Morphology and swelling of thin films of dialcohol xylan
Journal article, 2023

Polysaccharides are excellent network formers and are often processed into films from water solutions. Despite being hydrophilic polysaccharides, the typical xylans liberated from wood are sparsely soluble in water. We have previously suggested that an additional piece to the solubilization puzzle is modification of the xylan backbone via oxidative cleavage of the saccharide ring. Here, we demonstrate the influence of the degree of modification, i.e., degree of oxidation (DO) on xylan solubilization and consequent film formation and stability. Oxidized and reduced wood xylans (i.e., dialcohol xylans) with the highest DO (77 %) within the series exhibited the smallest hydrodynamic diameter (dh) of 60 nm in dimethylsulfoxide (DMSO). We transferred the modified xylans into films credit to their established solubility and then quantified the film water interactions. Dialcohol xylans with intermediate DOs (42 and 63 %) did not form continuous films. The films swelled slightly when subjected to humidity. However, the film with the highest DO demonstrated a significant moisture uptake that depended on the film mass and was not observed with the other modified grades or with unmodified xylan.

Water interactions

Solubilization

Quartz crystal microbalance with dissipation monitoring

Author

Chonnipa Palasingh

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Rupert Kargl

Technische Universität Graz

University of Maribor

Karin Stana Kleinschek

Technische Universität Graz

University of Maribor

Jana B. Schaubeder

Technische Universität Graz

Stefan Spirk

Technische Universität Graz

Anna Ström

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Tiina Nypelö

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Carbohydrate Polymers

0144-8617 (ISSN)

Vol. 313 120810

Oxiderad hemicellulosa för filmer och geler

Swedish Research Council (VR) (2017-05138), 2018-01-01 -- 2021-12-31.

Subject Categories

Polymer Chemistry

Paper, Pulp and Fiber Technology

Polymer Technologies

DOI

10.1016/j.carbpol.2023.120810

PubMed

37182942

More information

Latest update

5/3/2023 3