Material Introduction: Polyamide or Nylon is the major engineering and high performance thermaplastic class because of its good balance of properties. Polyamides contain repeating amide linkages i.e. –CO-NH–. It is formed by condensing identical units, copolymers for different units.
Polyamides (or Nylon) are made from polycondensation of diacid with a diamine or by ring-opening polymerization of lactams with 6, 11 or 12 carbon atoms.
- The monomers may be aliphatic, semi-aromatic or aromatic (aramids)
- They may be amorphous, semi-crystalline and of greater or lesser crystallinity