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Effects of temperature on cellulose hydrogen bonds during dissolution in ionic liquid
Xiaoyi Wei1, Yihong Wang1, Jihua Li1
1Key Laboratory of Tropical Crop Products, Processing of Ministry of Agriculture and Rural Affairs, Agricultural Products Processing Research Institute, Chinese Academy of Tropical Agricultural Sciences, Zhanjiang 524001, PR China.
Temperature significantly impacts cellulose dissolution in ionic liquids by affecting hydrogen bond disruption. Understanding these temperature-dependent mechanisms optimizes cellulose processing and yield.
Area of Science:
- Materials Science
- Polymer Chemistry
- Physical Chemistry
Background:
- Ionic liquids are effective solvents for cellulose dissolution.
- The role of temperature in cellulose dissolution mechanisms is not fully understood.
Purpose of the Study:
- To investigate the effect of temperature on cellulose dissolution in ionic liquids.
- To elucidate the temperature-dependent mechanisms of cellulose dissolution.
Main Methods:
- X-ray diffraction (XRD)
- Fourier transform infrared spectroscopy (FTIR)
- Solid-state CP/MAS 13C NMR
- X-ray photoelectron spectroscopy (XPS)
- Gel permeation chromatography (GPC)
Main Results:
- Temperature influences the disruption of cellulose's hydrogen bond network.
- Disruption of intramolecular hydrogen bonds (O(3) H-O (5)) facilitates dissolution at lower temperatures.
- Disruption of intramolecular hydrogen bonds (O(2) H-O (6)) is key to dissolution at higher temperatures.
Conclusions:
- Different hydrogen bonds in cellulose are disrupted at varying temperatures, influencing dissolution.
- Optimizing dissolution temperature can enhance cellulose yield and minimize degradation.
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