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Cellulose–solvent interactions from self-diffusion NMR

Author:
  • Luigi Gentile
  • Ulf Olsson
Publishing year: 2016-08
Language: English
Pages: 2753-2758
Publication/Series: Cellulose
Volume: 23
Issue: 4
Document type: Journal article
Publisher: Springer

Abstract english

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 h>w = 6.1 nm for MCC and 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.

Keywords

  • Chemical Sciences
  • Cellulose
  • NMR
  • Polymer–solvent interaction
  • Self-diffusion
  • Tetrabutylammonium hydroxide

Other

Published
  • ISSN: 0969-0239
Luigi Gentile
E-mail: luigi [dot] gentile [at] fkem1 [dot] lu [dot] se

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MEMEG

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Physical Chemistry

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Microbial Ecology

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MICCS