Preparation of sulfoacetate derivatives of cellulose by direct esterification.
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.
Chauvelon
Gaëlle
G
INRA Centre de Recherche Agro-Alimentaire, BP 71627, 44316 Nantes Cedex 03, France.
Buléon
Alain
A
Thibault
Jean-François
JF
Saulnier
Luc
L
D000085:Acetates / Q000737:chemistry*; D000089:Acetic Anhydrides / Q000737:chemistry; D000107:Acetylation; D002482:Cellulose / Q000031:analogs & derivatives* / Q000138:chemical synthesis* / Q000737:chemistry; D004951:Esterification; D007700:Kinetics; D012995:Solubility; D013431:Sulfates / Q000737:chemistry*; D014783:Viscosity
D000085:Acetates; D000089:Acetic Anhydrides; D013431:Sulfates; D002482:Cellulose