Sj. Zhang et al., EFFECT OF CRYSTAL-DISRUPTING CHLOROHYDROQUINONE ON THE FIRST-ORDER TRANSITIONS OF POLY(ARYL ETHER KETONE)S CONTAINING BIPHENYL UNITS, Macromolecular rapid communications, 18(8), 1997, pp. 729-732
The novel poly(aryl ether ketone)s were synthesized by nucleophilic su
bstitution reactions of 4,4'-difluorobenzophenone with 4,4'-biphenyldi
ol and chlorohydroquinone. As expected, the copolymers have lower melt
ing transitions than the biphenyldiol-based homopoly(aryl ether ketone
) because of the copolymerization effect of the crystal-disrupting mon
omer chlorohydroquinone. Copolymers containing 50 and 70% biphenyldiol
show two first-order transitions which are associated with the crysta
l-to-liquid crystal transition and the liquid crystal-to-isotropic tra
nsition.