Orientational behaviour of thermotropic and lyotropic liquid crystal polymer systems under shear flowAndresen, E.M. and Mitchell, G.R. (1998) Orientational behaviour of thermotropic and lyotropic liquid crystal polymer systems under shear flow. Europhysics Letters, 43 (3). pp. 296-301. ISSN 0295-5075 Full text not archived in this repository. It is advisable to refer to the publisher's version if you intend to cite from this work. See Guidance on citing. To link to this item DOI: 10.1209/epl/i1998-00355-6 Abstract/SummaryA comparison is made of the development of global orientation during shearing of lyotropic solutions of hydroxypropylcellulose with that observed for the thermotropic phase of hydroxypropylcellulose. At shear rates the behaviour of the two systems is similar, both during steady-state shear, and in terms of relaxation following cessation of shear flow. At low shear rates, the levels of orientation observed for the thermotropic system are substantially greater than observed for the lyotropic solutions. The relationship of these differences to variations in molecular parameters, viscous stress and to director tumbling is discussed.
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