Plastics made of polyamide resin. This resin can be prepared by condensation polymerization of diamine and dibasic acid, or by ring-opening polymerization of lactam formed by dehydration of amino acids. The molecular formula is: NH (CH2) mnhc0 (CH2) n-2c0nh (CH2) n-1c0npa, which is mainly used for household electrical components such as plugs and wires, electronic and electromechanical products, and also used for producing parts and sporting goods in automobiles and meters. Unlike PS, PE, PP, etc. PA does not soften gradually with the increase of heating temperature, but softens in a narrow temperature range close to the melting point. The melting point is obvious and it will flow once it reaches the temperature.
Polyamide resin is a kind of polycondensation polymer with CONH structure in its molecule, which is usually formed by polycondensation of diacid and diamine.