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PA (Polyamide) is a semi-crystalline polymer. There are two types: those made of one basic material (e.g. PA 6) and those made of two basic materials (e.g. PA 66). They can occur both naturally (e.g. wool and silk) and synthetically (e.g. nylon).
The resulting polymers are known as polypeptides or proteins. For the industrial production of synthetic polyamides with at least one aliphatic monomer (nylon polymers), the amide link is produced from the condensation reaction of an amino group and a carboxylic acid group, water is eliminated. For fully aromatic polyamides or 'aramids' e.g.