Synthesis and properties of novel aromatic poly(o-hydroxy amide)s and polybenzoxazoles based on the bis(ether benzoyl chloride)s from hydroquinone and its methyl-, tert-butyl-, and phenyl-substituted derivatives

✍ Scribed by Sheng-Huei Hsiao; Liang-Ru Dai

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 187 KB
• Volume: 37
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/(sici)1099-0518(19990701)37:13<2129::aid-pola28>3.0.co;2-o

✦ Synopsis

Four series of poly(o-hydroxy amide)s were prepared by the low-temperature solution polycondensation of the bis(ether benzoyl chloride)s extended from hydroquinone and its methyl-, tert-butyl-, or phenyl-substituted derivatives with three bis(o-aminophenol)s. Most of the poly(o-hydroxy amide)s displayed an amorphous nature, were readily soluble in various polar solvents such as N,N-dimethylacetamide (DMAc), and could be solution-cast into flexible and tough films. These poly(o-hydroxy amide)s had glass transition temperatures (T g ) in the range of 152-185°C and could be thermally cyclodehydrated into the corresponding polybenzoxazoles approximately in the region of 200 -400°C, as evidenced by the DSC thermograms. The thermally converted benzoxazole polymers exhibited T g s in the range of 215-247°C and did not show significant weight loss before 500°C either in nitrogen or in air.