期刊
CELLULOSE
卷 18, 期 2, 页码 421-431出版社
SPRINGER
DOI: 10.1007/s10570-010-9484-9
关键词
Electro-mediated oxidation; TEMPO; 4-acetamido-TEMPO; Cellulose nanofibril; Carboxyl
资金
- Japan Society for the Promotion of Science (JSPS) [21228007, 20-6499]
- Grants-in-Aid for Scientific Research [21228007] Funding Source: KAKEN
A softwood bleached kraft pulp (SBKP) was subjected to electro-mediated oxidation in water with TEMPO or 4-acetamido-TEMPO without any chlorine-containing oxidant. Solid recovery ratios of water-insoluble fractions of the oxidized SBKPs were more than 80%, and C6-carboxylate contents increased up to approximately 1 mmol g(-1) after oxidation for 48 h. Significant amounts of C6-aldehyde groups (0.17-0.38 mmol g(-1)) were also formed in the oxidized SBKPs. The degree of polymerization decreased from 2,200 to 520 and 1,400 by the oxidation for 48 h with TEMPO at pH 10 and 4-acetamido-TEMPO at pH 6.8, respectively. The original cellulose I crystal structure and crystallinity of SBKP were maintained after the oxidation, indicating that all C6-oxidized groups were selectively formed on crystalline cellulose microfibril surfaces. The oxidized SBKPs with carboxylate contents of more than 0.9 mmol g(-1) were convertible to individual cellulose nanofibrils in yields of more than 80% by disintegration in water.
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