RELATIONSHIP BETWEEN MOLECULAR-STRUCTURE AND THERMAL-PROPERTIES OF POLY(ARYL ETHER KETONE)S

Five kinds of poly(aryl ether ketone)s (PAEKs) having para-substituted linear molecular chains were synthesized via nucleophilic substitutio n reaction of the corresponding difluoro- and dihydroxy-compounds. The glass transition temperature and melting temperature of the PAEKs mea sured through differential scanning calorimetry in addition to those o f other PAEKs reported are approximately proportional to the logarithm of the ratio of the mole fractions of ketone and ether groups in the repeating unit of the PEAKs. On the other hand, this ratio does not af fect the crystal structure of the PAEKs.