Structural analysis of Ioncell-F fibres from birch wood

Asaadi, Shirin; Hummel, Michael; Ahvenainen, Patrik; Gubitosi, Marta; Olsson, Ulf; Sixta, Herbert

doi:10.1016/j.carbpol.2017.11.062

Cited by 45 publications

(58 citation statements)

References 37 publications

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“…According to our previous studies on the structure of Ioncell-F fibers without modification, the amorphous orientation is very sensitive toward the draw ratio in particular at lower draw ratios. However, the crystalline orientation varies only a little upon changes in the DR. 25 , 58 This was also observed for the acetylated Ioncell-F in this study ( Figure S3 ). These results are in line with the decrease of the crystallinity and also the decrease in crystallite sizes.…”

Section: Results and Discussionsupporting

confidence: 85%

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

Asaadi

Kakko

King

et al. 2018

ACS Sustainable Chem. Eng.

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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.

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Section: Results and Discussionsupporting

confidence: 85%

“…It showed that the increase of orientation causes a decrease in water-accessible surface area of the fibers. 58 …”

Section: Results and Discussionmentioning

confidence: 99%

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

Asaadi

Kakko

King

et al. 2018

ACS Sustainable Chem. Eng.

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“…46 Depending on the crystallinity index calculation method adopted, the degree of crystallinity of MCC (50% or 78%) is either higher than or equal to IC (46%-52%). 30,34 However, in this study, the shades obtained were darker with MCC than IC, which may have been due to the dyeing conditions and the differing appearance of the samples. The IC fibres were rather shiny, whereas the MCC samples had a smaller reflecting surface.…”

Section: Dyeing Of Cellulosic Materialscontrasting

confidence: 56%

Biomordanting willow bark dye on cellulosic materials

Lohtander

Arola

Laaksonen

2019

Coloration Technology

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A semi-quantitative study of willow bark dye adsorption on two different cellulose materials using biomordants was carried out. The studied celluloses were microcrystalline cellulose (MCC) AaltoCell and regenerated Ioncell-F (IC) fibres. The dye was a hot water extract of willow bark and the adsorption to cellulose was carried out using carboxylic acid-containing biomordants, namely, oxalic acid, citric acid and tannic acid. Alum was employed as the reference mordant.A semi-quantitative estimation of the dye uptake was conducted using high-performance liquid chromatography equipped with a diode array detector and also by visual inspection, as well as an evaluation of the coloration using CIELab parameters. The mechanism of the dye adsorption on the cellulose surfaces was studied via Fourier Transform-infrared spectroscopy. According to the results, MCC had a higher affinity for polyphenolic dye than the regenerated cellulose fibres.Dye uptake on MCC was 50%-80% and 44%-57% on IC. For MCC, the biomordants improved the dye uptake more effectively than the control mordant, alum, whereas for IC the biomordants were less effective than alum.Päivi Laaksonen works as a principal research scientist at Häme University of Applied Sciences and leads a research team on long term durability of materials. She holds a M.Sc. (2005) and doctoral degree on physical chemistry and since the dissertation at Helsinki University of Technology (2008) she has worked as a senior scientist at VTT Technical Research Centre of Finland and as an assistant professor of materials science at Aalto University, Finland. Laaksonen has studied a wide range of self-assembling nanomaterials including, for instance, metal nanoparticles and biological macromolecules. Currently her interests are applications of biobased materials in technical and textile materials.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. AbstractA semi-quantitative study of willow bark dye adsorption on two different cellulose materials using biomordants was carried out. The studied celluloses were microcrystalline cellulose (MCC) AaltoCell and regenerated Ioncell-F (IC) fibres. The dye was a hot water extract of willow bark and the adsorption to cellulose was carried out using carboxylic acid-containing biomordants, namely, oxalic acid, citric acid and tannic acid. Alum was employed as the reference mordant. A semi-quantitative

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“…[DBNH] [OAc] has been shown to be an efficient solvent for dissolving birch-based cellulose [13] and is considered to be a promising industrial solvent due to its safety, low environmental impact, economic viability, and production of high-quality fiber even from low-refined unbleached pulps [14][15][16][17] with good spinnability [18]. Nevertheless, the main challenge to the wider application of IL is that it can be a relatively expensive organic solvent and, therefore, it must be efficiently recycled from aqueous solution as a way to reduce costs [19].…”

Section: Introductionmentioning

confidence: 99%

Freeze Concentration of Aqueous [DBNH][OAc] Ionic Liquid Solution

et al. 2020

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In the present work, freeze crystallization studies, as a novel concentration method for aqueous 1,5-diazabicyclo[4.3.0]non-5-enium acetate ([DBNH][OAc]) ionic liquid solution, were conducted. In order to find the appropriate temperature and composition range for freeze crystallization, the solid–liquid equilibrium of a binary [DBNH][OAc]–water compound system was investigated with differential scanning calorimetry (DSC). Results of this analysis showed that the melting temperature of the pure ionic liquid was 58 ℃, whereas the eutectic temperature of the binary compound system was found to be −73 ℃. The activity coefficient of water was determined based on the freezing point depression data obtained in this study. In this study, the lowest freezing point was −1.28 ℃ for the aqueous 6 wt.% [DBNH][OAc] solution. Ice crystal yield and distribution coefficient were obtained for two types of aqueous solutions (3 wt.% and 6 wt.% [DBNH][OAc]), and two freezing times (40 min and 60 min) were used as the main parameters to compare the two melt crystallization methods: static layer freeze and suspension freeze crystallization. Single-step suspension freeze crystallization resulted in higher ice crystal yields and higher ice purities when compared with the single-step static layer freeze crystallization. The distribution coefficient values obtained showed that the impurity ratios in ice and in the initial solution for suspension freeze crystallization were between 0.11 and 0.36, whereas for static layer freeze crystallization these were between 0.28 and 0.46. Consequently, suspension freeze crystallization is a more efficient low-energy separation method than layer freeze crystallization for the aqueous-ionic liquid solutions studied and, therefore, this technique can be applied as a concentration method for aqueous-ionic liquid solutions.

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Structural analysis of Ioncell-F fibres from birch wood

Cited by 45 publications

References 37 publications

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

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

Biomordanting willow bark dye on cellulosic materials

Freeze Concentration of Aqueous [DBNH][OAc] Ionic Liquid Solution

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