Abstract
AbstractPolyisophthalamides and polyterephthalamides were prepared by the solution polycondensation of the corresponding diacyl chlorides with 4,4′‐diaminobibenzyl, trans‐4,4′‐diaminostilbene, and 4,4′‐diaminotolan in N,N‐dimethylacetamide (DMAc). Polypyromellitimides were synthesized in two steps by the ring‐opening polyaddition of pyromellitic dianhydride with the aromatic diamines in DMAc, followed by thermal cyclodehydration. The amorphous polyisophthalamides were soluble in some amide solvents containing lithium chloride, while the polyterephthalamides having fair degree of crystallinity were insoluble in these solvents. The thermal stability of these aromatic polymers decreased in the order of the tolan‐containing polymers > the stilbene‐containing polymers > the bibenzyl‐containing polymers, both in air and under nitrogen.
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