期刊
CARBOHYDRATE POLYMERS
卷 153, 期 -, 页码 686-695出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2016.08.009
关键词
Bacterial cellulose; Acetylation; Citric acid; Reaction conditions
资金
- Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET) [PIP 1122011010 0608]
- Agencia Nacional de Promocion Cientifica y Tecnologica [PICT 1957 2012-PRESTAMO BID]
Bacterial cellulose (BC) nanoribbons were partially acetylated by a simple direct solvent-free route catalyzed by citric acid. The assay of reaction conditions within chosen intervals (i.e. esterification time (0.5-7h), catalyst content (0.08-1.01 mmol/mmol AGU), and temperature (90-140 degrees C)), illustrated the flexibility of the methodology proposed, with reaction variables which can be conveniently manipulated to acetylate BC to the required degree of substitution (DS) within the 0.20-0.73 interval. Within this DS interval, characterization results indicated a surface-only process in which acetylated bacterial cellulose with tunable DS, preserved fibrous structure and increased hydrophobicity could be easily obtained. The feasibility of reusing the catalyst/excess acylant in view of potential scale-up was also illustrated. (C) 2016 Elsevier Ltd. All rights reserved.
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