Abstract
ABSTRACTAn influence of a flexible spacer length on a formation of mesomorphic phases in two classes of organosiliconpolymers with different backbones but the same mesogenic rigid core has been investigated by X-ray diffractionmeasurements completed by differential scanning calorymetiy and optical microscopy. Depending on the spacer length,these materials form nematic or/and smectic A1 phases. The nematic phase with smectic C-like short range ordering was observed for the cyclosiloxanes. The dependence of the layer spacing in the smectic phase on the siloxane ring size was alsoinvestigated.Keywords: side chain polymers, liquid czystals, X-ray diffraction, nematic, smectic, cybotactic groups 1. INTRODUCTIONUp-to-date physics and chemistzy of polymeric liquid crystals is an intensively developing field of polymer science.Based on the chemical structure of macromolecules, thermotropic liquid ciystalline (LC) polymers can be divided into two groups: linear polymers containing alternating rigid and flexible fragments in the backbones and comb-like polymers
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