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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Understanding cellulose dissolution in ionic liquid-dimethyl sulfoxide binary mixtures: Quantification of the relative importance of hydrogen bonding and hydrophobic interactions

Full text
Author(s):
El Seoud, Omar A. [1] ; Bioni, Thais A. [1] ; Dignani, Marcella T. [1]
Total Authors: 3
Affiliation:
[1] Univ Sao Paulo, Inst Chem, 748 Prof Lineu Prestes Av, BR-05508000 Sao Paulo, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: JOURNAL OF MOLECULAR LIQUIDS; v. 322, JAN 15 2021.
Web of Science Citations: 0
Abstract

We studied the dissolution of microcrystalline cellulose (MCC) in mixtures of dimethyl sulfoxide (DMSO) with 32 ionic liquids (ILs), at a fixed temperature (70 degrees C) and mole fraction of DMSO (chi(DMSO) = 0.6). Under these conditions, employing a recommended dissolution protocol, MCC dissolved in 19 IL-DMSO mixtures. In order to access quantitatively the relative importance (to biopolymer dissolution) of cellulose-solvent interactions, we correlated the mass fraction of dissolved cellulose (MCC-m%) with physicochemical properties of these mixtures. The solvent descriptors that gave the best correlations are Lewis acidity and Lewis basicity (calculated from the UV-Vis spectra of solvatochromic probes), the molar volume of the IL, and the Lorentz-Lorenz refractive index function of the IL-DMSO mixtures. This result is similar to that observed when solvent empirical polarities of these binary mixtures were correlated with the same descriptors. The multi-parameter correlations quantify, for the first time, the relative importance of cellulose-solvent interactions. Our results agree with the established opinion that an efficient cellulose solvent should disrupt the inter- and intramolecular hydrogen bonding in cellulose, and the hydrophobic interactions present due to the amphiphilic nature of the biopolymer. (C) 2020 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 19/02928-7 - Ionic liquids (ILs) recyclable for cellulose dissolution and regeneration: molecular structure / performance ratio, and properties of regenerated cellulose
Grantee:Marcella Teixeira Dignani
Support Opportunities: Scholarships in Brazil - Scientific Initiation
FAPESP's process: 14/22136-4 - Use of green solvents and their mixtures for optimizing chemical processes
Grantee:Omar Abou El Seoud
Support Opportunities: Research Projects - Thematic Grants