High-Performance Acetylated Ioncell-F Fibers with Low Degree of Substitution

Shirin Asaadi, Tia Kakko, Alistair W.T. King, Ilkka Kilpeläinen, Michael Hummel, Herbert Sixta

Research output: Contribution to journalArticleScientificpeer-review

27 Citations (Scopus)


Cellulose acetate is one of the most important cellulose derivatives. Herein we present a method to access cellulose acetate with a low degree of substitution through a homogeneous reaction in the ionic liquid 1,5-diazabicyclo[4.3.0]non-5-enium acetate ([DBNH][OAc]). This ionic liquid has also been identified as an excellent cellulose solvent for dry-jet wet fiber spinning. Cellulose was dissolved in [DBNH][OAc] and esterified in situ to be immediately spun into modified cellulose filaments with a degree of substitution (DS) value of 0.05-0.75. The structural properties of the resulting fibers, which are characterized by particularly high tensile strength values (525-750 MPa conditioned and 315-615 MPa wet) and elastic moduli between 10-26 GPa, were investigated by birefringence measurements, wide-angle X-ray scattering, and molar mass distribution techniques while their unique interactions with water have been studied through dynamic vapor sorption. Thus, an understanding of the novel process is gained, and the advantages are demonstrated for producing high-value products such as textiles, biocomposites, filters, and membranes.

Original languageEnglish
Pages (from-to)9418-9426
Number of pages9
JournalACS Sustainable Chemistry and Engineering
Issue number7
Publication statusPublished - 2 Jul 2018
MoE publication typeA1 Journal article-refereed


  • Cellulose
  • Cellulose acetate
  • Dry-jet wet spinning
  • Esterification
  • Ioncell-F
  • Man-made cellulosic fibers


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