Evidence of shear-induced polymer release from a swollen gel particle

Sylvie Vervoort 1 Tatiana Budtova 1
1 CEMEF - Centre de Mise en Forme des Matériaux
Abstract : The influence of simple shear flow on the behaviour of an isolated polyelectrolyte hydrogel particle swollen in an aqueous hydroxypropylcellulose solution was studied by rheo-optics. When submitted to a constant shear stress, an initially spherical particle deforms quickly to adopt a stable ellipsoidal form. Upon reaching a first stress threshold, some liquid is released from the particle. This liquid release is determined by a critical deformation value above which the gel cannot retain all of its solvent. At stresses above a second threshold value, small droplets of liquid are secreted from the particle and move away in the flow direction.
Keywords : hydrogel deformation controlled release simple shear flow
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Communication dans un congrès
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https://hal-mines-paristech.archives-ouvertes.fr/hal-00531757
Contributeur : Corinne Matarasso <>
Soumis le : mercredi 3 novembre 2010 - 16:43:04
Dernière modification le : lundi 17 février 2020 - 17:40:28

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Sylvie Vervoort, Tatiana Budtova. Evidence of shear-induced polymer release from a swollen gel particle. Colloquium on Formula III - New Concepts and Strategies in Formulation, Oct 2001, Montpellier, France. p.553-558, ⟨10.1002/pi.1131⟩. ⟨hal-00531757⟩

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