Polymer and Materials Science
Wiley InterScience Backfile Collection 1832-2000
Chemistry and Pharmacology
The fluorescence behaviour of a lyotropic liquid-crystalline polyester substituted with sulfonato and nitro groups, poly[potassium oxy(x-sulfonato-1,4-phenylene)oxy(x-nitroterephthaloyl)] (1), was studied in various phases by changing the polymer concentration. This liquid-crystalline polymer is soluble in several organic solvents and water. The observed fluorescence is originated from complexes between the potassium sulfonate-substituted aromatic moiety and the nitro-substituted aromatic moiety, and also from the dimer of the potassium sulfonate-substituted moiety. From the results of fluorescence intensity changes with concentration, the change of phase in this lyotropic liquid-crystalline system is suggested to occur gradually. By comparing the fluorescence behaviour in various phases with those of model compounds, the microstructure of the liquid-crystalline state can be evaluated to some extent.
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