THE SYNTHESIS AND CHARACTERIZATION OF THE NOVEL POLY(ARYL ETHER KETONE)S WITH LIQUID CRYSTALLINITY

The novel poly(aryl ether ketone)s with liquid crystallinity were synt hesized by nucleophilic substitution reactions of 4,4'-biphenol and su bstituted hydroquinone with 4,4'-difluorobenzophenone and their thermo tropic liquid crystalline properties were characterized by DSC, PLM an d WAXD, The copolymers containing 70% biphenol formed nematic phase wh ile the copolymer containing 50% biphenol exhibited smectic texture, T he banded textures were formed after shearing the sample in the nemati c liquid crystalline state. The identification of the structures in ea ch mesogenic phase has been carried out by combining WAXD with PLM and DSC.