Abstract
This study investigated the effects of carboxyl content and mechanical treatment intensity on the morphological characteristics of carboxymethylated cellulose nanofibrils (CM CNFs) and on the rheological properties of CM CNF suspension. The mechanical properties of self-standing CM CNF film were also examined. CM CNFs produced under different conditions had similar, uniform widths of about 5 nm, as measured using transmission electron microscope images and Image J software. The aspect ratios of three CM CNFs were evaluated using gel point analysis and the crowding number theory. Higher carboxyl content in the CM CNFs reduced the amount of mechanical energy required and increased the aspect ratio. The rheological properties and the tensile properties of CNF film were all strongly influenced by the aspect ratio of the CM CNFs. The CM CNF samples with higher aspect ratios produced stronger suspension network structures and had greater tensile properties.
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This work was supported by the Technological Innovation Program funded by the Ministry of Trade, Industry & Energy (10062717).
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Im, W., Rajabi Abhari, A., Youn, H.J. et al. Morphological characteristics of carboxymethylated cellulose nanofibrils: the effect of carboxyl content. Cellulose 25, 5781–5789 (2018). https://doi.org/10.1007/s10570-018-1993-y
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DOI: https://doi.org/10.1007/s10570-018-1993-y