Surface only modification of bacterial cellulose nanofibres with organic acids |
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| Authors: | Koon-Yang Lee Franck Quero Jonny J Blaker Callum A S Hill Stephen J Eichhorn Alexander Bismarck |
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| Institution: | (1) Polymer and Composite Engineering (PaCE) Group, Department of Chemical Engineering, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK;(2) Material Sciences Centre, School of Materials and the Northwest Composite Centre, University of Manchester, Grosvenor Street, Manchester, M1 7HS, UK;(3) Centre for Timber Engineering, Napier University, Merchiston Campus, 10 Colinton Road, Edinburgh, EH10 5DT, UK;; |
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| Abstract: | Bacterial cellulose (BC) nanofibres were modified only on their surface using an esterification reaction with acetic acid,
hexanoic acid or dodecanoic acid. This reaction rendered the extremely hydrophilic surfaces of BC nanofibres hydrophobic.
The hydrophobicity of BC increased with increasing carbon chain length of the organic acids used for the esterification reaction.
Streaming (zeta-) potential measurements showed a slight shift in the isoelectric point and a decrease in ζplateau was also observed after the esterification reactions. This was attributed to the loss of acidic functional groups and increase
in hydrophobicity due to esterification of BC with organic acids. A method based on hydrogen/deuterium exchange was developed
to evaluate the availability of surface hydroxyl groups of neat and modified BC. The thermal degradation temperature of modified
BC sheets decreased with increasing carbon chain length of the organic acids used. This is thought to be a direct result of
the esterification reaction, which significantly reduces the packing efficiency of the nanofibres because of a reduction in
the number of effective hydrogen bonds between them. |
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