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Thermodynamics of the Water-Retaining Properties of Cellulose-Based Networks
KTH Royal Institute of Technology, Sweden.
RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy. KTH Royal Institute of Technology, Sweden.
Uppsala University, Sweden.
KTH Royal Institute of Technology, Sweden.
2019 (English)In: Biomacromolecules, ISSN 1525-7797, E-ISSN 1526-4602, Vol. 20, no 4, p. 1603-1612Article in journal (Refereed) Published
Abstract [en]

Noncrystalline cellulose-based gel beads were used as a model material to investigate the effect of osmotic stress on a cellulosic network. The gel beads were exposed to osmotic stress by immersion in solutions with different concentrations of high molecular mass dextran and the equilibrium dimensional change of the gel beads was studied using optical microscopy. The volume fraction of cellulose was calculated from the volume of the gel beads in dextran solutions and their dry content and the relation between the cellulose volume fraction and the total osmotic pressure was thus obtained. The results show that the contribution to the osmotic pressure from counterions increases the water-retaining capacity of the beads at high osmotic pressures but also that the main factor controlling the gel bead collapse at high osmotic strains is the resistance to the deformation of the polymer chain network within the beads. Furthermore, the osmotic pressure associated with the deformation of the polymer network, which counteracts the deswelling of the beads, could be fitted to the Wall model indicating that the response of the cellulose polymer networks was independent of the charge of the cellulose. The best fit to the Wall model was obtained when the Flory-Huggins interaction parameter (χ) of the cellulose-water system was set to 0.55-0.60, in agreement with the well-established insolubility of high molecular mass β-(1,4)-d-glucan polymers in water.

Place, publisher, year, edition, pages
American Chemical Society , 2019. Vol. 20, no 4, p. 1603-1612
Keywords [en]
Cellulose, Deformation, Dextran, Molecular mass, Volume fraction, Cellulose polymers, Dextran solutions, Dimensional changes, Flory-Huggins interaction parameter, High molecular mass, Noncrystalline cellulose, Polymer networks, Water retaining, Osmosis
National Category
Polymer Technologies Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:ri:diva-38249DOI: 10.1021/acs.biomac.8b01791Scopus ID: 2-s2.0-85063128803OAI: oai:DiVA.org:ri-38249DiVA, id: diva2:1300907
Funder
Knut and Alice Wallenberg FoundationAvailable from: 2019-04-01 Created: 2019-04-01 Last updated: 2019-07-01Bibliographically approved

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