100% Biodegradable Polyhydroxybutyrate PHB

Since PHB was discovered in B. megaterium in 1925, its existence has been confirmed in more than 60 genera of bacteria, such as Alcaligenes (Alcaligenes), Azotobacter (Azotobacter) and Pseudomonas (pseudomonas). Spp.), etc. In some G+ and G- bacteria, as well as some photosynthetic anaerobes and chemoautotrophic Rastonia eutropha (Rastonia eutropha), a variety of compounds similar to PHB have been found, collectively called polyhydroxy chains Alkanoic acid (or polyhydroxyalkanoate, PHA), the difference between them and PHB is only on the methyl group, if the methyl group is replaced by R (abbreviation for radical, refers to a certain group), then Become PHA. As PHB and PHA are biosynthetic polymers, which are non-toxic, plastic and easily degradable, they are vigorously developing high-quality raw materials for the manufacture of medical plastic boxes, fast food boxes, etc., and are trying to overcome the current serious harm "White pollution" (refers to environmental pollution caused by a large number of non-degradable plastic packaging materials and products).
PHB is a thermoplastic polyester, and its physical properties and structure are similar to polypropylene (melting point, glass temperature, crystallinity, tensile strength, etc.). The chemical structure is regular. The crystallinity is as high as 60~80%, the relative density is high, the oxygen permeability is low, it is resistant to ultraviolet radiation, and has optical activity, but it is brittle and easy to break.