Oxidized xylan additive for nanocellulose films – A swelling modifier
Journal article, 2021

Polymeric wood hemicelluloses are depicted to join cellulose, starch and chitosan as key polysaccharides for sustainable materials engineering. However, the approaches to incorporate hemicelluloses in emerging bio-based products are challenged by lack of specific benefit, other than the biomass-origin, although their utilization would contribute to sustainable material use since they currently are a side stream that is not valorized. Here we demonstrate wood-xylans as swelling modifiers for neutral and charged nanocellulose films that have already entered the sustainable packaging applications, however, suffer from humidity sensitivity. The oxidative modification is used to modulate the water-solubility of xylan and hence enable adsorption in an aqueous environment. A high molecular weight grade, hence less water-soluble, adsorbed preferentially on the neutral surface while the adsorbed amount on a negatively charged surface was independent of the molecular weight, and hence, solubility. The adsorption of the oxidized xylans on a neutral cellulose surface resulted in an increase in the amount of water in the film while on the negatively charged cellulose the total amount of water decreased. The finding of synergy of two hygroscopic materials to decrease swelling in hydrophilic bio-polymer films demonstrates the oxidized macromolecule xylan as structurally functional component in emerging cellulose products.

Sustainable engineering

Wood components

Renewable materials

Author

Chonnipa Palasingh

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Anna Ström

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Anna Ström Group

Hassan Amer

National Research Centre

University of Natural Resources and Life Sciences

Tiina Nypelö

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Wallenberg Wood Science Center (WWSC)

International Journal of Biological Macromolecules

0141-8130 (ISSN)

Vol. 180 753-759

Oxiderad hemicellulosa för filmer och geler

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

Subject Categories

Biochemistry and Molecular Biology

Analytical Chemistry

Materials Chemistry

Infrastructure

Chalmers Materials Analysis Laboratory

Areas of Advance

Materials Science

DOI

10.1016/j.ijbiomac.2021.03.062

PubMed

33727189

More information

Latest update

5/3/2021 1