Rheological properties of sulfoacetate derivatives of cellulose |
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Authors: | Chauvelon Gaëlle Doublier Jean-Louis Buléon Alain Thibault Jean-François Saulnier Luc |
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Institution: | INRA Centre de Recherche Agro-Alimentaire, BP 71627, 44316 Nantes Cedex 03, France. |
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Abstract: | Water-soluble cellulose acetate sulfate derivatives (CAS) have been prepared through chemical reaction involving sulfuric acid as a catalyst. These CAS have been obtained from cellulosic materials of different origins (pure cellulose, wheat bran, maize bran) and their rheological behavior in salt-free aqueous solution has been estimated in dilute and semi-dilute regime using dynamic viscoelastic and viscosity measurements. Influence of concentration, temperature of solubilization and temperature of measurement has been investigated. Weak gel-like properties were exhibited at elevated concentration (typically above 7-8 g/L). These systems also exhibited thixotropic properties: the structure was partly broken down upon shearing and recovered at rest. They also displayed thermoreversibility with large hysteresis, the melting temperature being approximately 15 degrees C higher than the temperature at which gelation took place. These overall observations clearly indicate that these distinctive properties arise from intermolecular association of the macromolecular chains of the cellulose derivative. |
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Keywords: | Cellulose CAS Water-soluble cellulose derivatives Rheological properties Gelling temperature Melting temperature |
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