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Changes in the cellulose fiber wall supramolecular structure during the initial stages of chemical treatments of wood evaluated by NMR and X-ray scattering
RISE Research Institutes of Sweden, Bioeconomy and Health, Pulp, Paper and Packaging.ORCID iD: 0000-0002-8992-3623
RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.
RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.ORCID iD: 0000-0002-1341-0266
2021 (English)In: Cellulose, ISSN 0969-0239, E-ISSN 1572-882X, Vol. 28, p. 3951-3965Article in journal (Refereed) Published
Abstract [en]

The effect of initial stages of pulping of spruce, resembling prehydrolysis and alkaline cooking was studied using CP/MAS 13C-NMR, X-ray scattering, FSP and carbohydrate composition in order to study the impact of the pre-treatments on the fiber wall nanostructure. Removal of fiber wall components, hemicellulose and lignin, increased the fiber wall porosity and induced cellulose fibril aggregation. The effect of temperature and pH in the treatment on cellulose fibril aggregate size appears to be secondary. It is the removal of hemicellulose that has a profound effect on the supramolecular structure of the cellulose fiber wall. As the amount of hemicellulose dissolved from wood increases, the fibril aggregate size determined by NMR increases as well, ranging from 16 to 28 nm. Specifically, a good correlation between the amount of glucomannan in the fiber wall and the fibril aggregate size is seen. The lower the amount of glucomannan, the larger the aggregate size. Glucomannan thus seems to prevent aggregation as it acts as a very efficient spacer between fibrils. Elemental fibril size determined by NMR, was quite similar for all samples, ranging from 3.6 to 4.1 nm. By combining measurement methods, a more well-resolved picture of the structural changes occurring during was obtained. © 2021, The Author(s).

Place, publisher, year, edition, pages
Springer Science and Business Media B.V. , 2021. Vol. 28, p. 3951-3965
Keywords [en]
Fiber wall porosity, Fibril aggregation, FSP, Hemicellulose, Lignin, Aggregates, Alkalinity, Cellulose, Nanostructures, Pulp cooking, Supramolecular chemistry, Textile fibers, X ray scattering, Alkaline cooking, Carbohydrate compositions, Cellulose fibrils, Chemical treatments, Effect of temperature, Good correlations, Measurement methods, Supramolecular structure, Wood
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:ri:diva-52610DOI: 10.1007/s10570-021-03790-1Scopus ID: 2-s2.0-85102297443OAI: oai:DiVA.org:ri-52610DiVA, id: diva2:1538303
Available from: 2021-03-18 Created: 2021-03-18 Last updated: 2023-05-22Bibliographically approved

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Brännvall, ElisabetStevanic Srndovic, Jasna

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