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Preparation of Binary and Ternary Deep Eutectic Systems
Published on: October 31, 2019
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Deep eutectic solvent (TMAH·5H2O/Urea) with low viscosity for cellulose dissolution at room temperature.
Li Li1, Maozhi Zhang1, Yun Feng1
1Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China; Engineering Research Center of Forestry Biomass Materials and Energy, Ministry of Education, Beijing Forestry University, Beijing 100083, China.
Carbohydrate Polymers
|June 1, 2024
Summary
A novel deep eutectic solvent (DES) effectively dissolves cellulose at room temperature. This low-viscosity solvent shows promise for fiber manufacturing and cellulose utilization.
Area of Science:
- Materials Science
- Green Chemistry
- Polymer Chemistry
Background:
- Cellulose dissolution is crucial for its versatile applications.
- Traditional solvents often pose environmental and safety concerns.
- Developing efficient and sustainable cellulose solvents remains a challenge.
Purpose of the Study:
- To design and characterize a novel deep eutectic solvent (DES) for cellulose dissolution at room temperature.
- To evaluate the solvent's performance in terms of cellulose loading, viscosity, and structural impact.
- To investigate the solvent properties influencing cellulose solubility.
Main Methods:
- Formulation of a tetramethylammonium hydroxide pentahydrate/urea (TMAH·5H2O/Urea) based DES.
- Optimization of the DES molar ratio for maximum cellulose dissolution.
- Characterization of cellulose solubility, viscosity, and structural changes (crystallinity, DP) using analytical techniques.
- Determination of Kamlet-Taft parameters to understand solvent-solute interactions.
Main Results:
- The optimized 1:3 M TMAH·5H2O/Urea DES dissolved up to 7.5 wt% of high DP cellulose (526) at room temperature.
- Both the pure DES and cellulose/DES mixtures exhibited low viscosity, suitable for fiber spinning.
- Cellulose structure transformed from type I to type II, with reduced crystallinity and DP.
- The DES demonstrated high hydrogen bond basicity, facilitating effective cellulose solvation.
Conclusions:
- The TMAH·5H2O/Urea DES offers an efficient, low-viscosity system for cellulose dissolution at room temperature.
- This solvent system presents advantages in synthesis simplicity and cellulose solubility.
- It holds significant potential for advancing cellulose processing and applications in fiber manufacturing.
