SUMMARY Novel families of aromatic polyamides and poly(amide-imide)s containing $lO-dihydrophenazine-based repeat units were prepared from 5, lo-dihydrophenazine (1) and its diamino-functional derivatives. Basic structure/property relationships and degradation behavior were investigated. Polycondensation of aromatic dicarboxylic acid chlorides with secondary aromatic diamines such as 5,10-dihydrophenaz.ine or its 5,10-bis(trimethylsily1) derivative (3) yielded only oligoaramides. In contrast, 5,10-bis(4aminobenzoyl)-5,10-dihydrophenazine (5) was applied successfully as a new primary aromatic diamine monomer in polycondensations to afford various high molecular weight soluble polyaramides derived from terephthaloyl and isophthaloyl chloride as well as poly(amide-imide)s derived from 6F dianhydrideb. Tough, optically transparent films were prepared by solution casting of 6F poly(amide-imide)s containing 5,10-dihydrophenazine units. In comparison to piperazine units the 5,10-diyhdrophenazine units promote solubility and increase the glass transition temperatures. Reduced thermal and chemical stabilities are attributed to an easy phenazine formation. Polyaramide and poly(amide-imide) films containing 5,10-dihydrophenazine units are photosensitive and were degraded by means of UV irradition and laser ablation.
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