Cellulose–solvent interactions from self-diffusion NMR

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• 作者：Luigi Gentile ; Ulf Olsson
• 刊名：Cellulose
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：23
• 期：4
• 页码：2753-2758
• 全文大小：914 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Bioorganic Chemistry
  Physical Chemistry
  Organic Chemistry
  Polymer Sciences
  
• 出版者：Springer Netherlands
• ISSN：1572-882X
• 卷排序：23

文摘

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.KeywordsCelluloseSelf-diffusionNMRPolymer–solvent interactionTetrabutylammonium hydroxide