Introduction: 

Nylon is a general designation of a type of synthetic polymer. It is a thermoplastic material that can be melt-processed to different structure. It was the first commercially successful polymer. It was synthesized by DUpont and the first commercial synthesized nylon was nylon(6,6) by Wallace brothers. Nylon was first commercially used in a nylon-bristled toothbrush in 1938. Later it got famous because of use in ladies stockings which were sold commercially in 1940. Nowadays it has many different areas of applications like fabrics, fibers, films etc. 
Nylon is made of repeating unit linked by peptide bonds. Nylons are made by reacting acid-amines or diacid-diamines. Nylon polymers can be mixed with different other polymers to generate different properties of material though nylon was basically marketed as durable and indestructible material.   

Chemical procedure:

Nylon has many repeating chains consisting of carbon atoms. There are various type of nylons depending on the chains. 

Nylon-6,6

Nylon-6,6 is made from two monomers each of which contain 6 carbon atoms - hence its name. One of the monomers is a 6 carbon acid with a -COOH group at each end - hexanedioic acid(HOOC-CH2-CH2-CH2-CH2-COOH). The other monomer is a 6 carbon chain with an amino group, -NH2, at each end. This is 1,6-diaminohexane (also known as hexane-1,6-diamine - H2N-CH2-CH2-CH2-CH2-CH2-CH2-NH2). When these two compounds polymerize, the amine and acid groups combine, each time with the loss of a molecule of water. This is known as condensation polymerization. Condensation polymerization is the formation of a polymer involving the loss of a small molecule. In this case, the molecule is water, but in other cases different small molecules might be lost.