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On cellulose dissolution and aggregation in aqueous tetrabutylammonium hydroxide
Marta Gubitosi1, Hugo Duarte2, Luigi Gentile1
1Division of Physical Chemistry, Lund University , SE-22100 Lund, Sweden.
Biomacromolecules
|August 2, 2016
Summary
Tetrabutylammonium hydroxide (TBAH) dissolves cellulose, but aggregates form at higher concentrations. This aggregation impacts rheology and suggests a shift to a more stable cellulose crystal form.
Area of Science:
- Polymer Science
- Materials Chemistry
- Physical Chemistry
Background:
- Aqueous tetrabutylammonium hydroxide (TBAH) is a potential solvent for cellulose processing.
- Understanding cellulose dissolution and aggregation is crucial for applications like fiber spinning.
Purpose of the Study:
- To investigate the dissolution state of cellulose in 40 wt% TBAH(aq).
- To correlate cellulose aggregation with rheological changes using scattering techniques.
Main Methods:
- Rheology measurements.
- Static light scattering (SLS).
- Small-angle X-ray scattering (SAXS).
Main Results:
- Cellulose dissolves molecularly at low concentrations; aggregates form above a critical concentration.
- Aggregation onset correlates with increased scattering intensity, shear thinning, and Cox-Merz rule violation.
- SAXS data indicate a solvation shell enriched in TBA(+) ions.
Conclusions:
- Cellulose solutions in TBAH become supersaturated above a critical concentration.
- This supersaturation may favor the formation of the more stable cellulose II crystal form.
- Results provide insights into cellulose-solvent interactions and phase behavior.
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