| Abstract: | Thermally stable polyamides were prepared by reaction of aromatic diamines with pyrrolidone dicarboxylic acids obtained by reaction of itaconic acid with aromatic diamines. The reaction was carried out either by melt poly-condensation or by converting the diacids to their active mixed anhydrides and reacting them with the diamines. Polybenzimidazoles were prepared by melt polymerization of the pyrrolidone dicarboxylic acids with 3,3′-diamino-benzidine. All the polymers were soluble in concentrated sulfuric acid and part of them were also partially soluble in DMF or DMSO. DTA and TGA measurements in air showed that the polyamides were stable up to about 400° and the polybenzimidazoles were stable to 500°. |
