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Revisiting the dissolution of cellulose in NaOH as "Seen" by X-rays
Lund University, Sweden.
Lund University, Sweden.
RISE Research Institutes of Sweden, Materials and Production, Chemistry, Biomaterials and Textiles.ORCID iD: 0000-0003-1259-6414
RISE Research Institutes of Sweden, Materials and Production, Chemistry, Biomaterials and Textiles.ORCID iD: 0000-0002-6498-7022
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2020 (English)In: Polymers, ISSN 2073-4360, E-ISSN 2073-4360, Vol. 12, no 2, article id 342Article in journal (Refereed) Published
Abstract [en]

Cotton production is reaching a global limit, leading to a growing demand for bio-based textile fibers produced by other means. Textile fibers based on regenerated cellulose from wood holds great potential, but in order to produce fibers, the components need to be dissolved in suitable solvents. Furthermore, the dissolution process of cellulose is not yet fully understood. In this study, we investigated the dissolution state of microcrystalline cellulose in aqueous NaOH by using primarily scattering methods. Contrary to previous findings, this study indicated that cellulose concentrations of up to 2 wt % are completely molecularly dissolved in 8 wt % NaOH. Scattering data furthermore revealed the presence of semi-flexible cylinders with stiff segments. In order to improve the dissolution capability of NaOH, the effects of different additives have been of interest. In this study, scattering data indicated that the addition of ZnO decreased the formation of aggregates, while the addition of PEG did not improve the dissolution properties significantly, although preliminary NMR data did suggest a weak attraction between PEG and cellulose. Overall, this study sheds further light on the dissolution of cellulose in NaOH and highlights the use of scattering methods to assess solvent quality. © 2020 by the authors.

Place, publisher, year, edition, pages
MDPI AG , 2020. Vol. 12, no 2, article id 342
Keywords [en]
Cellulose dissolution, Cold alkali (NaOH), Microcrystalline cellulose (MCC), Poly(ethylene glycole) (PEG), Small-angle X-ray-scattering (SAXS), Static light scattering (SLS), ZnO, Additives, Cellulose, Cultivation, Dissolution, Ethylene, II-VI semiconductors, Light scattering, Microcrystals, Sodium hydroxide, Textile fibers, Textiles, X ray scattering, Zinc oxide, Cellulose dissolutions, Cold alkali, Microcrystalline cellulose, Static Light Scattering, Wood
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-44450DOI: 10.3390/polym12020342Scopus ID: 2-s2.0-85080877580OAI: oai:DiVA.org:ri-44450DiVA, id: diva2:1415112
Note

Funding details: Energimyndigheten; Funding details: Svenska ForskningsrÃ¥det Formas; Funding details: Horizon 2020 Framework Programme, H2020, 654000; Funding details: VINNOVA; Funding details: National Science Foundation, NSF, DMR-0520547; Funding text 1: Thanks to M. S?dergren, P. Holmqvist and C. Ward for excellent technical assistance. We kindly acknowledge L. Gentile for fruitful scientific discussions, and S. Savino for preliminary work on MCC/PEG-NaOH. This work benefited from the use of the SasView application, originally developed under NSF Award DMR-0520547. SasView also contains code developed with funding from the EU Horizon 2020 programme under the SINE2020 project grant number 654000. This research has been supported by Treesearch.se. This research was funded by TreeToTextile AB and the strategic innovation programme BioInnovation financed by VINNOVA, The Swedish Energy Agency and The Swedish Research Council Formas.

Available from: 2020-03-17 Created: 2020-03-17 Last updated: 2020-03-17Bibliographically approved

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Köhnke, TobiasHedlund, Artur

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v. 2.35.10