Nylon™ is the trade mark of the first polyamide synthesized in the USA in 1935.

Polyamides are prepared (a) by condensation of diacids or their derivatives and diamines; (b) by selfcondensation of amino acids or by ring opening polymerisation of lactams. The corresponding chain repeat units are :
Applications of polyamides, both as fibers and as engineering thermoplastics, include automobile industry, packaging films, electronics, biomedical devices, clothing, carpets.