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Influence of transitional metal ions on lyotropic liquid crystals of hydroxyethyl cellulose acetate in N , N ‐dimethylformamide
Author(s) -
Dai Qizhou,
Huang Yong,
Shen Jiarui
Publication year - 1996
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/(sici)1099-1581(199608)7:8<693::aid-pat566>3.0.co;2-3
Subject(s) - materials science , dimethylformamide , hydroxyethyl cellulose , lyotropic liquid crystal , ionic liquid , phase (matter) , cellulose , lyotropic , chemical engineering , inorganic chemistry , liquid crystal , organic chemistry , liquid crystalline , solvent , chemistry , catalysis , optoelectronics , engineering
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 CaCl 2 , an inorganic salt of a principal group metal, the solution of HECA/DMF/CaCl 2 was a biphasic system. The temperature of the transformation from the liquid crystalline phase to the isotropic one increased with adding CaCl 2 because local HECA concentration increases in the HECA/DMF phase. When CuCl 2 or CoCl 2 , inorganic salts of transitional metals, was added, the solutions were monophasic systems and the complexes of HECA with Cu 2+ or Co 2+ were formed in solutions, which results in the increase of the temperature of the transfomation from the liquid crystalline phase to the isotropic one.