Polyester Chemistry
 Polyester is a type of polymer that contain the ester functional group in the main chain. There are many different polyesters. Polyesters include chemicals found in nature, such as in the cutin of plant cuticles, as well as synthetics through step-growth polymerization such as polycarbonate and polybutyrate. Natural polyesters and a few synthetic ones are biodegradable. But most synthetic polyesters are not biodegradeable.