Abstract
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.
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