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A comparative analysis of the structure of thermotropic liquid-crystalline boron-containing copolyethers and their organic analogs

Temperature variation of the structure of recently synthesized copolyesters, where (in contrast to the fully organic analogs) a columnar mesophase having a two-dimensional pseudohexagonal packing of the conformationally disordered chains was observed for the first time, was studied by X-ray diffraction and DSC. The copolyesters of different composition were studied in the form of cold-pressed isotropic powders having a nascent structure, and annealed samples. It was found that variation of the chemical structure allows different types of the ordered forms known in polymers to be observed according to the scheme: crystal-S H LC smectic-columnar mesophase-S C LC smectic-LC nematic-isotropic melt.