Thermal Stability of Lyocell Solutions: Experimental Results and Modeling Using Cluster Analysis and Partial Least Squares Regression

Wendler, Frank; Kolbe, Axel; Kraft, Jörg; Einax, Jürgen W.; Heinze, Thomas

doi:10.1002/mats.200700049

Cited by 6 publications

(3 citation statements)

References 10 publications

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“…The Lyocell process is considered to be a more environmentally friendly option than the viscose process because NMMO hydrates are non-toxic to the environment [96]. However, the NMMO also has limited thermal stability, due to which a variety of additional by-products may appear [97,98].…”

Section: Non-aqueous Solventsmentioning

confidence: 99%

Fabricating Sustainable All-Cellulose Composites

2021

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Climate change, waste disposal challenges, and emissions generated by the manufacture of non-renewable materials are driving forces behind the production of more sustainable composite materials. All-cellulose composites (ACCs) originate from renewable biomass, such as trees and other plants, and are considered fully biodegradable. Dissolving cellulose is a common part of manufacturing ACCs, and currently there is a lot of research focused on effective, but also more environmentally friendly cellulose solvents. There are several beneficial properties of ACC materials that make them competitive: light weight, recyclability, low toxicity, good optical, mechanical, and gas barrier properties, and abundance of renewable plant-based raw material. The most prominent ACC applications are currently found in the food packing, medical, technical and vehicle industries. All-cellulose nanocomposites (ACNCs) expand the current research field and can offer a variety of more specific and functional applications. This review provides an overview of the manufacture of sustainable ACCs from lignocellulose, purified cellulose, and cellulosic textiles. There is an introduction of the cellulose dissolution practices of creating ACCs that are currently researched, the structure of cellulose during complete or partial dissolution is discussed, and a brief overview of factors which influence composite properties is presented.

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Section: Non-aqueous Solventsmentioning

confidence: 99%

Fabricating Sustainable All-Cellulose Composites

2021

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“…NMMO easily decomposes into N‐methylmorpholine (NMM), morpholine (M), formaldehyde and other by‐products in acidic environments; metal ions and high temperatures affect the production safety, solvent recovery and fibre quality 13‐15 . Research conducted by Wendler et al shows that some additives with high surface activity, acid groups or trace metal elements adversely affect the thermal stability of lyocell solution and reduce the effect of conventional stabilisers 16‐19 . A majority of previous studies have focused on the characterisation and mechanism of NMMO decomposition in the presence of reactive additives.…”

Section: Introductionmentioning

confidence: 99%

Influence of carbon black with different polar groups on the solvent N‐methylmorpholine N‐oxide

Jin

Kumi

Cui

et al. 2021

Coloration Technology

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To confirm the effect of the surface property of carbon black (CB) on the lyocell process and the chemical stability of the solvent N‐methylmorpholine N‐oxide (NMMO), molecular dynamics simulation and ultraviolet tests were performed to investigate the interaction between aqueous NMMO solution and CB surfaces with different polar groups. The hydrophobic interaction between the O2 atom of NMMO and the unmodified CB surface increased with an increase in NMMO concentration. The interaction improved the dispersion of CB in aqueous NMMO solution, but this effect was not sufficient to prevent the aggregation between CB particles. Modifying the CB surface with a 1%‐3% carboxyl or amino group produced a stronger electrostatic interaction between the polar groups and the solvent molecules; however, the carboxyl group had a significant influence on the chemical stability of NMMO. The amino group can realise the stable dispersion of CB in aqueous NMMO solutions without affecting the chemical stability of NMMO, which would be the best choice for preparation of functional lyocell fibre.

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“…Radical decomposition/degradation, deoxygenation, and the Polonovski reaction are the main side reactions 24. The dissolution process of cellulose in NMMO also has some disadvantages with regard to chemical alterations involving decomposition/degradation reactions of NMMO and cellulose, and this requires a major investment in safety technology 25–28…”

Section: Introductionmentioning

confidence: 99%

Comparison of direct solvents for regenerated cellulosic fibers via the lyocell process and by means of ionic liquids

Ingildeev

Effenberger

Bredereck

et al. 2012

J of Applied Polymer Sci

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Because new technology using ionic liquids (ILs) for cellulose processing enables the spinning of cellulose with various techniques, the resulting fiber property profiles differ significantly, depending on the process parameters. ILs are thermally stable, nontoxic, environmentally friendly solvents and dissolve cellulose directly; this leads to a high flexibility in the complete process chain for man‐made cellulosics. A comparison of the manufacture of cellulosic fibers according to the Lyocell process and by means of ILs is presented. The rheological behavior of the spinning dopes, the structures, and the physical textile properties of the prepared fibers were determined. The fibers spun from solutions of cellulose in N‐methyl morpholin‐N‐oxide monohydrate, 1‐ethyl‐3‐methyl imidazolium acetate, and 1‐ethyl‐3‐methyl imidazolium diethyl phosphate were compared. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

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Thermal Stability of Lyocell Solutions: Experimental Results and Modeling Using Cluster Analysis and Partial Least Squares Regression

Cited by 6 publications

References 10 publications

Fabricating Sustainable All-Cellulose Composites

Fabricating Sustainable All-Cellulose Composites

Influence of carbon black with different polar groups on the solvent N‐methylmorpholine N‐oxide

Comparison of direct solvents for regenerated cellulosic fibers via the lyocell process and by means of ionic liquids

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