New Processable Polyaromatic amides were prepared from 2,2′‐diiododiphenyl‐4,4′‐dicarbonyl dichloride (I) and several aromatic diamines. Phenylethynyl groups were introduced in these polymides by replacing the iodine groups with copper phenyl acetylide. On thermal curing, 2,2′‐di(phenylethynyl)biphenyl group undergoes intramolecular cyclization to form 9‐phenyl dibenzanthracene derivative. The cured polymers showed increased heat and chemical stabilities. No melting points were observed for all the polymers below 500°C. The viscosity of the polymers was decreased on substitution of the iodine by phenylethynyl groups.
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Sankaran et al. (1980) studied this question.
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