Bio-based plastics refer to plastics that are directly synthesized from organisms (including animals, plants and microorganisms) or other renewable resources (such as carbon dioxide) (such as polyhydroxyalkanoates (PHA, including PHB, PHBV, etc.)). Polymer material. Or polymer materials with plastic characteristics, which are made of natural polymers or biopolymers (starch, cellulose, chitin, lignin, proteins, polypeptides, polysaccharides, nucleic acids, etc.).
Or obtained from its structural units or derivatives through biological or chemical means. Or mixtures or compounds with these polymer materials as the main component, such as polylactic acid, polyamino acid, thermoplastic starch, starch-based plastics, plant fiber membrane plastic products, modified cellulose, modified protein, bio-based polyamide, carbon dioxide copolymer Things, etc.
When certain bio-based polymer materials have certain special functions, they are usually called bio-based polymer materials. Special functions and uses include drug loading or targeted delivery, slow release or controlled release, pesticide, fertilizer and herbicide loading, slow release or controlled release, adsorption and flocculation of pollutants and poisons, and medical treatment for human tissue and organ repair Polymer materials or functional regeneration, artificial plasma or artificial blood, hemodialysis materials, etc.
The response to external stimuli includes changes in living space and shape, changes in cross-linking degree, changes in chemical structure, changes in water absorption, changes in dissolution or condensation conditions, etc.