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

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 (DMS...

Full description

Saved in:
Bibliographic Details
Published in:Cellulose (London) 2016-04, Vol.23 (2), p.1165-1175
Main Authors: Zhang, Chao, Kang, Hongliang, Li, Pingping, Liu, Zhijing, Zhang, Yijin, Liu, Ruigang, Xiang, Jun-feng, Huang, Yong
Format: Article
Language:English
Subjects:
Anions
Bioorganic Chemistry
Bonding strength
Cations
Cellulose
Ceramics
Chemistry
Chemistry and Materials Science
Clusters
Composites
Glass
Hydrogen bonds
Hydrogen storage
Ionic liquids
Natural Materials
NMR
Nuclear magnetic resonance
Organic Chemistry
Original Paper
Photon correlation spectroscopy
Physical Chemistry
Polymer Sciences
Resonance scattering
Solubility
Sustainable Development
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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, 1 H NMR, 35 Cl 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.
ISSN:0969-0239
1572-882X
DOI:10.1007/s10570-016-0876-3