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Recoverable shear strain of liquid crystal‐forming concentrated hydroxypropyl cellulose solutions
Author(s) -
Suto Shinichi,
Mitamura Junya,
Sasaki Yasuyuki
Publication year - 2002
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.10724
Subject(s) - liquid crystal , isotropy , materials science , shear stress , shear (geology) , phase (matter) , hydroxypropyl cellulose , cellulose , cylinder , composite material , thermodynamics , polymer chemistry , chemistry , organic chemistry , geometry , polymer , optics , physics , optoelectronics , mathematics
The recoverable shear strain ( S R ) for the liquid crystal‐forming hydroxypropyl cellulose solutions was determined by means of a concentric cylinder rotational apparatus as functions of shear stress prior to recovery and concentration of the solutions at 30°C. S R greatly depended on shear stress and concentration; the phase of the solution (the single phase or biphase) governed the dependences of S R on stress and concentration. S R increased with increasing stress for the single phase and decreased for the biphase. S R seemed to be related to the die swell ( B ): S R ∝ B n . S R exhibited a maximum and a minimum with respect to concentration. S R for the cellulosic cholesteric liquid crystalline solutions was greater than that for the isotropic solutions. A model was proposed for explaining the greater S R . © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 85: 865–872, 2002