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Natural fiber(NF) reinforced poly (lactic acid) (PLA) composites have received a lot of research attention because of their excellent biodegradablity.However with the addition of the flame retardancy, the properties of the composites such as the mechanical properties are greatly decreased.Poly (butylenes adipate-co-terephthalate) (PBAT) is an aliphatic-aromatic copolyester, which is fully biodegradable.In the view of its high toughness and biodegradability, PBAT is considered as a good candidate for the toughening of PLA matrix.