High-performance polyhydroxyalkanoate as well as preparation method and application thereof

The invention provides high-performance polyhydroxyalkanoate which comprises a polyhydroxyalkanoate chain segment and a copolyester chain segment of a first chain extender, and the first chain extender is selected from polyol. The preparation method of the high-performance polyhydroxyalkanoate comprises the following steps: continuously reacting and extruding components including the polyhydroxyalkanoate and the first chain extender to obtain the high-performance polyhydroxyalkanoate. The prepared high-performance polyhydroxyalkanoate, the compound polymer and other auxiliaries are further melted and mixed in a double-screw extruder to prepare blended particles, film blowing is carried out, the melt index of PHA subjected to continuous reaction extrusion modification is remarkably reduced, the molecular weight is increased, and the mechanical property of the prepared modified PHA-PBAT film is improved. 本发明提供一种高性能聚羟基脂肪酸酯，包含有聚羟基脂肪酸酯链段、第一扩链剂的共聚酯链段，其中所述的第一扩链剂选自多元醇。本发明所述高性能聚羟基脂肪酸酯的制备包括将包含有所述的聚羟基脂肪酸酯、第一扩链剂在内的组分连续反应