Fluorescence study of the microstructure of a lyotropic liquid-crystalline polyester substituted with sulfonato and nitro groups
✍ Scribed by Hiromitsu Takahashi; Kazuyuki Horie; Takashi Yamashita; Shinjiro Machida; David T. B. Hannah; David C. Sherrington
- Publisher
- John Wiley and Sons
- Year
- 1996
- Tongue
- English
- Weight
- 442 KB
- Volume
- 197
- Category
- Article
- ISSN
- 1022-1352
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✦ Synopsis
Abstract
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.