Cellulose nanoribbons obtained from bacterial fermentation have been esterified by means of a solventless organocatalytic route. The esterification methodology involves acetic anhydride as acylant and three different α-hydroxy acids were tested as organocatalysts. By tuning the acetylation interval, bacterial nanocellulose (BNC) with varying degree of substitution could be obtained (i.e. DS=0.27-0.90). Esterified BNC has been characterized in terms of its morphology, chemical structure, crystallinity, wettability and dispersibility in different solvents. The results indicate the efficacy of the present methodology for the smooth acetylation of cellulose nanoribbons at moderate conditions, thereby expanding the role of organocatalysts in reducing the hydrophilicity of bacterial cellulose nanoribbons.
Bibliographical noteFunding Information:
Authors acknowledge Consejo Nacional de Investiga-ciones Científicas y Técnicas (CONICET-PIP 1122011010 0608), University of Buenos Aires (UBACYT 2002009010 0065), and Agencia Nacional de Promoción Científica y Tecnológica for financial support (PICT 1957 2012 – PRESTAMO BID).
© 2016 Bentham Science Publishers.
- Bacterial nanocellulose
- α-hydroxy acids