STUDIES ON THERMOTROPIC LIQUID-CRYSTALLINE POLYMER .11. EFFECT OF AMIDE GROUP ON THERMOTROPIC LIQUID-CRYSTALLINE POLYMER PROPERTIES

A series of poly (azomethine) s containing amide, ether, or ester groups was prepared by the condensation of dialdehydes with various diamines. The thermotropic liquid crystalline properties were examined by DSC and microscopic observations. The effects of the number and position of amide groups, which are attached to the rigid segment, on the thermotropic liquid crystalline properties of the homo- and copoly (amide-azomethine-ether) s were also investigated in this study. The copolymerization took place by changing the amount of amide group to obtain copoly(amide-azomethine) (P13 and P14) which exhibit thermotropic liquid crystalline properties. The poly(azomethine)s containing ether or ester groups also exhibited thermotropic liquid crystalline properties.