Preparation of sulfoacetate derivatives of cellulose by direct esterification |
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Authors: | Chauvelon Gaëlle Buléon Alain Thibault Jean-François Saulnier Luc |
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Affiliation: | INRA Centre de Recherche Agro-Alimentaire, BP 71627, 44316 Nantes Cedex 03, France. |
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Abstract: | A new and efficient method for the preparation in one step of water-soluble cellulose acetate sulfate derivatives (CAS) is reported. Acetylation and sulfation were carried out simultaneously, using a mixture of acetic anhydride and sulfuric acid in glacial acetic acid. The reaction time and the amount of acetic anhydride were optimized and the method provided water-soluble esters, with a degree of acetylation in the range 1.6 and 2.4 and a degree of sulfation of 0.3. This method has been successfully applied to pure cellulose and to cellulose-enriched materials obtained from agricultural by-products. The product exhibited a high viscosity in aqueous solution suggesting interesting rheological properties. |
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Keywords: | Cellulose Wheat bran Maize bran Esterification Acetylation Sulfation Water-soluble ester |
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