Rheological properties and gelation of aqueous cellulose-NaOH solutions.
The shear rheology of a microcrystalline cellulose dissolved in a 9% NaOH aqueous solution was studied in the steady and oscillatory modes. The cellulose-(9% NaOH-H(2)O) mixtures show not to be true solutions. In the dilute regime, with cellulose concentration below 1%, the rheological behavior is typical of the one of suspensions. The formation of cellulose aggregates is favored when temperature is increased. In the semidilute regime, an irreversible aggregate-based gelation occurs, being faster with increasing temperature.
Roy
Cédric
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Ecole des Mines de Paris, Centre de Mise en Forme des Matériaux, UMR CNRS/Ecole des Mines No 7635, BP 207, 06904 Sophia-Antipolis, France.
Budtova
Tatiana
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Navard
Patrick
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D002482:Cellulose / Q000737:chemistry*; D012212:Rheology; D012972:Sodium Hydroxide / Q000737:chemistry*; D012996:Solutions
D012996:Solutions; D012972:Sodium Hydroxide; D002482:Cellulose