Journal
CELLULOSE
Volume 28, Issue 3, Pages 1267-1281Publisher
SPRINGER
DOI: 10.1007/s10570-020-03621-9
Keywords
Cellulose; Dissolution; Reactivity; Raman spectroscopy; TEMPO-oxidation; UV/Vis-spectroscopy
Funding
- Association of the Forest Product Engineers
- FinnCERES Materials Bioeconomy Ecosystem
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Cellulose utilization often requires its dissolution in aqueous NaOH, but limitations such as low temperature and concentration are present. The addition of ZnO aids cellulose dissolution and prevents self-aggregation. This study proposed a new structure for cellulose dissolved in aqueous NaOH-ZnO based on Raman spectroscopic studies and TEMPO+-reactivities.
Cellulose utilization at its full potential often requires its dissolution which is challenging. Aqueous NaOH is the solvent of choice due to the rapid, non-toxic, low cost and environmentally friendly dissolution process. However, there are several limitations, such as the required low temperature and cellulose ' s moderately low degree of polymerization and concentration. Moreover, there is a tendency for gelation of semidilute solutions with time and temperature. The addition of ZnO aids cellulose dissolution and hinders self-aggregation in the NaOH solution; however, the exact role of ZnO has remained as an open question. In this work, we studied cellulose dissolution in the aqueous NaOH-ZnO system as well as the reactivity of the dissolved cellulose by oxidation with 4-AcNH-TEMPO+ (TEMPO+). Based on Raman spectroscopic studies and the TEMPO+-reactivities, we propose a new structure for cellulose dissolved in aqueous NaOH-ZnO. [GRAPHICS] .
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