Spinning Cellulose Hollow Fibers Using 1-Ethyl-3-methylimidazolium Acetate–Dimethylsulfoxide Co-Solvent

Lei, Linfeng; Lindbråthen, Arne; Sandru, Marius; Gutierrez, Maria Teresa Guzman; Zhang, Xiangping; Hillestad, Magne; He, Xuezhong

doi:10.3390/polym10090972

Cited by 28 publications

(16 citation statements)

References 34 publications

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“…As previously reported, the viscosity of the spinning dopes has a significant influence on the spinning process, and most of cellulose composite fibers were prepared by dry spray wet spinning with the concentration of spinning dope 8–12%. − The concentration of spinning dope is 10% here, so that the viscosity of the spinning dope is not too high to ensure that the spinning can be carried out smoothly. The details of the preparation of MF/cellulose flame-retardant fibers are as follows: pre-MF and cellulose (polymerization degree: 550, mass ratio: 2:1) were dissolved in EmimDEP to form spinning dopes with solid content 10% at 70 °C.…”

Section: Resultsmentioning

confidence: 99%

Screening Ionic Liquids for Dissolving a Melamine Formaldehyde Resin Prepolymer to Fabricate Flame-Retardant Fibers

Chen

Sun

et al. 2020

ACS Sustainable Chem. Eng.

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The melamine fiber has been widely used because of its excellent flame retardancy. We tried to fabricate melamine fibers using ionic liquids (ILs) as solvents, melamine formaldehyde resin prepolymer (pre-MF) as flameretardant material, and cellulose as the supporter. The best ILs for dissolving water-insoluble pre-MF were screened by COSMO-RS, in view of the richness of ILs and the complexity of pre-MF. The logarithmic activity coefficients (ln γ) of three models were calculated to evaluate the dissolution ability of pre-MF in 432 ILs. According to the results of ln γ and excess enthalpies, anions play a leading role in the dissolution process of pre-MF in ILs, while cations have little effect on it. The solubility experiments of pre-MF in 8 ILs were determined, which are consistent with the trend of ln γ predicted. It is important that the ILs composed of OAc

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Section: Resultsmentioning

confidence: 99%

Screening Ionic Liquids for Dissolving a Melamine Formaldehyde Resin Prepolymer to Fabricate Flame-Retardant Fibers

Chen

Sun

et al. 2020

ACS Sustainable Chem. Eng.

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“…Lei et al [83] used a microcrystalline cellulose (MCC) precursor to spun hollow fibers through a dry-wet spinning method, with a dope solution of 10 wt% of MCC with a co-solvent of 75 wt% EmimAc/25 wt% DMSO and a bore solution containing 20 wt% water/60 wt% EmimAc/20 wt% DMSO. From thermogravimetric analysis they concluded that produced MCC hollow fibers presented a pyrolysis behavior similar to deacetylated cellulose acetate.…”

Section: Selection Of Cellulosic Precursormentioning

confidence: 99%

“…The cellulose acetate precursor used by some authors has an average acetyl content of 40% [31,[76][77][78][79][80][81][82][83][84][85][86][87][88][89][90][91][92]. The direct carbonization of cellulose acetate membranes can form defects on the carbon matrix or even turn it into dust [31].…”

Section: Effect Of the Pre-treatmentsmentioning

confidence: 99%

Cellulose-Based Carbon Molecular Sieve Membranes for Gas Separation: A Review

2020

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In the field of gas separation and purification, membrane technologies compete with conventional purification processes on the basis of technical, economic and environmental factors. In this context, there is a growing interest in the development of carbon molecular sieve membranes (CMSM) due to their higher permeability and selectivity and higher stability in corrosive and high temperature environments. However, the industrial use of CMSM has been thus far hindered mostly by their relative instability in the presence of water vapor, present in a large number of process streams, as well as by the high cost of polymeric precursors such as polyimide. In this context, cellulosic precursors appear as very promising alternatives, especially targeting the production of CMSM for the separation of O2/N2 and CO2/CH4. For these two gas separations, cellulose-based CMSM have demonstrated performances well above the Robeson upper bound and above the performance of CMSM based on other polymeric precursors. Furthermore, cellulose is an inexpensive bio-renewable feed-stock highly abundant on Earth. This article reviews the major fabrication aspects of cellulose-based CMSM. Additionally, this article suggests a new tool to characterize the membrane performance, the Robeson Index. The Robeson Index, θ, is the ratio between the actual selectivity at the Robeson plot and the corresponding selectivity—for the same permeability—of the Robeson upper bound; the Robeson Index measures how far the actual point is from the upper bound.

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“…Membranes utilizing ionic liquid as a solvent have been shown to perform in the ultrafiltration or nanofiltration regimes. This same ionic liquid approach was used to spin cellulose hollow fibers [12]. Cellulose membranes prepared using ionic liquid have been shown to be highly selective for organic dyes, rejecting 94% of Bromothymol Blue [13].…”

Section: Introductionmentioning

confidence: 99%

Composite Membranes Derived from Cellulose and Lignin Sulfonate for Selective Separations and Antifouling Aspects

et al. 2019

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Cellulose-based membrane materials allow for separations in both aqueous solutions and organic solvents. The addition of nanocomposites into cellulose structure is facilitated through steric interaction and strong hydrogen bonding with the hydroxy groups present within cellulose. An ionic liquid, 1-ethyl-3-methylimidazolium acetate, was used as a solvent for microcrystalline cellulose to incorporate graphene oxide quantum dots into cellulose membranes. In this work, other composite materials such as, iron oxide nanoparticles, polyacrylic acid, and lignin sulfonate have all been uniformly incorporated into cellulose membranes utilizing ionic liquid cosolvents. Integration of iron into cellulose membranes resulted in high selectivity (>99%) of neutral red and methylene blue model dyes separation over salts with a high permeability of 17 LMH/bar. With non-aqueous (alcohol) solvent, iron–cellulose composite membranes become less selective and more permeable, suggesting the interaction of iron ions cellulose OH groups plays a major role in pore structure. Polyacrylic acid was integrated into cellulose membranes to add pH responsive behavior and capacity for metal ion capture. Calcium capture of 55 mg Ca2+/g membrane was observed for PAA-cellulose membranes. Lignin sulfonate was also incorporated into cellulose membranes to add strong negative charge and a steric barrier to enhance antifouling behavior. Lignin sulfonate was also functionalized on the commercial DOW NF270 nanofiltration membranes via esterification of hydroxy groups with carboxyl group present on the membrane surface. Antifouling behavior was observed for both lignin-cellulose composite and commercial membranes functionalized with lignin. Up to 90% recovery of water flux after repeated cycles of fouling was observed for both types of lignin functionalized membranes while flux recovery of up to 60% was observed for unmodified membranes.

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Spinning Cellulose Hollow Fibers Using 1-Ethyl-3-methylimidazolium Acetate–Dimethylsulfoxide Co-Solvent

Cited by 28 publications

References 34 publications

Screening Ionic Liquids for Dissolving a Melamine Formaldehyde Resin Prepolymer to Fabricate Flame-Retardant Fibers

Screening Ionic Liquids for Dissolving a Melamine Formaldehyde Resin Prepolymer to Fabricate Flame-Retardant Fibers

Cellulose-Based Carbon Molecular Sieve Membranes for Gas Separation: A Review

Composite Membranes Derived from Cellulose and Lignin Sulfonate for Selective Separations and Antifouling Aspects

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