Abstract(Eng)
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A series of aromatic poly(o-hydroxyamide)s (PHAs) were synthesized by the direct polycondensation reaction
of 4,4′-(2,3-quinoxalinedioxy) dibenzoic acid and/or 4,4′-(2,3-pyridinedioxy) dibenzoic acid with bis(o-aminophenol)
including 2,2-bis-(amino-4-hydroxyphenyl)hexafluoropropane. The PHAs exhibited inherent viscosities in the range of
0.17-0.35 dL/g at 35°C in a DMAc solution. These polymers showed low inherent viscosities and yielded brittle films. All
the PHAs showed excellent solubility in aprotic solvents such as DMAc, DMSO, NMP, and DMF at room temperature and
in less polar solvents such as pyridine and THF. However, all the PBOs were only partially soluble in H2SO4. The PBOs
exhibited 10% weight loss at temperatures in the range of 537-551°C. The maximum weight loss temperature increased with
an increase in the content of the quinoxaline-containing monomer. The residue of the PBOs showed a weight loss of 45.8-
56.7% at 900°C in a nitrogen atmosphere.
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