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

Research output: Contribution to journalArticleScientificpeer-review

Researchers

  • Tiina Nypelö
  • Shirin Asaadi
  • Günther Kneidinger
  • Herbert Sixta

  • Johannes Konnerth

Research units

  • Chalmers University of Technology
  • University of Natural Resources and Life Sciences, Vienna

Abstract

Abstract: 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.]

Details

Original languageEnglish
Pages (from-to)5297–5307
Number of pages11
JournalCellulose
Volume25
Issue number9
Publication statusPublished - 2018
MoE publication typeA1 Journal article-refereed

    Research areas

  • Adhesion force mapping, Fiber surface energy, Forest biomaterials, Regenerated fibers, Wood-biopolymers

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