Cellulose dissolution in aqueous NaOH–ZnO : cellulose reactivity and the role of ZnO

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2021-02
Major/Subject
Mcode
Degree programme
Language
en
Pages
15
1267-1281
Series
Cellulose, Volume 28, issue 3
Abstract
Abstract: 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. Graphic abstract: [Figure not available: see fulltext.]
Description
Keywords
Cellulose, Dissolution, Raman spectroscopy, Reactivity, TEMPO-oxidation, UV/Vis-spectroscopy
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Citation
Väisänen, S, Ajdary, R, Altgen, M, Nieminen, K, Kesari, K K, Ruokolainen, J, Rojas, O J & Vuorinen, T 2021, ' Cellulose dissolution in aqueous NaOH–ZnO : cellulose reactivity and the role of ZnO ', Cellulose, vol. 28, no. 3, pp. 1267-1281 . https://doi.org/10.1007/s10570-020-03621-9