Cellulose

, Volume 21, Issue 6, pp 4471–4481 | Cite as

Dry jet-wet spinning of strong cellulose filaments from ionic liquid solution

  • Lauri K. J. Hauru
  • Michael Hummel
  • Anne Michud
  • Herbert Sixta
Original Paper

Abstract

Considerable growth is expected in the production of man-made cellulose textile fibers, which are commercially produced either via derivatization to form cellulose xanthate (viscose) or via direct dissolution in N-methylmorpholine N-oxide (Lyocell). In the study at hand, cellulosic fibers are spun from a solution in the ionic liquid [DBNH] [OAc] into water, resulting in properties equal or better than Lyocell (tensile strength 37 cN tex−1 or 550 MPa). Spinning stability is explored, and the effects of extrusion velocity, draw ratio, spinneret aspect ratio and bath temperature on mechanical properties and orientation are discussed. With the given set-up, tenacities and moduli are improved with higher draw ratios, while elongation at break, the ratio of wet to dry strength, modulus of resilience and birefringence depend little on draw ratio or extrusion velocity, elastic limit not at all. We find the process robust and simple, with stretching to a draw ratio of 5 effecting most improvement, explained by the orientation of amorphous domains along the fiber axis.

Keywords

Textile fibers Spinning Extrusion Regeneration Tenacity Modulus 

Notes

Acknowledgments

The authors wish to thank TEKES—the Finnish Funding Agency for Technology and Innovation and Finnish Bioeconomy Cluster FIBIC Ltd. for funding in the framework of the Future Biorefinery Cellulose project. Arno Parviainen synthesized the [DBNH] [OAc] with Dr. Alistair King and Prof. Ilkka Kilpeläinen (University of Helsinki). Dope samples were kindly provided by Shirin Asaadi. Kaarlo Nieminen assisted with MatLab and GPC was operated by Lasse Tolonen.

Supplementary material

10570_2014_414_MOESM1_ESM.pdf (770 kb)
Supplementary material 1 (PDF 769 kb)

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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  • Lauri K. J. Hauru
    • 1
  • Michael Hummel
    • 1
  • Anne Michud
    • 1
  • Herbert Sixta
    • 1
  1. 1.Department of Forest Products Technology, School of Chemical EngineeringAalto University, AaltoEspooFinland

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