Conversion of wood-biopolymers into macrofibers with tunable surface energy via dry-jet wet-spinning
Journal article, 2018

Surface chemistry of regenerated all-wood-biopolymer fibers that are fine-tuned by composition of cellulose, lignin and xylan is elucidated via revealing their surface energy and adhesion. Xylan additive resulted in thin fibers and decreased surface energy of the fiber outer surfaces compared to the cellulose fibers, or when lignin was used as an additive. Lignin increased the water contact angle on the fiber surface and decreased adhesion force between the fiber cross section and a hydrophilic probe, confirming that lignin reduced fiber surface affinity to water. Lignin and xylan enabled fiber decoration with charged groups that could tune the adhesion force between the fiber and an AFM probe. The fibers swelled in water: the neat cellulose fiber cross section area increased 9.2%, the fibers with lignin as the main additive 9.1%, with xylan 6.8%, and the 3-component fibers 5.5%. This indicates that dimensional stability in elevated humidity is improved in the case of 3-component fiber compared to 2-component fibers. Xylan or lignin as an additive neither improved strength nor elongation at break. However, improved deformability was achieved when all the three components were incorporated into the fibers. Graphical Abstract: [Figure not available: see fulltext.].

Regenerated fibers

Fiber surface energy

Adhesion force mapping

Forest biomaterials



Tiina Nypelö

University of Natural Resources and Life Sciences

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Shirin Asaadi

Aalto University

Günther Kneidinger

University of Natural Resources and Life Sciences

Herbert Sixta

Aalto University

Johannes Konnerth

University of Natural Resources and Life Sciences


0969-0239 (ISSN)

Vol. 25 9 5297-5307

Subject Categories

Polymer Chemistry

Paper, Pulp and Fiber Technology

Polymer Technologies



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