THE SYNTHESIS AND THERMOTROPIC LIQUID-CRYSTALLINE BEHAVIOR OF THE NOVEL POLY(ARYL ETHER KETONE)S CONTAINING CHLORO-SIDE GROUP

The novel poly(aryl ether ketone)s containing chloro-side group were s ynthesized by nucleophilic substitution reactions of 4,4'-biphenol and chlorohydroquinone with either 4,4'-difluorobenzophenone(BP/CH/DF) or 1,4-bis(p-fluorobenzoyl)benzene (BP/CH/BF) and their thermotropic liq uid crystalline properties were characterized by a variety of experime ntal techniques. The thermotropic liquid crystalline behavior was obse rved in the copolymers containing 50 and 70% biphenol. Melting transit ion (Tm) and isotropization transition (Ti) both appeared in the DSC t hermograms. A banded texture was formed after shearing the sample in t he liquid crystalline state. The novel poly(aryl ether ketone)s had re latively higher glass transition temperature (Tg) in the range of 168 similar to 200 degrees C and lower melting temperature (Tm) in the ran ge of 290 similar to 340 degrees C. The thermal stability (Td) was in the range of 430 similar to 490 degrees C.