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Susceptibility of never-dried and freeze-dried bacterial cellulose towards esterification with organic acid

Lee, K-Y; Bismarck, A; (2012) Susceptibility of never-dried and freeze-dried bacterial cellulose towards esterification with organic acid. Cellulose , 19 (3) 891 - 900. 10.1007/s10570-012-9680-x. Green open access

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Abstract

The susceptibility of (1) never-dried and (2) freeze-dried bacterial cellulose (BC) towards organic acid esterification is reported in this work. When never-dried BC (BC which was solvent exchanged from water through methanol into pyridine) was modified with hexanoic acid, it was found that the degree of substitution (DS) was significantly lower than that of hexanoic acid modified freeze-dried BC. The crystallinity of freeze-dried BC hexanoate was found to be significantly lower compared to neat BC and never-dried BC hexanoate. This result, along with the high DS indicates that significant bulk modification occurred during the esterification of freeze-dried BC. Such results were not observed for never-dried BC hexanoate. All these evidence point towards to fact that freeze-dried BC was more susceptible to organic acid esterification compared to never-dried BC. A few hypotheses were explored to explain the observed behaviour and further investigated to elucidate our observation; the effect of residual water in cellulose, the accessibility of hydroxyl groups and the crystal structure of never-dried and freeze-dried BC on the susceptibility of cellulose fibrils to esterification, respectively. However, the investigation of these hypotheses raised more questions and we are still left with the main question; why do BC nanofibres behave differently when modifying freeze-dried BC or never-dried BC?

Type: Article
Title: Susceptibility of never-dried and freeze-dried bacterial cellulose towards esterification with organic acid
Open access status: An open access version is available from UCL Discovery
DOI: 10.1007/s10570-012-9680-x
Publisher version: http://dx.doi.org/10.1007/s10570-012-9680-x
Language: English
Additional information: This is the author's accepted manuscript of this article.
Keywords: Esterification, Organic acids, Bacterial cellulose, Freeze-dried state, Never-dried state
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering
URI: http://discovery.ucl.ac.uk/id/eprint/1407453
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