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Surface C6-carboxylated cellulose nanofibrils (TCNF-COONa) were prepared from wood cellulose by TEMPO/NaBr/NaClO oxidation in water at pH 10 and successive mechanical disintegration of the oxidized cellulose in water. Aqueous TCNF dispersions with magnesium and calcium carboxylate groups, TCNF-COOMg and TCNF-COOCa, respectively, were prepared in high yields of 85–90% from aqueous TCNF-COONa dispersion...
Regenerated cellulose‐saponite nanocomposite films were prepared from LiOH/urea solutions, and exhibited high optical transparency and flexibility. The saponite platelets formed intercalated nanolayered structures in the composites. The longitudinal directions of both the cellulose II crystallites and the saponite platelets were preferentially oriented parallel to the film surface in the composites...
Mechanical, thermal and oxygen barrier properties of regenerated cellulose films prepared from aqueous cellulose/alkali/urea solutions can be markedly improved by controlling the drying conditions of the films. By pre-pressing followed by vacuum drying under compression, the tensile strength, Young’s modulus, coefficient of thermal expansion and oxygen permeability of the dried films reached 263 MPa,...
TEMPO-oxidized cellulose nanofibers (TOCN) were obtained from commercial Norway spruce and mixed Eucalyptus cellulose pulps using TEMPO/sodium bromide (NaBr)/sodium hypochlorite (NaClO) system at pH 10 and 22 °C. After reaction, the fibrillated TEMPO-oxidized celluloses were used for preparation of self-standing films and casting of laminate films on 50 μm thick polyethylene terephthalate. Significant...
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