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Wavy texture in pressure-driven startup flows of liquid crystalline polymer solutions through a slit cell: effects of polymer concentration and solution temperature

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Abstract

Dependences of wavy texture on polymer concentration and solution temperature were examined using aqueous solutions of hydroxypropylcellulose (HPC). The phase of aqueous solution of HPC varied from an isotropic (I) system to a liquid crystalline (LC) one through a biphasic (I+LC, LC+I) system with increasing the HPC concentration and/or decreasing the solution temperature. The wavy texture emerged not only in the LC system but also in the LC+I system. Furthermore, induction time of wavy texture was evaluated in terms of apparent shear strain. It is suggested that polydomain structures included in liquid crystalline systems and droplets of isotropic phase in biphasic systems affect the initial stage of emergence of wavy texture at low shear rates.

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Authors and Affiliations

  1. Department of Mechanophysics Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita Osaka, 565-0871, Japan

    Noriyasu Mori, Shinsuke Ogiri, Atsushi Numata & Takehiro Yamamoto

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  1. Noriyasu Mori
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  2. Shinsuke Ogiri
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  3. Atsushi Numata
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  4. Takehiro Yamamoto
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Correspondence to Noriyasu Mori.

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Mori, N., Ogiri, S., Numata, A. et al. Wavy texture in pressure-driven startup flows of liquid crystalline polymer solutions through a slit cell: effects of polymer concentration and solution temperature. Rheol Acta 44, 478–484 (2005). https://doi.org/10.1007/s00397-004-0428-x

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  • DOI: https://doi.org/10.1007/s00397-004-0428-x

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