Biodegradable materials include polymer materials directly prepared by biotechnology, such as polyhydroxy fatty acid esters (PHA). A class of materials prepared and polymerized by biotechnology, such as polylactic acid (PLA), PBS, polyamino acid, etc. In addition, carbon dioxide copolymer aliphatic polycarbonate (APC) and the like.

       Polyhydroxyalkanoate (PHA), which has been developed rapidly in the past 20 years, is an intracellular polyester synthesized by many microorganisms and a natural polymer biomaterial. Because PHA has good biocompatibility, biodegradability and thermal processing properties of plastics, it can be used as a biomedical material and biodegradable packaging material at the same time, so it has become the most active research in the field of biomaterials in recent years Hot spot.

      Polylactic acid (PLA) is a new type of biodegradable material, made from starch raw materials proposed by renewable plant resources (such as corn). Starch raw materials are saccharified to obtain glucose, which is then fermented by glucose and certain strains to produce high-purity lactic acid, and then a certain molecular weight polylactic acid is synthesized through chemical synthesis. It has good biodegradability. After use, it can be completely degraded by microorganisms in nature, and finally generate carbon dioxide and water without polluting the environment. This is very beneficial to environmental protection and is recognized as an environmentally friendly material.

       Carbon dioxide copolymerized aliphatic polycarbonate is an aliphatic polyester prepared by the polymerization of epoxy compound and carbon dioxide. It has biocompatibility, biodegradability, good toughness and ductility. The polymer can use carbon dioxide and can be biodegradable, which has attracted wide attention.