Rapid Dissolution of Cellulose in Ionic Liquid with Different Methods

Lan, Wu; Liu, Chuanfu; Yue, Fengxia; Sun, Run‐Cang

doi:10.5772/52517

Cited by 7 publications

(5 citation statements)

References 34 publications

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“…Some ILs are capable of breaking the hydrogen bonds of cellulose's extensive fibrillated structure without derivatization (Swatloski et al, 2002). Acidic ILs have been used to dissolve microcrystalline cellulose (Ding et al, 2012), wood and sawdust (Wang et al, 2010), and sugarcane (Lan et al, 2013). However, only some ILs can dissolve cellulose.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Ionic liquids as solvents for making composite materials from cellulose

Elhi¹,

Aid²,

Koel³

2016

Proc. Estonian Acad. Sci.

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Some imidazolium-based ionic liquids (ILs) are able to dissolve microcrystalline cellulose to form 10 wt% solutions. This allows easy production of cellulose composite materials by mixing the respective solutions. The purpose of this work was to make an environmentally friendly novel material using cellulose as a binder to be an alternative for classical binders in electrically conductive materials. Eleven ILs were used to dissolve cellulose. The ILs included two ILs previously untested for this application. Monofilaments composed of three types of cellulose and carbon aerogels were prepared. Solutions of cellulose and carbon aerogels were made into electrically conducting materials. Regeneration of cellulose and composites from ILs was performed using water, ethanol, and acetone. From those antisolvents water proved to be the most effective. The solutions were made into films and fibre extrusions. The used ILs were successfully recovered and reused after regeneration of cellulose. This further strengthened the belief that dissolving cellulose with ionic liquids is a 'green process'.

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Section: Introductionmentioning

confidence: 99%

“…presented. Methods of dissolving cellulose in ILs vary including the following conditions: magnetic stirring with heating, conventional heating, ethanol treatment, mechanical milling (Lan et al, 2013). Also, the purity of ILs (especially their water content) is an important parameter.…”

Section: Introductionmentioning

confidence: 99%

Ionic liquids as solvents for making composite materials from cellulose

Elhi¹,

Aid²,

Koel³

2016

Proc. Estonian Acad. Sci.

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“…Additionally, it can be suggested that pretreatment with DES in combination with ultrasound better dissolves the amorphous parts of the cellulose due to increased penetration of DES into the cellulose and the improved mass transfer [ 86 , 87 ]. As a result, it is likely that the stronger cellulose residues remain, and that it is due to these parts that the stronger and stiffer samples are formed.…”

Section: Resultsmentioning

confidence: 99%

Strengthening Cellulose Nanopaper via Deep Eutectic Solvent and Ultrasound-Induced Surface Disordering of Nanofibers

et al. 2021

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The route for the preparation of cellulose nanofiber dispersions from bacterial cellulose using ethylene glycol- or glycerol-based deep eutectic solvents (DES) is demonstrated. Choline chloride was used as a hydrogen bond acceptor and the effect of the combined influence of DES treatment and ultrasound on the thermal and mechanical properties of bacterial cellulose nanofibers (BC-NFs) is demonstrated. It was found that the maximal Young’s modulus (9.2 GPa) is achieved for samples prepared using a combination of ethylene glycol-based DES and ultrasound treatment. Samples prepared with glycerol-based DES combined with ultrasound exhibit the maximal strength (132 MPa). Results on the mechanical properties are discussed based on the structural investigations that were performed using FTIR, Raman, WAXD, SEM and AFM measurements, as well as the determination of the degree of polymerization and the density of BC-NF packing during drying with the formation of paper. We propose that the disordering of the BC-NF surface structure along with the preservation of high crystallinity bulk are the key factors leading to the improved mechanical and thermal characteristics of prepared BC-NF-based papers.

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“…For example, the maximum of OH region was shifted from around 3450 cm -1 to a higher wave number (3520 cm -1 ). (Lan et al 2013) In addition, the peak associated to the cellulose I (the peaks at 1107, 1161 and 1430 cm -1 related to ring asymmetric stretching, C-O-C asymmetric stretching, and CH2 symmetric bending vibration) (Yang et al 2017) disappeared after dissolution and regeneration, further indicating the no natural cellulose I allomorph is presented in cellulose regenerated from TEAOHcarbamate solution.…”

Section: Analysis Of Regenerated Cellulosementioning

confidence: 99%

Room-temperature dissolution and chemical modification of cellulose in aqueous tetraethylammonium hydroxide–carbamide solutions

Sirviö

Heiskanen

2019

Cellulose

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The room-temperature dissolution of cellulose in aqueous tetraethylammonium hydroxide (TEAOH) in the presence of carbamides (ureas) was investigated. Without carbamide, 35 wt% TEAOH was able to dissolve cellulose (microcrystalline cellulose) up to 3 wt%, whereas carbamides-such as urea, N-methylurea, N-ethylurea, 1,3-dimethylurea, and imidazolidone-were able to improve the dissolution of cellulose. At 5 wt% cellulose concentration, the highest carbamide contents in the solvent still able to dissolve cellulose within 1 h were 56 and 55 wt% of 1,3-dimethylurea and N-methylurea, respectively. When using urea, up to 15% of cellulose could be dissolved in a solution containing 22 wt% of urea. To demonstrate the possibility of the use of a carbamidebased solvent in cellulose modification, cationic cellulose was produced using glycidyltrimethylammonium chloride (GTAC). At a molar ratio of 1:3 of cellulose and GTAC, all the studied TEAOH-carbamide solvents produce cationic cellulose with higher charge density compared to the reference NaOH-urea solvent.

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Rapid Dissolution of Cellulose in Ionic Liquid with Different Methods

Cited by 7 publications

References 34 publications

Ionic liquids as solvents for making composite materials from cellulose

Ionic liquids as solvents for making composite materials from cellulose

Strengthening Cellulose Nanopaper via Deep Eutectic Solvent and Ultrasound-Induced Surface Disordering of Nanofibers

Room-temperature dissolution and chemical modification of cellulose in aqueous tetraethylammonium hydroxide–carbamide solutions

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