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Study on the Dissolution Mechanism of Cellulose by ChCl-Based Deep Eutectic Solvents
Heng Zhang1,2,3, Jinyan Lang1, Ping Lan2
1College of Marine Science and Biological Engineering, Qingdao University of Science & Technology, Qingdao 266042, China.
Materials (Basel, Switzerland)
|January 16, 2020
Summary
Oxalic acid/chlorocholine deep eutectic solvents effectively dissolved cellulose by forming new hydrogen bonds. This study explores novel solvent systems for cellulose dissolution and regeneration.
Area of Science:
- Green Chemistry
- Materials Science
- Polymer Chemistry
Background:
- Deep eutectic solvents (DESs) are emerging as sustainable alternatives to traditional solvents.
- Cellulose dissolution is crucial for its processing into various materials.
- Understanding solvent-biopolymer interactions is key to efficient dissolution.
Purpose of the Study:
- To synthesize and evaluate four deep eutectic solvents for cellulose dissolution.
- To investigate the influence of DES composition and temperature on cellulose solubility.
- To elucidate the mechanism of cellulose dissolution by DESs.
Main Methods:
- Synthesis of four DESs: glycerol/ChCl, urea/ChCl, citric acid/ChCl, and oxalic acid/ChCl.
- Characterization of DES properties (melting point, viscosity, conductivity).
- Microscopic analysis of cellulose morphology before and after dissolution.
Main Results:
- DES properties varied with hydrogen bond donor proportion and temperature.
- Oxalic acid/ChCl demonstrated superior cellulose dissolution.
- Cellulose crystal structure transformed from Type I to Type II upon regeneration.
Conclusions:
- Deep eutectic solvents, particularly oxalic acid/ChCl, offer effective cellulose dissolution.
- The dissolution mechanism involves hydrogen bonding between DES ions and cellulose hydroxyl groups.
- DESs show potential for cellulose regeneration and material development.
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