Cellulose Dissolution and Processing with Ionic Liquids

Vagt, Uwe

doi:10.1002/9783527628698.hgc064

Cited by 4 publications

(6 citation statements)

References 15 publications

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“…The authors studied the stability and spinnability of different commercial dissolving pulps dissolved in [bmim]Cl 2a and [amim]Cl 3a. All solutions were spun according to the NMMO-based Lyocell technique, that is, in a dry-jet wet spinning process where the liquid filament first passes through an air gap before immersion in the coagulation bath where the solid cellulosic fibers are formed [68]. Gel permeation chromatography (GPC) analyses revealed that ILs 2a and 3a degrade the cellulosic solute substantially at 90 and 80 C, respectively.…”

Section: Fiber Spinningmentioning

confidence: 99%

Ionic Liquids for the Production of Man-Made Cellulosic Fibers: Opportunities and Challenges

Hummel

Michud

Tanttu

et al. 2015

Advances in Polymer Science

132

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The constant worldwide increase in consumption of goods will also affect the textile market. The demand for cellulosic textile fibers is predicted to increase at such a rate that by 2030 there will be a considerable shortage, estimated at~15 million tons annually. Currently, man-made cellulosic fibers are produced commercially via the viscose and Lyocell™ processes. Ionic liquids (ILs) have been proposed as alternative solvents to circumvent certain problems associated with these existing processes. We first provide a comprehensive review of the progress in fiber spinning based on ILs over the last decade. A summary of the reports on the preparation of pure cellulosic and composite fibers is complemented by an overview of the rheological characteristics and thermal degradation of cellulose-IL solutions. In the second part, we present a non-imidazolium-based ionic liquid, 1,5-diazabicyclo[4.3.0]non-5-enium acetate, as an excellent solvent for cellulose fiber spinning. The use of moderate process temperatures in this process avoids the otherwise extensive cellulose degradation. The structural and morphological properties of the spun fibers are described, as determined by WAXS, birefringence, and SEM measurements. Mechanical properties are also reported. Further, the suitability of the spun fibers to produce yarns for various textile applications is discussed.

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Section: Fiber Spinningmentioning

confidence: 99%

Ionic Liquids for the Production of Man-Made Cellulosic Fibers: Opportunities and Challenges

Hummel

Michud

Tanttu

et al. 2015

Advances in Polymer Science

132

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“…The liquid fibers pass through the air gap and then are immersed in a coagulation bath to obtain RCFs. [ 56,57 ]…”

Section: Non‐derivative Organic Solvent Systemsmentioning

confidence: 99%

Recent Progress in Regenerated Cellulose Fibers by Wet Spinning

Shen

Sun

Zhou

2023

Macro Materials & Eng

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Cellulose is the most abundant and “green” biomass resource on earth and gains tremendous attention. It is expected to become an alternative for traditional chemical and petroleum resources. This review describes the traditional solvents used for industrial processes, the non‐derivative organic solvents, and the aqueous solution systems, along with their dissolution mechanisms and development of fiber‐spinning processes. The problems associated with the industrial production of viscose fibers and cuprammonium fibers are also discussed. This paper focuses on the research status of regenerated cellulose fibers (RCFs) prepared with green and no‐pollution aqueous solutions and provides some effective strategies and methods for improving the mechanical strength of RCFs and promoting the implementation of industrial production. Lastly, the current developments of RCFs are summarized and prospected and it would serve as a guide for the developmental trend and research direction of RCFs in the future.

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“…For instance, a solvent with a linear shape can penetrate porogen pores, while a solvent with a branched shape has significantly hindered diffusion into the pores. 96 The solvent's ease of availability, chemical/thermal stability, biocompatibility, low vapour pressure, low melting point, low specific heat, non-corrosiveness, and low viscosity and density are also important considerations depending on the application. 43,96 A solvent with high chain mobility and weak interaction with gas molecules will lead to high diffusion coefficients, which will enable rapid mass transport of gas molecules.…”

Section: Type Imentioning

confidence: 99%

“…96 The solvent's ease of availability, chemical/thermal stability, biocompatibility, low vapour pressure, low melting point, low specific heat, non-corrosiveness, and low viscosity and density are also important considerations depending on the application. 43,96 A solvent with high chain mobility and weak interaction with gas molecules will lead to high diffusion coefficients, which will enable rapid mass transport of gas molecules. 57 Attention must also be paid to solve viscosity, such that the final PL has low viscosity to facilitate both mass transport and handling.…”

Section: Type Imentioning

confidence: 99%