Experimental investigation on the thermal resistance of thermotropic aromatic oligoesters

Synthesis and characterization of liquid crystalline polymers based on 4-hydroxybenzoic acid, aromatic dibasic acids, and aromatic diols via a high-temperature polycondensation are described. FT-IR spectroscopy was employed to evaluate a molecular weight of the samples that can be considered as oligoesters. The mesophase existence ranges of the samples were estimated by means of DSC and optical polarizing microscopy. Liquid crystalline oligoesters offer excellent thermal (T0 = 250-373 °C) properties. The macromolecules obtained contain reactive terminal groups and retain the ability to grow at elevated temperatures.