Chemistry is traditionally divided into organic and inorganic chemistry. The former is the study of compounds containing at least one carbon-hydrogen bonds. 504-02-9, Name is Cyclohexane-1,3-dione, molecular formula is C6H8O2, belongs to benzoxazole compound, is a common compound. In a patnet, author is Han, So Hee, once mentioned the new application about 504-02-9, Safety of Cyclohexane-1,3-dione.
Synthesis and Thermal Properties of Wholly Aromatic Poly(benzoxazole)s
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 degrees 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 degrees 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 degrees C in a nitrogen atmosphere.
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Reference:
Benzoxazole – Wikipedia,
,Benzoxazole | C7H5NO – PubChem