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Novel semi-rigid thermotropic liquid-crystalline (LC) polyesters containing terphenyl analogue of 1,3,4-thiadiazole in the main chain were synthesized by melt polycondensation of a dioxydiundecanol derivative of 2,5-diphenyl-1,3,4-thiadiazole with four aromatic diesters, and their structures were confirmed from FTIR, 13C NMR spectra and elemental analyses. Differential scanning calorimetry (DSC) measurements and polarizing microscope observations of textures showed that all the polymers form enantiotropic LC (smectic) phases. UV-vis and photoluminescence (PL) spectra indicated that polyesters without nitro groups display maximum absorbances arising from 1,3,4-thiadiazole moiety and blue-emission maxima, the Stokes shifts being 69.5–79 nm in solution and 54–97 nm in the solid state.
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Sato et al. (2000) studied this question.
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