Abstract
Abstract The synthesis and liquid crystal behavior of new thermotropic polyurethanes derived from different mesogenic diols, alkylene di[4-(ω-hydroxyalkyloxy-4-oxybenzoyI)oxybenzoate]s, and 2,4-toluenediiso-cyanate are reported. Depending upon the chemical structure of the repeat unit, the polyurethanes formed either one or two mesophases extending over a fairly broad (>60 K) and accessible range of temperature (T, < 430 K). A cybotactic nematic mesophase was identified in each polyurethane sample.
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