Abstract
Solutions of glucose, cellobiose and microcrystalline cellulose in the ionic liquid 1-ethyl-3-methyl-imidazolium ([C2mim][OAc]) have been examined using pulsed-field gradient 1H NMR. Diffusion coefficients of the cation and anion across the temperature range 20–70 °C have been determined for a range of concentrations (0–15% w/w) of each carbohydrate in [C2mim][OAc]. These systems behave as an “ideal mixture” of free ions and ions that are associated with the carbohydrate molecules. The molar ratio of carbohydrate OH groups to ionic liquid molecules, α, is the key parameter in determining the diffusion coefficients of the ions. Master curves for the diffusion coefficients of cation, anion and their activation energies are generated upon which all our data collapses when plotted against α. Diffusion coefficients are found to follow an Arrhenius type behavior and the difference in translational activation energy between free and associated ions is determined to be 9.3 ± 0.9 kJ/mol.
Highlights
Biomass-based polymers are taking a more and more important place in the development of sustainable and “green” costeffective industry.[1]
[C2mim][OAc], we likewise found that the anion, though geometrically smaller than the cation, diffuses slower than its counterion, this being so for the cellulose, cellobiose, and glucose solutions
Weight for weight, reduced the diffusion coefficients of the ions the most from that of their pure ionic liquid (IL) values
Summary
Biomass-based polymers are taking a more and more important place in the development of sustainable and “green” costeffective industry.[1] Cellulose is the most abundant naturally occurring biopolymer and is a practically inexhaustible resource for the production of environmentally friendly, biodegradable, and biocompatible products.[2] It is a source of numerous derivatives, cellulose ethers, and esters. Despite these advantages, the full potential of cellulose has not yet been realized. Strong inter- and intramolecular hydrogen bonds in cellulose hinder it from being dissolved in common polymer solvents.[3,4]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
