Study of Cellulose Dissolution in ZnO/NaOH/Water Solvent Solution and Its Temperature-Dependent Effect Using...

Area of Science:

• Polymer Science
• Materials Chemistry
• Physical Chemistry

Background:

• Cellulose, a versatile biopolymer, requires dissolution for many applications.
• Developing effective and eco-friendly cellulose solvents is a significant challenge.
• Aqueous zinc oxide/sodium hydroxide (ZnO/NaOH/Water) is a promising solvent system due to its low cost and environmental benefits.

Purpose of the Study:

• To investigate the behavior of cellulose chains in aqueous ZnO/NaOH solution.
• To determine the impact of temperature on cellulose solubility in this system.
• To elucidate the molecular mechanisms governing cellulose dissolution and precipitation.

Main Methods:

• Molecular dynamics (MD) simulations were employed to model cellulose in aqueous ZnO/NaOH.
• Key parameters analyzed included root mean square deviation (RMSD), interaction energy, and hydrogen bonding.
• Radial distribution functions were used to assess molecular interactions and structural changes.

Main Results:

• Cellulose demonstrated insolubility in the ZnO/NaOH solvent at room temperature (298 K).
• A decrease in temperature (273 K to 268 K) induced geometric deformation of cellulose chains.
• Reduced interchain hydrogen bonds were observed over simulation time at lower temperatures.

Conclusions:

• Aqueous ZnO/NaOH is an effective solvent for cellulose at temperatures between 268 K and 273 K.
• Temperature plays a critical role in modulating cellulose solubility in this solvent system.
• The findings provide insights into cellulose-solvent interactions and guide the development of cellulose processing techniques.