Rheological properties of microfibrillar suspension of TEMPO-oxidized pulp |
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Authors: | Elsa Lasseuguette Denis Roux Yoshiharu Nishiyama |
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Affiliation: | (1) Centre de Recherche sur les Macromolécules Végétales, CNRS/UJF/ICMG, BP 53, 38041 Grenoble Cedex 9, France;(2) Laboratoire de Rhéologie, UMR 5520 UJF/CNRS/INPG, BP 53, 38041 Grenoble Cedex 9, France |
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Abstract: | The rheology of cellulose microfibril suspensions from TEMPO-oxidized pulp was investigated. The suspension showed a pseudo-plastic and thixotropic behavior, slowly evolving with time under a given shear rate. The viscosity was proportional to the concentration up to the critical concentration of 0.23%. Above it, the viscosity followed a power law with exponents from 2 to 6 depending on the shear rate, and the system showed shear thinning behavior and behaved gel-like. Below this concentration, the system was more Newtonian. Birefringence measurement of 0.44% and 0.78% suspension showed that microfibrils alignment saturated at a small shear rate with a Herman’s orientation parameter below 0.65 probably due to the interconnection of microfibrils. |
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Keywords: | Cellulose microfibrils TEMPO oxidation Rheology |
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