Kobzar Y. Synthesis, structure and properties of isomeric polyazomethines containing perfluorinated mono- and biphenylene cores

The thesis is devoted to the synthesis of new core-fluorinated bifunctional azomethine-containing monomers of nucleophilic and electrophilic nature and isomeric core-fluorinated polyazomethines (FPAMs) with perfluorinated mono- and biphenylene fragments synthesized by the traditional and alternative approaches. Main results were obtained with use of research methods: IR-, NMR-, UV-spectroscopy, viscometry, gel permeation chromatography, wide- and small-angle X-ray analysis, differential scanning calorimetry, thermogravimetric analysis, polarization-optical microscopy. It was shown that the introduction of non-coplanar octafluorobiphenylene aromatic rings and meta-phenylene fragments into polymers' chain enhances their solubility and intrinsic viscosity. The obtained FPAMs synthesized via the alternative approach are characterized by improved of the molecular-mass characteristics as compared with FPAMs synthesized via the traditional approach. The synthesized FPAMs have different structural organization (from crystalline to amorphous), and according to TGA data they are thermostable up to 350 oC. Polarization microscopy techniques allowed investigation of liquid crystals (LC) phases after long-term relaxation of the materials and achieving of the equilibrium in them. The synthesized FPAMs exhibit a well pronounced thermotropic LC behavior. Therefore, the obtained polymers are able to rotate the plane of polarization of polarized light.