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13.06.2016 | Note

Cellulose–solvent interactions from self-diffusion NMR

verfasst von: Luigi Gentile, Ulf Olsson

Erschienen in: Cellulose | Ausgabe 4/2016

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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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Titel: Cellulose–solvent interactions from self-diffusion NMR
verfasst von: Luigi Gentile
Ulf Olsson
Publikationsdatum: 13.06.2016
Verlag: Springer Netherlands
Erschienen in: Cellulose / Ausgabe 4/2016
Print ISSN: 0969-0239
Elektronische ISSN: 1572-882X
DOI: https://doi.org/10.1007/s10570-016-0984-0

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