Interfacial polycondensation. VI. Polyamides based on 4,4′‐sulfonyldibenzoic acid

Abstract

Abstract The preparation of eleven soluble polyamides based on 4,4′‐sulfonyldibenzoic acid by interfacial polycondensation with the use of aliphatic and alicyclic diamines is reported. Polymer melt temperatures of those polyamides prepared from aliphatic diamines decreased with increasing chain length and amount of chain branching in the diamine. The usual odd‐even alternation of melting points was noted. Cyclic secondary diamines gave higher‐melting polyamides than straight‐chain diamines, despite the lack of hydrogen bonding. Solubility decreased with increasing melting point, except for the polyamides based on cyclic diamines, which were both soluble and high‐melting. Fiber properties are reported for those polymers which were spun.