polyamidiyhdisteet
Polyamidiyhdisteet, commonly known as polyamides, are a class of polymers characterized by the presence of amide linkages in their backbone. The general formula for the repeating unit is -[NH-R-NH-CO-R'-CO]-, where R and R' are generally alkyl groups. These linkages are formed through a polymerization reaction between diamines and dicarboxylic acids, or through the ring-opening polymerization of lactams. Polyamides are a significant group of engineering plastics due to their excellent mechanical properties, including high tensile strength, toughness, and abrasion resistance. They also exhibit good thermal stability and chemical resistance, particularly to oils and solvents.
The most well-known polyamides are nylon 6,6, synthesized from hexamethylenediamine and adipic acid, and nylon 6,