Superbase-based protic ionic liquids for cellulose filament spinning
- PDF / 1,727,572 Bytes
- 15 Pages / 547.087 x 737.008 pts Page_size
- 81 Downloads / 177 Views
(0123456789().,-volV) ( 01234567 89().,-volV)
ORIGINAL RESEARCH
Superbase-based protic ionic liquids for cellulose filament spinning Sherif Elsayed . Michael Hummel . Daisuke Sawada . Chamseddine Guizani . Marja Rissanen . Herbert Sixta
Received: 14 July 2020 / Accepted: 1 October 2020 Ó The Author(s) 2020
Abstract Lyocell fibers have received increased attention during the recent years. This is due to their high potential to satisfy the rising market demand for cellulose-based textiles in a sustainable way. Typically, this technology adopts a dry-jet wet spinning process, which offers regenerated cellulose fibers of excellent mechanical properties. Compared to the widely exploited viscose process, the lyocell technology fosters an eco-friendly process employing green direct solvents that can be fully recovered with low environmental impact. N-methylmorpholine N-oxide
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10570-020-03505-y) contains supplementary material, which is available to authorized users. S. Elsayed M. Hummel D. Sawada C. Guizani M. Rissanen H. Sixta (&) Department of Bioproducts and Biosystems, Aalto University, P.O. Box 16300, 00076 Aalto, Finland e-mail: [email protected] S. Elsayed e-mail: [email protected]
(NMMO) is a widely known direct solvent that has proven its success in commercializing the lyocell process. Its regenerated cellulose fibers exhibit higher tenacities and chain orientation compared to viscose fibers. Recently, protic superbase-based ionic liquids (ILs) have also been found to be suitable solvents for lyocell-type fiber spinning. Similar to NMMO, fibers of high mechanical properties can be spun from the cellulose-IL solutions at lower spinning temperatures. In this article, we study the different aspects of producing regenerated cellulose fibers using NMMO and relevant superbase-based ILs. The selected ILs are 1,5-diazabicyclo[4.3.0]non-5-ene-1-ium acetate ([DBNH]OAc), 7-methyl-1,5,7-triazabicyclo[4.4.0] dec-5-enium acetate ([mTBDH]OAc) and 1,8-diazabicyclo[5.4.0]undec-7-enium acetate ([DBUH]OAc). All ILs were used to dissolve a 13 wt% (PHK) cellulose pulp. The study covers the fiber spinning process, including the rheological characterization of the various cellulose solutions. Moreover, we discuss the properties of the produced fibers such as mechanical performance, macromolecular properties and morphology.
M. Hummel e-mail: [email protected] D. Sawada e-mail: [email protected] C. Guizani e-mail: [email protected] M. Rissanen e-mail: [email protected]
123
Cellulose
Graphic abstract
Keywords Lyocell Regenerated fibers MMCFs Ionic liquids Cellulose dissolution Ioncell
Introduction Cellulosic fibers long dominated the man-made fiber market until the synthetic fiber production surpassed cellulosics in the late 1960s (The Fiber Year 2013). Ever since, the man-made cellulose fibers have been in the shadow of polyesters, polyamides and acrylics. However, more and
Data Loading...
