ISSN:
1042-7147
Keywords:
transitional metal ions
;
liquid crystal
;
complex formation
;
hydroxyethyl cellulsoe acetate
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The influence of inorganic salts on the formation of lyotropic liquid crystals of hydroxyethyl cellulose acetate (HECA) in N,N′dimethylformamide (DMF) was studied. In the presence of CaCl2, an inorganic salt of a principal group metal, the solution of HECA/DMF/CaCl2 was a biphasic system. The temperature of the transformation from the liquid crystalline phase to the isotropic one increased with adding CaCl2 because local HECA concentration increases in the HECA/DMF phase. When CuCl2 or CoCl2, inorganic salts of transitional metals, was added, the solutions were monophasic systems and the complexes of HECA with Cu2+ or Co2+ were formed in solutions, which results in the increase of the temperature of the transfomation from the liquid crystalline phase to the isotropic one.
Additional Material:
7 Ill.
Type of Medium:
Electronic Resource
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