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Physico-Chemical Characterization of a Fractionated Kraft Lignin
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.ORCID iD: 0000-0003-3407-7973
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
Responsible organisation
2000 (English)In: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434X, Vol. 54, no 5, 528-534 p.Article in journal (Refereed) Published
Abstract [en]

A kraft lignin was leached from a softwood pulp and fractionated by ultrafiltration. The fractions were characterized in respect to phenolic group content, molecular weight distributions and self-diffusion coefficients. The 1H-Pulsed Field Gradient (PFG) NMR self-diffusion measurements and the High-Pressure Size Exclusion Chromatography (HPSEC) analysis of the fractions, were seen to correlate fairly well. From the self-diffusion measurements, the mass-weighted median hydrodynamic radii of the diffusants in the fractions, were calculated assuming spherical fragments. Furthermore, the content of phenolic groups in the fractions, was found to decrease by increasing hydrodynamic radius and molecular weight, but the calculated median surface charge densities of the macromolecules, were determined to be constant in the range of oligomers up to at least 65 structural units.

Place, publisher, year, edition, pages
2000. Vol. 54, no 5, 528-534 p.
Keyword [en]
kraft lignin, self-diffusion, distribution curves, phenolic groups, ultrafiltration
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:miun:diva-1861DOI: 10.1515/HF.2000.089ISI: 000089643300015Scopus ID: 2-s2.0-0034578799Local ID: 652OAI: oai:DiVA.org:miun-1861DiVA: diva2:26893
Available from: 2008-09-30 Created: 2008-09-30 Last updated: 2016-10-11Bibliographically approved

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