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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.)

Cellulose Dissolution in Mixtures of Ionic Liquids and Dimethyl Sulfoxide: A Quantitative Assessment of the Relative Importance of Temperature and Composition of the Binary Solvent

Full text
Author(s):
Dignani, Marcella T. [1] ; Bioni, Thais A. [1] ; Paixao, Thiago R. L. C. [1] ; El Seoud, Omar A. [1]
Total Authors: 4
Affiliation:
[1] Univ Sao Paulo, Inst Chem, 748 Prof Lineu Prestes Ave, BR-05508000 Sao Paulo - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Molecules; v. 25, n. 24 DEC 2020.
Web of Science Citations: 0
Abstract

We studied the dissolution of microcrystalline cellulose (MCC) in binary mixtures of dimethyl sulfoxide (DMSO) and the ionic liquids: allylbenzyldimethylammonium acetate; 1-(2-methoxyethyl)-3-methylimidazolium acetate; 1,8-diazabicyclo {[}5.4.0]undec-7-ene-8-ium acetate; tetramethylguanidinium acetate. Using chemometrics, we determined the dependence of the mass fraction (in %) of dissolved cellulose (MCC-m%) on the temperature, T = 40, 60, and 80 degrees C, and the mole fraction of DMSO, chi(DMSO) = 0.4, 0.6, and 0.8. We derived equations that quantified the dependence of MCC-m% on T and chi(DMSO). Cellulose dissolution increased as a function of increasing both variables; the contribution of chi(DMSO) was larger than that of T in some cases. Solvent empirical polarity was qualitatively employed to rationalize the cellulose dissolution efficiency of the solvent. Using the solvatochromic probe 2,6-dichloro-4-(2,4,6-triphenylpyridinium-1-yl)phenolate (WB), we calculated the empirical polarity E-T(WB) of cellobiose (a model for MCC) in ionic liquid (IL)-DMSO mixtures. The E-T(WB) correlated perfectly with T (fixed chi(DMSO)) and with chi(DMSO) (fixed T). These results show that there is ground for using medium empirical polarity to assess cellulose dissolution efficiency. We calculated values of MCC-m% under conditions other than those employed to generate the statistical model and determined the corresponding MCC-m% experimentally. The excellent agreement between both values shows the robustness of the statistical model and the usefulness of our approach to predict cellulose dissolution, thus saving time, labor, and material. (AU)

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
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: 19/16491-0 - Rapid, onsite detection of toxic metals combining paper-based electrochemical sensors and fast-scan cyclic voltammetry
Grantee:Thiago Regis Longo Cesar da Paixão
Support Opportunities: Regular Research Grants
FAPESP's process: 18/08782-1 - Miniaturized and integrated chemical sensors: new fabrication platforms for biological, clinical and environmental applications
Grantee:Mauro Bertotti
Support Opportunities: Research Projects - Thematic Grants