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

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http://hdl.handle.net/10138/301158

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Asaadi , S , Kakko , T , King , A W T , Kilpeläinen , I , Hummel , M & Sixta , H 2018 , ' High-Performance Acetylated Ioncell‑F Fibers with Low Degree of Substitution ' , ACS Sustainable Chemistry & Engineering , vol. 6 , no. 7 , pp. 9418–9426 . https://doi.org/10.1021/acssuschemeng.8b01768

Title: High-Performance Acetylated Ioncell‑F Fibers with Low Degree of Substitution
Author: Asaadi, Shirin; Kakko, Tia; King, Alistair W. T.; Kilpeläinen, Ilkka; Hummel, Michael; Sixta, Herbert
Contributor: University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
University of Helsinki, Synthesis and Analysis
Date: 2018-07
Language: eng
Number of pages: 17
Belongs to series: ACS Sustainable Chemistry & Engineering
ISSN: 2168-0485
URI: http://hdl.handle.net/10138/301158
Abstract: 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.
Subject: 116 Chemical sciences
Cellulose
Esterification
Cellulose acetate
Dry-jet wet spinning
Man-made cellulosic fibers
Ioncell-F
REGENERATED CELLULOSE FIBERS
IONIC LIQUIDS
HOMOGENEOUS ACETYLATION
MOISTURE SORPTION
FINE-STRUCTURE
ACETATE
WATER
DISSOLUTION
RHEOLOGY
ESTERS
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