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- W2091090169 abstract "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 P2O5 content was optional for this reaction because no water was liberated from the condensation of 1 and 3. © 1997 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 35: 2143–2145, 1997" @default.
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- W2091090169 date "1997-08-01" @default.
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- W2091090169 title "Polybenzoxazole from 1,4-bis(trichloromethyl)benzene" @default.
- W2091090169 doi "https://doi.org/10.1002/(sici)1099-0518(199708)35:11<2143::aid-pola4>3.0.co;2-z" @default.
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