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블릿 Title(Kor) *
블릿 Title(Eng) Synthesis and Thermal Properties of Wholly Aromatic Poly(benzoxazole)s
블릿 Keyword poly(o-hyroxyamide)s, poly(benzoxazole)s, thermal cyclization, solubility, direct polycondensation reaction
블릿 Author(Kor) *
블릿 Author(Eng) So Hee Han, Eung Jae Lee*†, and Jae Kon Choi†
블릿 Date 2018.09.30
블릿 Attach file 5 141-149최재곤.pdf
블릿 Page Page. 141~149
블릿 Abstract(Kor)
*
블릿 Abstract(Eng)
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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