Dissolution and Gelation of Cellulose in TBAF/DMSO Solutions: The Roles of Fluoride Ions and Water

Dissolution and Gelation of Cellulose in TBAF/DMSO Solutions: The Roles of Fluoride Ions and Water

Solutions of cellulose in a mixture of tetrabutylammonium fluoride and dimethyl sulfoxide (TBAF/DMSO) containing small and varying amounts of water were studied by nuclear magnetic resonance (NMR). By measuring the composition dependences of 19F NMR and 1H NMR chemical shifts and line widths, detail...

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Published in:Biomacromolecules Vol. 10; no. 9; pp. 2401 - 2407
Main Authors: Östlund, Åsa, Lundberg, Dan, Nordstierna, Lars, Holmberg, Krister, Nydén, Magnus
Format: Journal Article
Language:English
Published: Washington, DC American Chemical Society 14-09-2009
Subjects:
Applied sciences
Cellulose - chemistry
Cellulose and derivatives
Dimethyl Sulfoxide
Exact sciences and technology
Fluorides - chemistry
Gels
Hydrogen Bonding
Magnetic Resonance Spectroscopy
Natural polymers
Physicochemistry of polymers
Quaternary Ammonium Compounds
Solutions
Viscosity
Water - chemistry
Quaternary ammonium compound
Organic solution
Methyl sulfoxide
Gelation
Cellulose
Physical gel
Experimental study
Dissolution
Saline solution
Mechanism
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Abstract Solutions of cellulose in a mixture of tetrabutylammonium fluoride and dimethyl sulfoxide (TBAF/DMSO) containing small and varying amounts of water were studied by nuclear magnetic resonance (NMR). By measuring the composition dependences of 19F NMR and 1H NMR chemical shifts and line widths, details on the dissolution and gelation mechanisms for cellulose in TBAF/DMSO were elucidated. Our results suggest that the strongly electronegative fluoride ions act as hydrogen bond acceptors to cellulose hydroxyl groups, thus dissolving the polymer by breaking the cellulose−cellulose hydrogen bonds and by rendering the chains an effective negative charge. It was found that the fluoride ions also interact strongly with water. Small amounts of water remove the fluoride ions from the cellulose chains and allow reformation of the cellulose−cellulose hydrogen bonds, which leads to formation of highly viscous solutions or gels even at low cellulose concentrations.
AbstractList Solutions of cellulose in a mixture of tetrabutylammonium fluoride and dimethyl sulfoxide (TBAF/DMSO) containing small and varying amounts of water were studied by nuclear magnetic resonance (NMR). By measuring the composition dependences of (19)F NMR and (1)H NMR chemical shifts and line widths, details on the dissolution and gelation mechanisms for cellulose in TBAF/DMSO were elucidated. Our results suggest that the strongly electronegative fluoride ions act as hydrogen bond acceptors to cellulose hydroxyl groups, thus dissolving the polymer by breaking the cellulose-cellulose hydrogen bonds and by rendering the chains an effective negative charge. It was found that the fluoride ions also interact strongly with water. Small amounts of water remove the fluoride ions from the cellulose chains and allow reformation of the cellulose-cellulose hydrogen bonds, which leads to formation of highly viscous solutions or gels even at low cellulose concentrations.
Solutions of cellulose in a mixture of tetrabutylammonium fluoride and dimethyl sulfoxide (TBAF/DMSO) containing small and varying amounts of water were studied by nuclear magnetic resonance (NMR). By measuring the composition dependences of 19F NMR and 1H NMR chemical shifts and line widths, details on the dissolution and gelation mechanisms for cellulose in TBAF/DMSO were elucidated. Our results suggest that the strongly electronegative fluoride ions act as hydrogen bond acceptors to cellulose hydroxyl groups, thus dissolving the polymer by breaking the cellulose−cellulose hydrogen bonds and by rendering the chains an effective negative charge. It was found that the fluoride ions also interact strongly with water. Small amounts of water remove the fluoride ions from the cellulose chains and allow reformation of the cellulose−cellulose hydrogen bonds, which leads to formation of highly viscous solutions or gels even at low cellulose concentrations.
Author Östlund, Åsa
Nordstierna, Lars
Nydén, Magnus
Holmberg, Krister
Lundberg, Dan
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  givenname: Lars
  surname: Nordstierna
  fullname: Nordstierna, Lars
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  surname: Holmberg
  fullname: Holmberg, Krister
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  givenname: Magnus
  surname: Nydén
  fullname: Nydén, Magnus
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Keywords Quaternary ammonium compound
Organic solution
Methyl sulfoxide
Gelation
Cellulose
Physical gel
Experimental study
Dissolution
Saline solution
Mechanism
Language English
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Snippet Solutions of cellulose in a mixture of tetrabutylammonium fluoride and dimethyl sulfoxide (TBAF/DMSO) containing small and varying amounts of water were...
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SubjectTerms Applied sciences
Cellulose - chemistry
Cellulose and derivatives
Dimethyl Sulfoxide
Exact sciences and technology
Fluorides - chemistry
Gels
Hydrogen Bonding
Magnetic Resonance Spectroscopy
Natural polymers
Physicochemistry of polymers
Quaternary Ammonium Compounds
Solutions
Viscosity
Water - chemistry
Title Dissolution and Gelation of Cellulose in TBAF/DMSO Solutions: The Roles of Fluoride Ions and Water
URI http://dx.doi.org/10.1021/bm900667q
https://www.ncbi.nlm.nih.gov/pubmed/19642671
https://search.proquest.com/docview/734046696
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