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Cellulose

pp 1–9 | Cite as

Water-induced crystallization and nano-scale spinodal decomposition of cellulose in NMMO and ionic liquid dope

  • Yoshiharu Nishiyama
  • Shirin Asaadi
  • Patrik Ahvenainen
  • Herbert Sixta
Original Paper
  • 30 Downloads

Abstract

We followed the cellulose structure formation induced by water diffusion into Lyocell dopes based on both N-Methylmorpholine N-oxide (NMMO) and 1,5-diazabicyclo[4.3.0]non-5-ene acetate ([DBNH][OAc], by using scanning simultaneous small- and wide-angle scattering (SAXS-WAXS) experiment along the diffusion gradient. The water content at each point was estimated from the wide-angle scattering profile, giving a binary diffusion constant of the order of 5 × 10−10 m2/sec. In the case of the cellulose solution in NMMO monohydrate, diffraction peaks corresponding to cellulose II appeared concomitantly with the increase in small angle scattering features indicative of nanofibril formation. In the cellulose solution in the ionic liquid, an increase in small angle scattering intensity with the progression of water content appeared at scattering vector q = 0.015 Å−1 corresponding to a correlation length of about 40 nm, indicative of nanometric spinodal decomposition preceding the coagulation process, though no crystalline peak appeared in the wide-angle scattering.

Graphical Abstract

Keywords

SAXS-WAXS Dissolution Regeneration Coagulation Diffusion Ionic liquid 

Notes

Acknowledgments

We thank Dr. Isabelle Morfin, Dr. Nathalie Boudet and Dr. Nils Blanc for assistance at the D2AM beamline, and ESRF for providing beamtimes. PA has received funding from Kone Foundation.

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Copyright information

© Springer Nature B.V. 2018

Authors and Affiliations

  1. 1.University Grenoble Alpes, CNRS, CERMAVGrenobleFrance
  2. 2.Department of Bioproducts and BiosystemsAalto UniversityEspooFinland
  3. 3.Department of PhysicsUniversity of HelsinkiHelsinkiFinland

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