AbstractA series of polyamide‐sulfonamides was synthesized by the interfacial polycondensation ofm‐ andp‐chlorosulfonylbenzoyl chlorides with aliphatic and aromatic diamines at room temperature. Most of the polymers obtained were high molecular weight, film‐forming materials. They were all amorphous and were soluble in a wide range of acidic and basic solvents. Both aliphatic and wholly aromatic polyamide‐sulfonamides showed initial breakdown in the range of 320–360°C under thermogravimetric analysis in a nitroge