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Novel solvents in cellulose chemistry: synthesis, properties, and application of quaternaryammonium electrolytes for dissolution, regeneration, and derivatization of cellulose

Grant number: 16/22869-7
Support Opportunities:Scholarships in Brazil - Post-Doctoral
Effective date (Start): June 01, 2017
Effective date (End): May 31, 2021
Field of knowledge:Physical Sciences and Mathematics - Chemistry - Organic Chemistry
Acordo de Cooperação: Coordination of Improvement of Higher Education Personnel (CAPES)
Principal Investigator:Omar Abou El Seoud
Grantee:Marc Kostag
Host Institution: Instituto de Química (IQ). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated research grant:14/22136-4 - Use of green solvents and their mixtures for optimizing chemical processes, AP.TEM


Processing of cellulose, the most abundant renewable terrestrial biopolymer, is still connected with some limitations. In particular the dissolution of this polysaccharide is not fully understood. Consequently, the available commercial products are produced by heterogeneous processes (solid cellulose/liquid bath). This makes the fabrication of speciality products difficult since tailored reproducible properties are required. The growing interest in sustainable and green technologies increased the demand to develop new, more efficient cellulose solvents to replace the existing ones. In this proposal, an approach to a new class of cellulose solvents based on quaternary ammonium electrolytes (QAE) dissolved in molecular solvents, MSs, will be investigated. Cellulose dissolution in these systems is physical, i.e., without formation of covalent polymer-solvent bonds. Thus, a series of QAE will be synthesized, dissolved in various MSs, and their efficiency as cellulose solvents evaluated. Additionally, the detailed physicochemical characterization of the obtained mixtures, and cellulose solutions therein will contribute to a better understanding of cellulose-solvent interactions. This may define threshold values for various parameters of the solvent (e.g., its empirical polarity and basicity) to predict dissolution of cellulose. These parameters will be determined by use of solvatochromic indicators. The best solvent system(s) will be used as medium for dissolution of microcrystalline and fibrous cellulose, regeneration, and its controlled acylation under homogeneous reaction conditions in order to obtain mixed esters of carboxylic acids with new properties. (AU)

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Scientific publications (10)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
EL SEOUD, OMAR A.; JEDVERT, KERSTIN; KOSTAG, MARC; POSSIDONIO, SHIRLEY. Cellulose, chitin and silk: the cornerstones of green composites. EMERGENT MATERIALS, . (16/22869-7, 17/06394-1)
EL SEOUD, OMAR A.; KOSTAG, MARC; POSSIDONIO, SHIRLEY; DIGNANI, MARCELLA T.; PIRES, PAULO A. R.; LOURENCO, MATHEUS C.. issolution of Silk Fibroin in Mixtures of Ionic Liquids and Dimethyl Sulfoxide: On the Relative Importance of Temperature and Binary Solvent Compositio. POLYMERS, v. 14, n. 1, . (16/22869-7, 14/22136-4)
KOSTAG, MARC; DIGNANI, MARCELLA TEIXEIRA; LOURENCO, MATHEUS COSTA; BIONI, THAIS DE ALMEIDA; EL SEOUD, OMAR A.. Assessing cellulose dissolution efficiency in solvent systems based on a robust experimental quantification protocol and enthalpy data. HOLZFORSCHUNG, v. 73, n. 12, p. 1103-1112, . (17/06394-1, 14/22136-4, 16/22869-7)
KOSTAG, MARC; GERICKE, MARTIN; HEINZE, THOMAS; EL SEOUD, OMAR A.. Twenty-five years of cellulose chemistry: innovations in the dissolution of the biopolymer and its transformation into esters and ethers. Cellulose, v. 26, n. 1, SI, p. 139-184, . (14/22136-4, 16/22869-7)
KOSTAG, MARC; JEDVERT, KERSTIN; EL SEOUD, OMAR A.. Engineering of sustainable biomaterial composites from cellulose and silk fibroin: Fundamentals and applications. International Journal of Biological Macromolecules, v. 167, p. 687-718, . (16/22869-7, 14/22136-4, 17/06394-1)
EL SEOUD, OMAR A.; KOSTAG, MARC; JEDVERT, KERSTIN; MALEK, NAVED I.. Cellulose Regeneration and Chemical Recycling: Closing the ``Cellulose Gap{''} Using Environmentally Benign Solvents. MACROMOLECULAR MATERIALS AND ENGINEERING, v. 305, n. 4, . (17/06394-1, 14/22136-4, 16/22869-7)
EL SEOUD, OMAR A.; KOSTAG, MARC; JEDVERT, KERSTIN; MALEK, NAVED I.. Cellulose in Ionic Liquids and Alkaline Solutions: Advances in the Mechanisms of Biopolymer Dissolution and Regeneration. POLYMERS, v. 11, n. 12, . (14/22136-4, 16/22869-7, 17/06394-1)

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