polyhydroxybutyrate (phb) biodegradable plastic, chemical structure. polymer that is both bio-derived and compostable

polyhydroxybutyrate polyester butyric butyrate hydroxybutyrate phb polyhydroxyalkanoate pha alkanoate bioderived biodegradable p3hb poly3hydroxybutyrate ralstonia eutrophus bacillus megaterium carbon hydrogen oxygen compostable green chemistry suture polymer plastic monomer molecule atoms atomic model molecular synthetic structure strand particle