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Polyesters, the group of plastics that PET (also called polyethylene terephthalate) belongs to, do occur in nature. "They protect plant leaves," explained the University of Portsmouth researcher.

Biodegradable polymeric materials are dominated by polymers which contain hetero-atoms in their main chains. Chemical bonds such as ether-bonds, amide-bonds or ester-bonds are susceptible for ...

Polyesters occur naturally as biological polymers, but can also be made artificially. Man-made polymers are often used in clothing. Polyesters are an example of a condensation polymer. A simple ...