TEMPO-oxidized cellulose nanofiber films: effect of surface morphology on water resistance
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2,2,6,6-Tetramethylpiperidine-1-oxyl radical (TEMPO)-oxidized cellulose nanofibers were prepared from two kraft pulps (Norway spruce and mixed eucalyptus) using the TEMPO/NaBr/NaClO system at pH 10 and 22 °C. After reaction and mechanical treatment, the TEMPO-oxidized celluloses were used for preparation of self-standing films and coatings of laminate films on 50-μm-thick polyethylene terephthalate films. Characterization of the films was performed based on water contact angle measurements, laser profilometry, scanning electron microscopy, and field-emission scanning electron microscopy. The purpose of this study is to understand how the measured contact angles are affected by the film’s physical properties (morphology, thickness, density, and roughness).
KeywordsTEMPO-oxidized cellulose nanofibers Films Surface morphology Thickness Contact angle
The authors would like to thank Per Olav Johnsen for acquisition of FESEM images, Professor Torbjørn Helle for linguistic help, and project partners in the SustainBarrier project at PFI for financial support.
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