Aliphatic Polyamides

• A polyamide is a polymer containing monomers of amides joined by peptide bonds. 
• They can occur both naturally and artificially, examples being proteins, such as wool and silk, and can be made artificially through step-growth polymerization or solid-phase synthesis, examples being nylons, aramids, and sodium poly(aspartate).
• According to composition of their main chain, polyamides are classifieds as aliphatic, semi-aromatic and aromatic. Examples of Aliphatic type polyamides are PA6(Nylon 6) and PA 66(Nylon 6,6).
• Nylon 6 is used as thread in bristles for toothbrushes, surgical sutures, and strings for acoustic and classical musical instruments, including guitars, violins, violas, and cellos.