中文摘要：

聚（3-羟基丁酸-co-4-羟基丁酸酯）[P（3HB-co-4HB）]是一种新型可生物降解高分子材料.综述了近年来P（3HB-co-4HB）在改性方面的研究进展情况,涵盖了扩链、交联、接枝等化学改性以及成核、增塑、共混等物理改性.同时对P（3HB-co-4HB）相关研究中存在的问题进行了分析并对其在未来的发展应用作出了展望.

英文摘要：

Poly（3-hydroxybutyrate-co-4-hydroxybutyrate）[P（3HB-co-4HB）] is a kind of new biodegradable plastic. The modification progress of P（3HB-co-4HB） was introduced,which mainly covers chemical modification such as chain modification, graft modification,and radiation crosslinking modification and physical modification of nucleation,plasticizing,blending modification and so on. The problems of P（3HB-co-4HB） research were also analyzed and the future development of P（3HB-co-4HB） was discussed.