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Polyelectrolyte‐like behavior of polyethylene oxide/LiClO 4 mixture in chloroform or chloroform/dimethylformamide mixed solvent
Author(s) -
Ohno Hiroyuki,
Ito Yasushi,
Yamaguchi Natsue
Publication year - 1991
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/pat.1991.220020501
Subject(s) - chloroform , lithium perchlorate , solvent , dimethylformamide , aqueous solution , viscosity , titration , viscometer , materials science , inorganic chemistry , polymer chemistry , chemistry , organic chemistry , composite material , electrochemistry , electrode
Lithium perchlorate (LiClO 4 ) was dissolved in dehydrated chloroform with polyethylene oxides (PEO) having different molecular weights. The mixing ratio of ether oxygen unit (O) of PEO to cation (Li + ) was set to 20:1. The solution viscosity of the PEO/LiClO 4 mixtures was measured using an Ubbelohde viscometer at 30.0°C. The concentration dependence of the reduced viscosity was analyzed by diluting the initial PEO/LiClO 4 mixed solution with pure chloroform to keep the ratio of Oto Li + constant. The increase in the reduced viscosity for a dilute solution was found in every mixture system, but not in the PEO solution without salt. Similar experiments were also carried out in chloroform/dimethylformamide (DMF) mixed solvent (4:1 by volume). These results were analyzed using the Fuoss equation, which was applied for the analysis of a polyelectrolyte aqueous solution. Linear relations are depicted in the Fuoss plots, suggesting that the PEO/LiClO 4 mixture shows polyelectrolyte‐like behavior in chloroform or in chloroform/DMF mixed solvent. This is attributed to the intramolecular electrostatic repulsion of lithium cations which are trapped by the PEO chains through ion–dipole interaction.