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Thermodynamics of the Water-Retaining Properties of Cellulose-Based Networks
KTH Royal Inst Technol, Wallenberg Wood Sci Ctr, Dept Fiber & Polymer Technol, Teknikringen 56, S-10044 Stockholm, Sweden.
KTH Royal Inst Technol, Wallenberg Wood Sci Ctr, Dept Fiber & Polymer Technol, Teknikringen 56, S-10044 Stockholm, Sweden;RISE Bioecon, Box 5604, S-11486 Stockholm, Sweden.
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Pharmacy, Department of Pharmacy.ORCID iD: 0000-0002-0895-1180
KTH Royal Inst Technol, Wallenberg Wood Sci Ctr, Dept Fiber & Polymer Technol, Teknikringen 56, S-10044 Stockholm, Sweden;KTH Royal Inst Technol, Div Fibre Technol, Dept Fiber & Polymer Technol, Teknikringen 56, S-10044 Stockholm, 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 (chi) of the cellulose-water system was set to 0.55-0.60, in agreement with the well-established insolubility of high molecular mass beta-(1,4)-D-glucan polymers in water.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2019. Vol. 20, no 4, p. 1603-1612
National Category
Physical Chemistry Polymer Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-382568DOI: 10.1021/acs.biomac.8b01791ISI: 000464248300013PubMedID: 30817883OAI: oai:DiVA.org:uu-382568DiVA, id: diva2:1307414
Funder
Knut and Alice Wallenberg FoundationAvailable from: 2019-04-26 Created: 2019-04-26 Last updated: 2019-04-26Bibliographically approved

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