期刊
CELLULOSE
卷 21, 期 3, 页码 1581-1589出版社
SPRINGER
DOI: 10.1007/s10570-014-0196-4
关键词
Cellulose nanofibril; Electric double-layer; Length determination; Shear viscosity; TEMPO
资金
- Japan Society for the Promotion of Science (JSPS) [21228007, 23688020, 201307645]
- Grants-in-Aid for Scientific Research [13J07645] Funding Source: KAKEN
The lengths of ten types of cellulose nanofibrils were evaluated by shear viscosity measurement of their dilute dispersions. Aqueous dispersions of surface-carboxylated cellulose nanofibrils with a uniform width of similar to 3 nm were prepared from wood cellulose by 2,2,6,6-tetramethylpiperidine-1-oxyl-mediated oxidation and successive mechanical treatment. Cellulose nanofibril samples with different average lengths were prepared by controlling the conditions of the oxidation or mechanical treatment. The viscosity-average lengths, L (visc), of the nanofibrils were calculated by applying the shear viscosities of the dilute dispersions to an equation for the dilute region flow behavior of rod-like polymer molecules. The obtained L (visc) values ranged from 1,100 to 2,500 nm and showed a linear relationship to the length-weighted average length, L (w), measured by microscopic observation; the relation was described as L (visc) = 1.764 x L (w) + 764. The influences of the electric double-layer of the nanofibrils and surface-carboxylate content on the value of L (visc) were also investigated.
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