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Published in: Cellulose 4/2012

01-08-2012 | Original Paper

AKD-Modification of bacterial cellulose aerogels in supercritical CO2

Authors: Axel Russler, Marcel Wieland, Markus Bacher, Ute Henniges, Peter Miethe, Falk Liebner, Antje Potthast, Thomas Rosenau

Published in: Cellulose | Issue 4/2012

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Abstract

Different approaches towards hydrophobic modification of bacterial cellulose aerogels with the alkyl ketene dimer (AKD) reagent are presented. If AKD modification was performed in supercritical CO2, an unexpectedly high degree of loading was observed. About 15 % of the AKD was bound covalently to the cellulose matrix, while the other part consisted of re-extractable AKD-carbonate oligomers, which are novel chemical structures described for the first time. These oligomers contain up to six AKD and CO2 moieties linked by enolcarbonate structures. The humidity uptake from environments with different relative humidity by samples equipped with up to 30 % AKD is strongly reduced, as expected due to the hydrophobization effect. Samples above 30 % AKD, and especially at very high loading between 100 and 250 %, showed the peculiar effect of increased humidity uptake which even exceeded the value of unmodified bacterial cellulose aerogels.

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Metadata
Title
AKD-Modification of bacterial cellulose aerogels in supercritical CO2
Authors
Axel Russler
Marcel Wieland
Markus Bacher
Ute Henniges
Peter Miethe
Falk Liebner
Antje Potthast
Thomas Rosenau
Publication date
01-08-2012
Publisher
Springer Netherlands
Published in
Cellulose / Issue 4/2012
Print ISSN: 0969-0239
Electronic ISSN: 1572-882X
DOI
https://doi.org/10.1007/s10570-012-9728-y

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