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- Title
Effect of coexisting salt on TEMPO-mediated oxidation of wood cellulose for preparation of nanocellulose.
- Authors
Inamochi, Toru; Funahashi, Ryunosuke; Nakamura, Yasutaka; Saito, Tsuguyuki; Isogai, Akira
- Abstract
The influence of coexisting salt in 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-mediated oxidation of wood cellulose in water at pH 10 for 100 min was investigated, in which NaSO was partly used in place of NaBr in the conventional TEMPO/NaBr/NaClO oxidation system. The amount of NaBr could be reduced from 1 to 0.2 mmol/g-wood cellulose by adding 0.4 mmol/g NaSO. This introduced a carboxylate content of ~1.2 mmol/g, which is sufficient to prepare TEMPO-oxidized cellulose nanofibrils (TOCNs) by mechanical disintegration of the oxidized cellulose in water. When no NaBr was used and NaSO, NaSO, NaCl or CHCOONa was instead used as a coexisting salt in TEMPO/NaClO oxidation, the oxidized celluloses had carboxylate contents of 0.6-0.8 mmol/g, which are insufficient to prepare TOCNs with nanofibrillation yields >55%. The viscosity-average degrees of polymerization of the resulting TEMPO-oxidized celluloses were in the range 420-450, indicating that depolymerization of cellulose is not governed by the carboxylate content of the TEMPO-oxidized cellulose but rather by the oxidation time.
- Subjects
CELLULOSE; OXIDATION; CARBOXYLATES; VISCOSITY; POLYMERIZATION
- Publication
Cellulose, 2017, Vol 24, Issue 9, p4097
- ISSN
0969-0239
- Publication type
Article
- DOI
10.1007/s10570-017-1402-y