Abstract
We synthesized regioregular liquid crystalline polythiophene (PTh) derivatives by chemical oxidative polymerization using iron trichloride to investigate the effect of the regioregularity on their physical properties. The regioregularity was about 90% for the PTh derivatives. A smectic phase was observed for two PTh derivatives. Plural peaks based on vibronic coupling characteristic of the regioregular PTh derivatives were observed in the π–π* transition absorption band of the UV-vis spectra. The vibronic coupling disappeared with increasing temperature and a new peak assigned to the PTh derivatives with non-planar conformation for the polymer backbone was observed in shorter wavelength range. The electrical conductivity was about 10-3–10-4 S cm-1 for the PTh derivatives doped with I2 vapor in the film state.
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Kohno, H., Saitoh, F., Mihara, T. et al. Thermal and Optical Properties of Regioregular Polythiophene Derivatives Containing Mesogenic Group in the Side Chain. Polym J 35, 945–950 (2003). https://doi.org/10.1295/polymj.35.945
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DOI: https://doi.org/10.1295/polymj.35.945