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Shear Alignment Behavior of Nematic Solutions Induced by Ultralong Side-Group Liquid Crystal Polymers

Kempe, M. D. and Kornfield, J. A. (2003) Shear Alignment Behavior of Nematic Solutions Induced by Ultralong Side-Group Liquid Crystal Polymers. Physical Review Letters, 90 (11). Art. no. 115501. ISSN 0031-9007. http://resolver.caltech.edu/CaltechAUTHORS:KEMprl03

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Abstract

Addition of a low concentration of a very long (430 kg/mol) side group liquid crystal polymer is shown to produce dramatic changes in the flow characteristics of a calamitic nematic liquid crystal. This polymer causes a typical flow-aligning nematic liquid crystal to align near the velocity gradient direction rather than near the velocity direction, corresponding to having a tumbling parameter lambda<–1, for concentrations greater than 7.5% polymer. Such flow-aligning behavior has not been reported previously in a calamitic nematic. The large molecular weight of the present polymer relative to those examined in the prior literature is responsible for these new phenomena.


Item Type:Article
Additional Information:©2003 The American Physical Society (Received 10 October 2002; published 17 March 2003) We thank Chris Ober and Jagdish Jethalamari for help with synthesis,Weijun Zhou for help with instrumentation, and AFOSR LC-MURI for funding for this project.
Subject Keywords:liquid crystal polymers; nematic liquid crystals; shear flow; velocity; molecular weight
Record Number:CaltechAUTHORS:KEMprl03
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:KEMprl03
Alternative URL:http://dx.doi.org/10.1103/PhysRevLett.90.115501
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:1709
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:13 Feb 2006
Last Modified:26 Dec 2012 08:45

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