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Probing Interactions in Combined Hydroxide Base Solvents for Improving Dissolution of Cellulose
Beatrice Swensson1, Anette Larsson1,2, Merima Hasani1,2
1Department of Chemistry and Chemical Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden.
Polymers
|June 12, 2020
Summary
Combining sodium hydroxide (NaOH) with tetramethylammonium hydroxide (TMAH) enhances cellulose dissolution more effectively than with benzyltrimethylammonium hydroxide (Triton B). Urea stabilizes NaOH and TMAH solutions but does not interact with cellulose in the presence of Triton B.
Area of Science:
- Cellulose Science
- Polymer Chemistry
- Solution Chemistry
Background:
- Cellulose dissolution is crucial for its processing into various materials.
- Aqueous hydroxide solutions are effective cellulose solvents, but their performance can be tuned.
- Understanding solvent-base interactions is key to optimizing cellulose solubility.
Purpose of the Study:
- To investigate cellulose behavior in aqueous NaOH solutions combined with tetramethylammonium hydroxide (TMAH) or benzyltrimethylammonium hydroxide (Triton B).
- To explore the effects of urea on cellulose solubility and solution stability in these systems.
- To elucidate the underlying intermolecular interactions governing cellulose dissolution.
Main Methods:
- Rheological property assessment using flow sweeps at varying temperatures.
- Probing intermolecular interactions via solvatochromic dye analysis.
- Comparative evaluation of different hydroxide base combinations and urea additives.
Main Results:
- NaOH combined with TMAH demonstrated synergistic effects, yielding superior cellulose dissolution compared to NaOH with Triton B.
- Triton B alone showed higher dissolution ability than TMAH, but the combination with NaOH favored TMAH.
- Urea addition improved the stability of NaOH and/or TMAH solutions without significantly affecting Triton B solutions.
Conclusions:
- The selection of base pairs is critical for synergistic cellulose dissolution.
- Combinations of hydroxide bases offer a promising route to tailor cellulose solution properties.
- Urea's role varies depending on the solvent system, stabilizing some while not interacting with cellulose in others.
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