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Selected Publication:

Russler, A; Wieland, M; Bacher, M; Henniges, U; Miethe, P; Liebner, F; Potthast, A; Rosenau, T.
(2012): AKD-Modification of bacterial cellulose aerogels in supercritical CO2
CELLULOSE. 2012; 19(4): 1337-1349. FullText FullText_BOKU

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.
Authors BOKU Wien:
Bacher Markus
Henniges Ute
Liebner Falk
Potthast Antje
Rosenau Thomas
BOKU Gendermonitor:


Find related publications in this database (Keywords)
Cellulose aerogel
Bacterial cellulose
Surface modification
Hydrophobization
Supercritical carbon dioxide
Alkyl ketene dimer (AKD)
AKD-CO2-oligomers
Humidity uptake


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