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Pulp delignification and refining: impact on the supramolecular structure of softwood fibers
RISE Research Institutes of Sweden, Bioeconomy and Health, Pulp, Paper and Packaging.ORCID iD: 0000-0002-0816-0047
RISE Research Institutes of Sweden, Bioeconomy and Health, Pulp, Paper and Packaging. KTH Royal Institute of Technology, Sweden.ORCID iD: 0000-0002-8992-3623
RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.ORCID iD: 0000-0002-1341-0266
RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.ORCID iD: 0000-0001-9176-7116
2023 (English)In: Cellulose, ISSN 0969-0239, E-ISSN 1572-882X, Vol. 30, no 16, p. 10453-10468Article in journal (Refereed) Published
Abstract [en]

The effect on softwood fiber wall nanostructure of kraft cooking, oxygen delignification and refining was evaluated by X-ray scattering. A recently developed simulation method for modelling small angle X-ray scattering (SAXS) data was used to estimate the apparent average sizes of solids (AAPS) and interstitial spaces in the fiber wall (AACS). Fiber saturation point and wide angle X-ray scattering were also used to calculate the pore volume in the fiber wall and the crystallite size of the fibril, respectively. The experimental modelled SAXS data was able to give consistent values for each kraft-cooked and oxygen-delignified pulp. Kraft delignification seems to have the major influence on the fiber nanostructure modification, while oxygen delignification has little or no significant impact even for different kappa numbers. The particle sizes values were more stable than the cavities sizes and no significant differences were seen between different delignification processes, refining or delignification degree. Pulps evaluated after PFI-refining, showed an increase in the fiber wall porosity evaluated by FSP and an increase in the interstitial spaces in the fiber wall, while the crystallite size and the particle sizes were very little or not affected at all. 

Place, publisher, year, edition, pages
Springer Science and Business Media B.V. , 2023. Vol. 30, no 16, p. 10453-10468
Keywords [en]
Delignification; Fibers; Kraft Papers; Oxygen; Particle Size; Refining; Softwoods; Walls; Crystallite size; Fibers; Nanostructures; Oxygen; Particle size; Pulp refining; Softwoods; X ray scattering; Fiber wall; FSP; Interstitial space; Kraft cooking; Oxygen delignifications; Particles sizes; Scattering data; Small angle X-ray scattering; Softwood fibers; WAXS; Delignification
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-67940DOI: 10.1007/s10570-023-05490-4Scopus ID: 2-s2.0-85171308873OAI: oai:DiVA.org:ri-67940DiVA, id: diva2:1814671
Note

Open access funding provided by RISE Research Institutes of Sweden. ‘Stiftelsen Nils och Dorthi Troëdssons forskningsfond’ are gratefully acknowledged for funding; application 1039/2021.

Available from: 2023-11-27 Created: 2023-11-27 Last updated: 2023-11-27Bibliographically approved

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Esteves, ClaudiaBrännvall, ElisabetStevanic Srndovic, JasnaLarsson, Per Tomas

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