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In situ X-ray scattering study of anisotropic solutions of hydroxypropylcellulose subjected to shear flow

Abstract : Molecular orientation parameter values measured by laboratory-based X-ray scattering techniques are reported for liquid crystalline solutions of hydroxypropylcellulose in water subjected to a range of steady shear rates. The global orientation exhibits a marked transition from a low orientation at low shear rates to high values approximately 0.5 at higher shear rates. This transition occurs at shear rates in the range of 0.3-1 s-1 and correlates quantitatively with similar transitions observed using small-angle light scattering. This behaviour is attributed to an out-of-shearing plane to an in-shearing plane transition which has been predicted theoretically by Larson and Ottinger.
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Submitted on : Monday, February 20, 2012 - 2:13:01 PM
Last modification on : Thursday, September 24, 2020 - 5:22:54 PM

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P.A. Keates, G.R. Mitchell, Edith Peuvrel-Disdier, Patrick Navard. In situ X-ray scattering study of anisotropic solutions of hydroxypropylcellulose subjected to shear flow. Polymer, Elsevier, 1993, 34 (6), pp.Pages 1316-1319. ⟨10.1016/0032-3861(93)90792-9⟩. ⟨hal-00672042⟩

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