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Polybenzoxazole from 1,4-bis(trichloromethyl)benzene

✍ Scribed by Ying-Hung So

Publisher: John Wiley and Sons
Year: 1997
Tongue: English
Weight: 95 KB
Volume: 35
Category: Article
ISSN: 0887-624X
DOI: 10.1002/(sici)1099-0518(199708)35:11<2143::aid-pola4>3.0.co;2-z

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✦ Synopsis

High molecular weight poly(phenylenebenzobisoxazole) (PBO) was synthesized from 1,3-diamino-4,6-dihydroxybenzene dihydrochloride ( 1) and 1,4-bis(trichloromethyl)benzene ( 3) in polyphosphoric acid (PPA) or a mixture of PPA and methanesulfonic acid. When PPA was used as the solvent, 3 was first converted in situ to terephthalic acid before 1 was added to minimize degradation of 1. Compound 3 did not need to be sealed from atmospheric moisture because the trichloromethyl groups were not moisture sensitive. It was not necessary to use micronized 3. Adjustment of P 2 O 5 content was optional for this reaction because no water was liberated from the condensation of 1 and 3.

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