Journal
CARBOHYDRATE POLYMERS
Volume 157, Issue -, Pages 1358-1364Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2016.11.008
Keywords
Cellulose nanocrystals; Chemical modification; Surface acetylation; Citric acid
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Funding
- Consejo Nacional de Investigaciones Cientificas y Tecnicas [CONICET- PIP 1122011010 0608]
- Universidad de Buenos Aires [UBACYT 20020120100336BA]
- Agencia Nacional de Promotion Cientifica y Tecnologica [PICT 1957 2012-PRESTAMO BID]
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A simple straightforward route for the surface esterification of cellulose nanocrystals (CNC) is herein proposed. CNC obtained from microcrystalline cellulose were acetylated using as catalyst citric acid, a a-hydroxy acid present in citrus fruits and industrially produced by certain molds in sucrose or glucose-containing medium. No additional solvent was added to the system; instead, the acylant (acetic anhydride) was used in sufficient excess to allow CNC dispersion and proper suspension agitation. By tuning 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, morphology, thermal decomposition and dispersion in a non-polar solvent. Results illustrated for the first time the suitability of the protocol proposed for the simple surface acetylation of cellulose nanocrystals. (C) 2016 Elsevier Ltd. All rights reserved.
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