Dissolution mechanism of cellulose in quaternary ammonium hydroxide: Revisiting through molecular interactions

Zhong, Chao; Cheng, Fang; Zhu, Yingkui; Gao, Zhen; Jia, Honghua; Wei, Ping

doi:10.1016/j.carbpol.2017.06.078

Cited by 49 publications

(20 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Published results showed that the dependence of cellulose dissolution in IL-MS mixtures on the concentration of the MS (reported using different scales, e.g., wt% and χ IL ) is not linear, but shows a maximum at a certain solvent composition [62,69,70]. A rationale for this non-linear dependence is shown in the following schematic representation for the dissolution of MCC in EtMeImX-DMSO (X = AcO − ; diethylphosphate, methylphosphonate; BF 4 − ; Figure 7).…”

Section: Binary Mixtures Of Ionic Liquids-molecular Solvents As Cellumentioning

confidence: 99%

“…The complex interplay between H-bonding, ionization effects, and hydrophobic interactions is crucial to control dissolution, regeneration, gelation, and related phenomena [40]. As shown above, cellulose dissolution mechanism has been investigated in detail in recent years [10,40,70,81,[89][90][91][92][93][94][95][96][97][98][99][100][101]. Cellulose regeneration was less investigated due to the inherent difficulty of studying this phenomenon.…”

Section: Mechanism Of Regeneration Of Dissolved Cellulosementioning

confidence: 99%

See 1 more Smart Citation

Cellulose in Ionic Liquids and Alkaline Solutions: Advances in the Mechanisms of Biopolymer Dissolution and Regeneration

et al. 2019

View full text Add to dashboard Cite

This review is focused on assessment of solvents for cellulose dissolution and the mechanism of regeneration of the dissolved biopolymer. The solvents of interest are imidazole-based ionic liquids, quaternary ammonium electrolytes, salts of super-bases, and their binary mixtures with molecular solvents. We briefly discuss the mechanism of cellulose dissolution and address the strategies for assessing solvent efficiency, as inferred from its physico-chemical properties. In addition to the favorable effect of lower cellulose solution rheology, microscopic solvent/solution properties, including empirical polarity, Lewis acidity, Lewis basicity, and dipolarity/polarizability are determinants of cellulose dissolution. We discuss how these microscopic properties are calculated from the UV-Vis spectra of solvatochromic probes, and their use to explain the observed solvent efficiency order. We dwell briefly on use of other techniques, in particular NMR and theoretical calculations for the same purpose. Once dissolved, cellulose is either regenerated in different physical shapes, or derivatized under homogeneous conditions. We discuss the mechanism of, and the steps involved in cellulose regeneration, via formation of mini-sheets, association into "mini-crystals", and convergence into larger crystalline and amorphous regions. We discuss the use of different techniques, including FTIR, X-ray diffraction, and theoretical calculations to probe the forces involved in cellulose regeneration.

show abstract

Section: Binary Mixtures Of Ionic Liquids-molecular Solvents As Cellumentioning

confidence: 99%

Section: Mechanism Of Regeneration Of Dissolved Cellulosementioning

confidence: 99%

Cellulose in Ionic Liquids and Alkaline Solutions: Advances in the Mechanisms of Biopolymer Dissolution and Regeneration

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Previous experiments looking at cellulose solubility in TBAH studied the inuence of water concentration on the solubility limit. 25,72 Solubility experiments with TBAH/urea mixtures reported solution turbidities as a function of urea concentration for a xed amount of cellulose. Few quantitative measurements relating cellulose solubility with urea content in TBAH solutions are available.…”

Section: Solubility Experimentsmentioning

confidence: 99%

“…Both tetrabutylammonium hydroxide (TBAH) and tetrabutylphosphonium hydroxide (TBPH) have been shown to rapidly dissolve up to 20 wt% cellulose at room temperature. 24,25 Furthermore, these solvents function in the presence of large amounts of water, nearly half by weight, and have hygroscopic points near the optimal composition for solubility. 26 Studies of these systems have shown that [TBA] + preferentially solvates cellulose and that the cation's hydrophobicity promotes dissolution.…”

Section: Introductionmentioning

confidence: 99%

The role of urea in the solubility of cellulose in aqueous quaternary ammonium hydroxide

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Hydrated ionic liquids, such as aqueous alkylammonium (Ema et al 2014;Zhong et al 2017) and alkylphosphonium hydroxides (Hyväkkö et al 2014), are another class of solvents studied in the case of cellulose processing. Due to their amphiphilic properties of cellulose (Lindman et al 2010), amphiphilic alkylammonium and alkylphosphonium hydroxides are shown to be efficient solvent for cellulose (Wei et al 2017).…”

Section: Introductionmentioning

confidence: 99%

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

Sirviö

Heiskanen

2019

Cellulose

View full text Add to dashboard Cite

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.

show abstract

Dissolution mechanism of cellulose in quaternary ammonium hydroxide: Revisiting through molecular interactions

Cited by 49 publications

References 59 publications

Cellulose in Ionic Liquids and Alkaline Solutions: Advances in the Mechanisms of Biopolymer Dissolution and Regeneration

Cellulose in Ionic Liquids and Alkaline Solutions: Advances in the Mechanisms of Biopolymer Dissolution and Regeneration

The role of urea in the solubility of cellulose in aqueous quaternary ammonium hydroxide

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

Contact Info

Product

Resources

About