Shear induced textures of thermotropic acetoxypropylcellulose

Jean-Bernard Riti 1 M. T. Cidade 2 M.H. Godinho 2 A. F. Martins 2 Patrick Navard 1
1 CEMEF - Centre de Mise en Forme des Matériaux
2 Departamento de Ciecaronncia dos Materiais and CENIMAT
Abstract : Acetoxypropylcellulose is a thermotropic cellulose derivative which is cholesteric from below room temperature up to 170 °C. Its textures during and after shear flow were studied by optical microscopy and small-angle light scattering (SALS) light scattering. The main features are similar to those occurring in hydroxypropylcellulose solutions, i.e., a polydomain texture evolving into a striated texture, as seen by optical microscopy. Elliptical or else four lobes with a streak are seen in the SALS patterns. Defects appearing as short dark lines not aligned with the flow direction are shown to be responsible for the existence of the four lobes of the SALS patterns. In addition these defects seem to be located where the band texture develops during relaxation
Keywords : liquid crystal polymers cholesteric liquid crystals shear flow optical microscopy light scattering rheology molecular orientation Liquid crystalline polymer Texture Acetoxypropylcellulose
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Article dans une revue
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Contributeur : Magalie Prudon <>
Soumis le : mercredi 9 mars 2011 - 10:12:08
Dernière modification le : lundi 12 novembre 2018 - 10:59:43

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ENSMP | ENSMP_CEMEF | PARISTECH | INSTITUT-TELECOM | PSL

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Jean-Bernard Riti, M. T. Cidade, M.H. Godinho, A. F. Martins, Patrick Navard. Shear induced textures of thermotropic acetoxypropylcellulose. Journal of rheology, American Institute of Physics, 1997, 41 (6), pp.Pages 1247-1260. ⟨10.1122/1.550842⟩. ⟨hal-00574914⟩

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