Preparation and properties of polyamides from 4‐phenoxy‐ and 4‐phenylthio‐m‐phenylenediamine and both aromatic and aliphatic diacids

New soluble aramids having pendant phenoxy and phenylthio groups were prepared in high molecular weights by the polycondensation of aromatic diacids with 4‐phenoxy‐m‐phenylenediamine and 4‐phenylthio‐m‐phenylenediamine, respectively. Glass transition temperatures (Tg) of these aramids were in the range 195–255°C, where Tgs of phenoxy pendant aramids were higher than those of phenylthio substituted aramids. These properties were compared with those of the parent aramids derived from m‐phenylenediamine and aromatic diacids. Aromatic‐aliphatic polyamides were also prepared by the reaction of these three diamines with aliphatic diacids having 4–10 methylene groups and were characterized in detail.