Characterization of the regenerated cellulose films in ionic liquids and rheological properties of the solutions

Liu, Zhen; Wang, Hui; Li, Zengxi; Lü, Xingmei; Zhang, Xiangping; Zhang, Suojiang; Zhou, Kebin

doi:10.1016/j.matchemphys.2011.02.062

Cited by 133 publications

(63 citation statements)

References 30 publications

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“…The physical pretreatment can either be a milling or grinding process that involves the breakdown of biomass size and reduction on the degree of crystallinity of lignocellulosic material. Meanwhile, the pretreatment process that involves liquid water under high temperature and pressure is referred to in various terms, such as autohydrolysis, hydrothermal treatment, hot compressed water (HCW), hydrothermolysis, LHW, aquasolve processing, aqueous processing, and pressure-cooking in water (Liu et al 2011). The LHW pretreatment involves the addition of water at elevated temperatures and high pressures.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Liquid Hot Water Cotton Linter to Prepare Cellulose Membrane using NaOH/Urea or LiOH/Urea

Gan¹,

Padzil²,

Zakaria³

et al. 2015

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The liquid hot water (LHW) pretreatment on cotton linter (CL) was carried out using an autoclave heated in a hot oil bath. The LHW pretreated CL (LCL) was dissolved in NaOH/urea and LiOH/urea aqueous solutions and subsequently used to produce cellulose membrane. The effects of LHW pretreatment, amount of cellulose, and type of alkaline solvent on properties of cellulose solution and cellulose membrane were studied.The formation of cellulose II and crystallinity index (CrI) on the cellulose membranes were confirmed by X-ray diffraction (XRD). The morphology of cellulose membranes were observed by field emission scanning electron microscopy (FESEM). The LHW pretreatment resulted in higher cellulose solubility, higher cellulose solution viscosity, and improved properties of regenerated cellulose products compared to non-treated cellulose. Results also revealed that the amount of cellulose used affected the solubility and viscosity of the cellulose solution and the higher dissolving power of the LiOH/urea system as compared to the NaOH/urea system. In fact, higher solubility and viscosity properties are key factors in many cellulose applications such as membranes, fibers, hydrogels, and other regenerated cellulose products.

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Section: Introductionmentioning

confidence: 99%

Synthesis of Liquid Hot Water Cotton Linter to Prepare Cellulose Membrane using NaOH/Urea or LiOH/Urea

Gan¹,

Padzil²,

Zakaria³

et al. 2015

BioResources

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“…The cosolvent is thus used as the bulk in the solvent system, and the IL is used as an additive that adjusts the solvent properties just enough to allow dissolution over merely swelling. MIM as an additive in small amounts has been studied in solutions of BMIMCl and cellulose and was found to drastically reduce DP loss in cotton pulp, and the authors describe a hypothesis of cellulose/BMIMCl/MIM interaction where MIM withdraws some of the chloride ions from the cellulose, thereby inhibiting chain scission [26]. MIM directly facilitates certain reactions and may be successfully used as a cosolvent or additive in derivatization [21,27].…”

Section: Introductionmentioning

confidence: 99%

Effect of methylimidazole on cellulose/ionic liquid solutions and regenerated material therefrom

et al. 2014

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Cellulose, especially wood-based cellulose, is increasingly important for making everyday materials such as man-made-regenerated textile fibers, produced via dissolution and subsequent precipitation. In this paper, the effect of cosolvents in ionic liquid-facilitated cellulose dissolution is discussed. Both microcrystalline cellulose and dissolving grade hardwood pulp were studied. Three different cosolvents in combination with ionic liquid were evaluated using turbidity measurements and viscosity. The ionic liquid precursor N-methylimidazole proved to be a promising cosolvent candidate and was thus selected for further studies together with the ionic liquid 1-ethyl-3-methylimidazolium acetate. Results show that dissolution rate can be increased by cosolvent addition, and the viscosity can be significantly reduced. The solutions were stable over time at room temperature and could be converted to regenerated textile fibers with good mechanical properties via airgap spinning and traditional wet spinning.Fibers spun from binary solvents exhibited significantly higher crystallinity than the fibers from neat ionic liquid.

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“…Because of their almost negligible vapor pressure, they present a great thermochemical stability. However, most of the research on the treatment of biomass in an ionic liquid medium is aimed at dissolving crystalline cellulose (Kadokawa et al 2009;Liu et al 2011;Kuang et al 2008;Lin et al 2009;Hua et al 2009 ;Zhao et al, 2009), not on the forest biomass, which is a more complex matter. In their research, Sang et al (2009) show that an ionic liquid can dissolve wood cellulose and lignin.…”

Section: Introductionmentioning

confidence: 99%

New Ionic Liquid for the Dissolution of Lignin

et al. 2013

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This work aims to develop a new ionic liquid, used as an aprotic green ä solvent, to dissolve kraft lignin from black liquor. The kraft lignin was extracted through precipitation with carbon dioxide at atmospheric pressure. 1,.0]undec-7-ene-based ionic liquids were obtained by quaternization of the nitrogen atom with a hydrogen atom or an alkyl chain. The yields of the synthesis of the ionic liquids varied between 76 and 80%. Dissolving experiments were carried out using the lignin isolated from the black liquor of a kraft process. Up to 20% (w/w) of the lignin can be dissolved in butyl-1,8 . The time it takes to dissolve the lignin in these three liquids shows that its solubility is influenced mostly by the nature of the cations. The lignin solubility was reduced in relation to the increased length of the grafted carbon chain. The thermogravimetric analysis (TGA) showed these liquids can be used as lignin solvents from room temperature up to 300 °C (onset of degradation). Steric exclusion chromatography showed a slight decrease (6%) in the molecular weight of the lignin dissolved in these ionic liquids.

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Characterization of the regenerated cellulose films in ionic liquids and rheological properties of the solutions

Cited by 133 publications

References 30 publications

Synthesis of Liquid Hot Water Cotton Linter to Prepare Cellulose Membrane using NaOH/Urea or LiOH/Urea

Synthesis of Liquid Hot Water Cotton Linter to Prepare Cellulose Membrane using NaOH/Urea or LiOH/Urea

Effect of methylimidazole on cellulose/ionic liquid solutions and regenerated material therefrom

New Ionic Liquid for the Dissolution of Lignin

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