Swelling behaviors of natural cellulose in ionic liquid aqueous solutions

Abstract

In the study, a series of methylimidazolium ionic liquids were prepared, including five acidic and seven neutral ionic liquids; and the effects of these ionic liquids on swelling behavior of bagasse cellulose were investigated. The focus of this work is to investigate the relationship between the properties of ionic liquids and the swelling capacity. The swelling absorbency for cellulose in the acidic ionic liquid aqueous solutions was less than in distilled water. It was found that the partial hydrolysis on cellulose surface occurred along with swelling simultaneously. In neutral ionic liquid aqueous solutions, the nonlinearity of swelling ability with the alkyl chain length was discovered. It could be attributed to the dual role of hydrophobic interactions and steric effects provided by cations. Furthermore, small polarizable anions also contribute to the swelling of cellulose to some extent. The properties of treated cellulose were also investigated and compared with the native fibers by scanning electron microscopy. V C 2013 Wiley Periodicals, Inc. J.Appl. Polym. Sci. 2014, 131, 40199.

Screening of glycoside hydrolases and ionic liquids for fibre modification

“…Pulp reactivity characterized by fibre dissolution in cellulose solvents is reported to increase with mechanical and enzymatic treatments . On the other hand, cellulose solvents, such as ionic liquids (ILs) can be used to swell and disrupt fibre surfaces …”

“…1,2 On the other hand, cellulose solvents, such as ionic liquids (ILs) can be used to swell and disrupt fibre surfaces. 3 One of the most interesting developments in cellulose chemistry during recent decades is the discovery of cellulose-dissolving ionic liquids (ILs). 4 ILs are salts with low melting points (<100 ∘ C).…”

Ultrasonic Extraction of Tropane Alkaloids from Radix physochlainae Using as Extractant an Ionic Liquid with Similar Structure

“…Compared with the morphology of various residues after extraction by the three solvents, the surface of the sample extracted by ionic liquids has more holes than those extracted by ethanol and hydrochloric acid. Besides simple external destruction, the swelling effect of IL is more obvious than with the other two extractants, which is also very beneficial for substance exchange between inside and outside the cell membrane [17]. Under the influence of multiple actions, it shows that the structure of the herbal materials can be transformed to a greater extent by ultrasonic extraction under the above conditions, and IL molecules can enter into the plant cells and interact with the target alkaloids more easily.…”

Fundamental Understanding of Cellulose Dissolution Can Improve the Efficiency of Biomass Processing

“…An improved fundamental understanding of cellulose dissolution can guide the rational selection of solvents and the optimization of processing conditions, thus leading to an enhanced utilization of biomass. and a swelling of the cellulosic particles [23,24]. After a certain induction time, cellulose chains gradually become disentangled and move out of their network into the bulk solution [12].…”