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Erschienen in: Cellulose 3/2014

01.06.2014 | Original Paper

Dissolution of cellulose in aqueous NaOH/urea solution: role of urea

verfasst von: Bi Xiong, Pingping Zhao, Kai Hu, Lina Zhang, Gongzhen Cheng

Erschienen in: Cellulose | Ausgabe 3/2014

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Abstract

Urea can improve the solubility and stability of cellulose in aqueous alkali solution, while its role has not come to a conclusion. To reveal the role of urea in solution, NMR was introduced to investigate the interaction between urea and the other components in solution. Results from chemical shifts and longitudinal relaxation times show that: (1) urea has no strong direct interaction with cellulose as well as NaOH; (2) urea does not have much influence on the structural dynamics of water. Urea may play its role through van der Waals force. It may accumulate on the cellulose hydrophobic region to prevent dissolved cellulose molecules from re-gathering. The driving force for the self-assembly of cellulose and urea molecules might be hydrophobic interaction. In the process of cellulose dissolution, OH breaks the hydrogen bonds, Na+ hydrations stabilize the hydrophilic hydroxyl groups and urea stabilizes the hydrophobic part of cellulose.

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Metadaten
Titel
Dissolution of cellulose in aqueous NaOH/urea solution: role of urea
verfasst von
Bi Xiong
Pingping Zhao
Kai Hu
Lina Zhang
Gongzhen Cheng
Publikationsdatum
01.06.2014
Verlag
Springer Netherlands
Erschienen in
Cellulose / Ausgabe 3/2014
Print ISSN: 0969-0239
Elektronische ISSN: 1572-882X
DOI
https://doi.org/10.1007/s10570-014-0221-7

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