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Cellulose
Erschienen in: Cellulose 2/2016

12.02.2016 | Original Paper

Dual effects of dimethylsulfoxide on cellulose solvating ability of 1-allyl-3-methylimidazolium chloride

verfasst von: Chao Zhang, Hongliang Kang, Pingping Li, Zhijing Liu, Yijin Zhang, Ruigang Liu, Jun-feng Xiang, Yong Huang

Erschienen in: Cellulose | Ausgabe 2/2016

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Abstract

Polar aprotic solvents are considered to act as cosolvents with ionic liquids (ILs) for cellulose, strengthening the solvating ability of ILs by improving their cellulose solvating kinetics without influencing the solubility of cellulose in ILs. In this work, it was found that dimethylsulfoxide (DMSO) at low concentration improves the cellulose solvating ability of [AMIM][Cl], but weakens it at high concentration. To clarify the mechanism of these dual effects of DMSO on the cellulose solvating ability of [AMIM][Cl], the [AMIM][Cl]/DMSO system was investigated using excess infrared spectroscopy, nuclear magnetic resonance (NMR) T 2 relaxometry, 1H NMR, 35Cl NMR, and dynamic light scattering. The results indicate that the tight association between the cation and anion in the [AMIM][Cl] network is loosened at low DMSO concentration. As a result, mass transport is accelerated due to the enhanced dynamics of [AMIM][Cl], promoting the cellulose solvating kinetics of [AMIM][Cl]. However, ion clusters of [AMIM][Cl] start to form when the molar fraction of DMSO (x DMSO) exceeds 0.5. The hydrogen bonds between cations and anions in the ion clusters become much stronger than in pure [AMIM][Cl], leading to decreased ability of [AMIM][Cl] to form hydrogen bonds with cellulose and thus decreased cellulose solubility in the [AMIM][Cl]/DMSO mixture.
Vorheriger Artikel Sulfolane pretreatment of shrub willow to improve enzymatic saccharification
Nächster Artikel Thermal inverse phase transition of azobenzene hydroxypropylcellulose in aqueous solutions

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Metadaten
Titel
Dual effects of dimethylsulfoxide on cellulose solvating ability of 1-allyl-3-methylimidazolium chloride
verfasst von
Chao Zhang
Hongliang Kang
Pingping Li
Zhijing Liu
Yijin Zhang
Ruigang Liu
Jun-feng Xiang
Yong Huang
Publikationsdatum
12.02.2016
Verlag
Springer Netherlands
Erschienen in
Cellulose / Ausgabe 2/2016
Print ISSN: 0969-0239
Elektronische ISSN: 1572-882X
DOI
https://doi.org/10.1007/s10570-016-0876-3

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