AKD-Modification of bacterial cellulose aerogels in supercritical CO2

作者：Russler Axel; Wieland Marcel; Bacher Markus; Henniges Ute; Miethe Peter; Liebner Falk; Potthast Antje; Rosenau Thomas^*

来源：Cellulose, 2012, 19(4): 1337-1349.

DOI：10.1007/s10570-012-9728-y

• Cellulose aerogel
• Bacterial cellulose
• Surface modification
• Hydrophobization
• Supercritical carbon dioxide
• Alkyl ketene dimer (AKD)
• AKD-CO2-oligomers
• Humidity uptake

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.

• 出版日期2012-8