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Physicochemical characterization of fractionated kraft lignins: Pre-symposium to the 9th ISWPC
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
1997 (English)Conference paper, (Other academic)
Abstract [en]

Kraft lignins are known to associate and form large clusters in aqueous solutions at pH values close to pKa. Some physicochemical properties related to association, such as the amount of free phenolic groups and hydrodynamic radius, have been determined in ultrafiltrated fractions of leached softwood kraft lignins and Indulin AT. Average diffusion coefficients were measured by the 1H PFG-NMR method in 2 % w/w lignin solutionsof 0.1 M LiOH/D2O. The hydrodynamic radius were calculated using the Stoke-Einstein expression. Conductometric titrations were used to determine the average amount of free phenolic groups in the fractions. The repulsive electrostatic potential, F0, originating from the phenolic charges, was calculated at different pH values for one of the fractions, using the Poisson-Boltzmann cell model.

Place, publisher, year, edition, pages
1997.
Keyword [en]
kraft lignin, phenolic groups, NMR self-diffusion, PB
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:miun:diva-4004Local ID: 1811OAI: oai:DiVA.org:miun-4004DiVA: diva2:29036
Available from: 2008-09-30 Created: 2008-09-30 Last updated: 2011-04-07Bibliographically approved

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