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Cellulose

, Volume 19, Issue 4, pp 1337–1349 | Cite as

AKD-Modification of bacterial cellulose aerogels in supercritical CO2

  • Axel Russler
  • Marcel Wieland
  • Markus Bacher
  • Ute Henniges
  • Peter Miethe
  • Falk Liebner
  • Antje Potthast
  • Thomas Rosenau
Original Paper

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.

Keywords

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

Notes

Acknowledgments

We would like to thank the Austrian Christian-Doppler-Society, Vienna and the FZMB GmbH, Bad Langensalza, Germany, for financial support within the “Christian Doppler Laboratory for Advanced Cellulose Chemistry and Analytics” and Walter Klug for recording the SEM pictures.

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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • Axel Russler
    • 1
  • Marcel Wieland
    • 1
  • Markus Bacher
    • 1
  • Ute Henniges
    • 1
  • Peter Miethe
    • 2
  • Falk Liebner
    • 1
  • Antje Potthast
    • 1
  • Thomas Rosenau
    • 1
  1. 1.Christian Doppler Laboratory for Advanced Cellulose Chemistry and AnalyticsUniversity of Natural Resources and Life Sciences ViennaViennaAustria
  2. 2.FZMB GmbH Forschungszentrum für Medizintechnik und BiotechnologieBad LangensalzaGermany

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