Molecular self-diffusion coefficients were measured in solutions of microcrystalline cellulose (MCC) and dissolving pulp, in 40 wt% aqueous tetrabutylammonium hydroxide (TBAH), using pulsed field gradient stimulated echo NMR. From the cellulose diffusion coefficients, a weight averaged radius of hydration < R-h >(w) = 6.1 nm for MCC and < R-h >(w) = 15 nm for pulp were obtained. Water and TBA(+) ions show a significantly different dependence on the cellulose concentration, revealing different molecular interactions with the polymer. Water-cellulose are essentially excluded volume. TBA(+) ions, on the other hand, bind to cellulose with approximately 1.2 TBA(+) ions per glucose unit.

Cellulose–solvent interactions from self-diffusion NMR

Gentile L.
;
2016

Abstract

Molecular self-diffusion coefficients were measured in solutions of microcrystalline cellulose (MCC) and dissolving pulp, in 40 wt% aqueous tetrabutylammonium hydroxide (TBAH), using pulsed field gradient stimulated echo NMR. From the cellulose diffusion coefficients, a weight averaged radius of hydration < R-h >(w) = 6.1 nm for MCC and < R-h >(w) = 15 nm for pulp were obtained. Water and TBA(+) ions show a significantly different dependence on the cellulose concentration, revealing different molecular interactions with the polymer. Water-cellulose are essentially excluded volume. TBA(+) ions, on the other hand, bind to cellulose with approximately 1.2 TBA(+) ions per glucose unit.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11586/249606
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