Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx) is a natural biological polyester material that belongs to the polyhydroxyalkanoate (PHA) family.Compared with other, well-established PHA family members,poly(3-hydroxybutyrate) (PHB) and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV), PHBHHx has better biodegradability and mechanical properties. PHBHHx has excellent biocompatibility with a variety of cell types, including smooth muscle cells , fibroblasts
, articular cartilage-derived chondrocytes , osteoblasts, and bone marrow cells . Additionally,PHBHHx possesses a low degree of crystallinity (2).Polyhydoxyalkanoates are generally biodegradable and thermoprocessable and thus have been widely used in both conventional medical devices and tissue engineering.Because of its good biocompatibility