / 83.50.Fc – Linear viscoelasticity
© EDP Sciences, 2000
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