NMR evidence of hydrogen bonds in cellulose solutions
The nature of cellulose dissolution in the complex solvent system, N,N-dimethylacetamide (DMA) containing lithium chloride, has been studied. The aprotic character of this complex solvent allows us to investigate the dissolution mechanism, using the behavior of the methyl-..beta delta..-cellubioside hydroxyl /sup 1/H NMR signals. It is shown that each hydroxyl group of this cellulose model compound is linked with one lithium chloride molecule in solution. Determination of the hydroxyl proton NMR parameters (chemical shift, coupling constant, temperature increment) in this complex solvent and in DMSO allows us to point out the peculiar behavior of the OH-3 hydroxyl group. It is explained by the existence of an intramolecular hydrogen bond involving this hydroxyl group and the heterocyclic oxygen atom of the neighboring D-glucopyranosyl unit. Similar observations are made for cellulose oligomers of DP = 10 in the complex solvent DMA/LiCl and in DMSO solution and for cellulose in the complex solvent. 25 references, 10 figures, 2 tables.
- Research Organization:
- Centre de Recherches sur les Macromolecules Vegetales, Grenoble, France
- OSTI ID:
- 6971390
- Report Number(s):
- CONF-8205234-Vol.1
- Journal Information:
- J. Appl. Polym. Sci.: Appl. Polym. Symp.; (United States), Journal Name: J. Appl. Polym. Sci.: Appl. Polym. Symp.; (United States); ISSN JPSSD
- Country of Publication:
- United States
- Language:
- English
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ALKALI METAL COMPOUNDS
CARBOHYDRATES
CELLULOSE
CHEMICAL BONDS
CHEMICAL SHIFT
CHLORIDES
CHLORINE COMPOUNDS
DISSOLUTION
ELEMENTS
HALIDES
HALOGEN COMPOUNDS
HYDROGEN
HYDROGEN 1
HYDROGEN ISOTOPES
ISOTOPES
KINETICS
LIGHT NUCLEI
LITHIUM CHLORIDES
LITHIUM COMPOUNDS
LITHIUM HALIDES
MAGNETIC RESONANCE
MOLECULAR STRUCTURE
NMR SPECTRA
NONMETALS
NUCLEAR MAGNETIC RESONANCE
NUCLEI
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
POLYSACCHARIDES
REACTION KINETICS
RESONANCE
SACCHARIDES
SPECTRA
STABLE ISOTOPES
STRUCTURAL CHEMICAL ANALYSIS