INSTITUTO DE TECNOLOGIA EN POLIMEROS Y NANOTECNOLOGIA
Unidad Ejecutora - UE
Simple citric acid-catalyzed surface esterification of cellulose nanocrystals
E. FORTUNATI; M.L. FORESTI; J.A. AVILA RAMÍREZ; L. TORRE; J.M. KENNY
ELSEVIER SCI LTD
Lugar: Amsterdam; Año: 2017 vol. 157 p. 1358 - 1364
A simple straightforward route for the surface esterification of cellulose nanocrystals (CNC) is hereinproposed. CNC obtained from microcrystalline cellulose were acetylated using as catalyst citric acid,a -hydroxy acid present in citrus fruits and industrially produced by certain molds in sucrose orglucose-containing medium. No additional solvent was added to the system; instead, the acylant (aceticanhydride) was used in sufficient excess to allow CNC dispersion and proper suspension agitation. By tun-ing the catalyst load, CNC with two different degree of substitution (i.e. DS = 0.18 and 0.34) were obtained.Acetylated cellulose nanocrystals were characterized in terms of chemical structure, crystallinity, mor-phology, thermal decomposition and dispersion in a non-polar solvent. Results illustrated for the firsttime the suitability of the protocol proposed for the simple surface acetylation of cellulose nanocrystals.