NMR study of mesomorphic solutions of cellulose derivatives
Highly concentrated solutions of hydroxypropylcellulose and cellulose acetate give mesomorphic phases in a precise range of temperatures and concentrations. The existence of an orientational anisotropy in such solutions induces typical parameters of the high-resolution NMR spectra (chemical shift, splitting) that are similar to those of liquid crystal spectra. In the present work, the high-resolution NMR spectra of nuclei belonging to the solute molecules (D/sub 2/O and trifluoroacetic acid) were recorded as a function of various physical parameters such as temperature, concentration, and temporal change of the solutions. The specific variation of the orientational degree of order for each mesophase is described. In the case of the cellulose acetate/trifluoroacetic acid solution, an order parameter is calculated and a model for the orientational organization of the solution is described. 34 references, 10 figures, 1 table.
- Research Organization:
- Univ. de Nice, France
- OSTI ID:
- 6922705
- 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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AGE DEPENDENCE
ANISOTROPY
CARBOHYDRATES
CARBON 13
CARBON ISOTOPES
CELLULOSE
CELLULOSE ESTERS
CRYSTALS
ESTERS
EVEN-ODD NUCLEI
FLUIDS
FLUORINE 19
FLUORINE ISOTOPES
HEAVY WATER
HYDROGEN COMPOUNDS
ISOTOPES
LIGHT NUCLEI
LIQUID CRYSTALS
LIQUIDS
MAGNETIC RESONANCE
NMR SPECTRA
NUCLEAR MAGNETIC RESONANCE
NUCLEI
ODD-EVEN NUCLEI
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
OXYGEN COMPOUNDS
POLYSACCHARIDES
QUANTITY RATIO
RESONANCE
SACCHARIDES
SPECTRA
STABLE ISOTOPES
STRUCTURAL CHEMICAL ANALYSIS
TEMPERATURE DEPENDENCE
WATER