MESOMORPHIC PROPERTIES OF SIDE-CHAIN TYPE LIQUID-CRYSTALLINE COPOLYESTERS WITH POLAR AND NONPOLAR GROUPS IN THE END OF THE MESOGEN

Side chain type liquid crystalline copolyesters containing alternative polar and non-polar mesogenic end groups were synthesized. Furthermor e, side chain type liquid crystalline copolyester with a random sequen ce of the polar and non-polar mesogenic end groups was also prepared. The induced smectic phase was exhibited for the copolyester containing alternate polar and non-polar mesogenic end groups in the side chain. The mesomorphic temperature range was influenced by the sequence of t he mesogen with the polar or non-polar group. Further, the thermal pro perties of the mixture of copolyesters with polar and non-polar end gr oups were investigated. A mixture of 10-50 mol% of copolyesters with p olar end groups exhibited an induced smectic phase.