Elastomers and Composites

The Rubber Society of Korea (한국고무학회)
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Synthesis and Thermal Properties of Wholly Aromatic Poly(benzoxazole)s

  • Han, So Hee (Dept. of Biochemical & Polymer Engineering, Chosun University) ;
  • Lee, Eung Jae (Dept. of Bioenvironmental & Chemical Engineering, Chosun College of Science & Technology) ;
  • Choi, Jae Kon (Dept. of Biochemical & Polymer Engineering, Chosun University)
  • Received : 2018.07.16
  • Accepted : 2018.07.31
  • Published : 2018.09.30
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Abstract

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 $35^{\circ}C$ 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 $H_2SO_4$. The PBOs exhibited 10% weight loss at temperatures in the range of $537-551^{\circ}C$. 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 $900^{\circ}C$ in a nitrogen atmosphere.

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