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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 ~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.

Посилання на статтю:

In situ X-ray scattering study of anisotropic solutions of hydroxypropylcellulose subjected to shear flow / P. Keates and G. R. Mitchell and E. PeuvreI-Disdier and P. Navard // Polymer. – 1993. – Vol 34. – P. 1316-1319.

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