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Study on the Dissolution Mechanism of Cellulose by ChCl-Based Deep Eutectic Solvents

Four deep eutectic solvents (DESs), namely, glycerol/chlorocholine (glycerol/ChCl), urea/ChCl, citric acid/ChCl, and oxalic acid/ChCl, were synthesized and their performance in the dissolution of cellulose was studied. The results showed that the melting point of the DESs varied with the proportion...

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Autores principales: Zhang, Heng, Lang, Jinyan, Lan, Ping, Yang, Hongyan, Lu, Junliang, Wang, Zhe
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7014281/
https://www.ncbi.nlm.nih.gov/pubmed/31936299
http://dx.doi.org/10.3390/ma13020278
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author Zhang, Heng
Lang, Jinyan
Lan, Ping
Yang, Hongyan
Lu, Junliang
Wang, Zhe
author_facet Zhang, Heng
Lang, Jinyan
Lan, Ping
Yang, Hongyan
Lu, Junliang
Wang, Zhe
author_sort Zhang, Heng
collection PubMed
description Four deep eutectic solvents (DESs), namely, glycerol/chlorocholine (glycerol/ChCl), urea/ChCl, citric acid/ChCl, and oxalic acid/ChCl, were synthesized and their performance in the dissolution of cellulose was studied. The results showed that the melting point of the DESs varied with the proportion of the hydrogen bond donor material. The viscosity of the DESs changed considerably with the change in temperature; as the temperature increased, the viscosity decreased and the electrical conductivity increased. Oxalic acid/ChCl exhibited the best dissolution effects on cellulose. The microscopic morphology of cellulose was observed with a microscope. The solvent system effectively dissolved the cellulose, and the dissolution method of the oxalic acid/ChCl solvent on cellulose was preliminarily analyzed. The ChCl solvent formed new hydrogen bonds with the hydroxyl groups of the cellulose through its oxygen atom in the hydroxyl group and its nitrogen atom in the amino group. That is to say, after the deep eutectic melt formed an internal hydrogen bond, a large number of remaining ions formed a hydrogen bond with the hydroxyl groups of the cellulose, resulting in a great dissolution of the cellulose. Although the cellulose and regenerated cellulose had similar structures, the crystal form of cellulose changed from type I to type II.
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spelling pubmed-70142812020-03-09 Study on the Dissolution Mechanism of Cellulose by ChCl-Based Deep Eutectic Solvents Zhang, Heng Lang, Jinyan Lan, Ping Yang, Hongyan Lu, Junliang Wang, Zhe Materials (Basel) Article Four deep eutectic solvents (DESs), namely, glycerol/chlorocholine (glycerol/ChCl), urea/ChCl, citric acid/ChCl, and oxalic acid/ChCl, were synthesized and their performance in the dissolution of cellulose was studied. The results showed that the melting point of the DESs varied with the proportion of the hydrogen bond donor material. The viscosity of the DESs changed considerably with the change in temperature; as the temperature increased, the viscosity decreased and the electrical conductivity increased. Oxalic acid/ChCl exhibited the best dissolution effects on cellulose. The microscopic morphology of cellulose was observed with a microscope. The solvent system effectively dissolved the cellulose, and the dissolution method of the oxalic acid/ChCl solvent on cellulose was preliminarily analyzed. The ChCl solvent formed new hydrogen bonds with the hydroxyl groups of the cellulose through its oxygen atom in the hydroxyl group and its nitrogen atom in the amino group. That is to say, after the deep eutectic melt formed an internal hydrogen bond, a large number of remaining ions formed a hydrogen bond with the hydroxyl groups of the cellulose, resulting in a great dissolution of the cellulose. Although the cellulose and regenerated cellulose had similar structures, the crystal form of cellulose changed from type I to type II. MDPI 2020-01-08 /pmc/articles/PMC7014281/ /pubmed/31936299 http://dx.doi.org/10.3390/ma13020278 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Zhang, Heng
Lang, Jinyan
Lan, Ping
Yang, Hongyan
Lu, Junliang
Wang, Zhe
Study on the Dissolution Mechanism of Cellulose by ChCl-Based Deep Eutectic Solvents
title Study on the Dissolution Mechanism of Cellulose by ChCl-Based Deep Eutectic Solvents
title_full Study on the Dissolution Mechanism of Cellulose by ChCl-Based Deep Eutectic Solvents
title_fullStr Study on the Dissolution Mechanism of Cellulose by ChCl-Based Deep Eutectic Solvents
title_full_unstemmed Study on the Dissolution Mechanism of Cellulose by ChCl-Based Deep Eutectic Solvents
title_short Study on the Dissolution Mechanism of Cellulose by ChCl-Based Deep Eutectic Solvents
title_sort study on the dissolution mechanism of cellulose by chcl-based deep eutectic solvents
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7014281/
https://www.ncbi.nlm.nih.gov/pubmed/31936299
http://dx.doi.org/10.3390/ma13020278
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