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Dry, hydrophobic microfibrillated cellulose powder obtained in a simple procedure using alkyl ketene dimer
VerfasserYan, Yotao ; Amer, Hassan ; Rosenau, Thomas ; Zollfrank, Cordt ; Dörrstein, Jörg ; Jobst, Cornelia ; Zimmermann, Tanja ; Keckes, Jozef ; Veigel, Stefan ; Gindl-Altmutter, Wolfgang ; Li, Jianzhang
Erschienen in
Cellulose, Berlin, 2016, Jg. 23, H. 2, S. 1189-1197
ErschienenSpringer, 2016
SpracheEnglisch
DokumenttypAufsatz in einer Zeitschrift
Schlagwörter (EN)Microfibrillated cellulose / Alkyl ketene dimer / Surface modification / Hydrophobicity / Dry powder
ISSN1572-882X
URNurn:nbn:at:at-ubbw:3-1487 Persistent Identifier (URN)
DOI10.1007/s10570-016-0887-0 
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Dry, hydrophobic microfibrillated cellulose powder obtained in a simple procedure using alkyl ketene dimer [1.17 mb]
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In order to produce dry and hydrophobic microfibrillated cellulose (MFC) in a simple procedure, its modification with alkyl ketene dimer (AKD) was performed. For this purpose, MFC was solvent-exchanged to ethyl acetate and mixed with AKD dissolved in the same solvent. Curing at 130 C for 20 h under the catalysis of 1-methylimidazole yielded a dry powder. Scanning electron microscopy of the powder indicated loss in nanofibrillar structure due to aggregation, but discrete microfibrillar structures were still present. Water contact angle measurements of films produced from modified and unmodified MFC showed high hydrophobicity after AKD treatment, which persisted even after extraction with THF for 8 h. The hydrophobized MFC was characterized by Fourier transform infrared spectroscopy, nuclear magnetic resonance and X-ray analysis. In summary, strong indications for the presence of AKD on the surface of MFC before and after extraction with solvent were found, but only a very small amount of covalent -ketoester linkages between the modification agent and cellulose was revealed.