The creation of high-performance polylactic acid (PLA) materials combining excellent mechanical robustness and flame-retardant performances are essential to meet demanding performances requirements for their practical applications in industry. Despite encouraging advances, current strategies by introducing toughening agents and flame retardants usually show compromised mechanical strength/ductility because of the irrational interphase reaction design of multi-component polymer blends. To date it remains challenging to robust and flame-retardant PLA via controlling interphase reactions. We, herein, report the rational design of mechanically robust and flame-retardant PLA by in situ manipulating interphase reactions between PLA, epoxidized soybean oil (ESO), a biobased and inexpensive toughening agent, and ammonia polyphosphate (APP), an effective eco-friendly flame retardant. We show that in addition to a high tensile strength of 42.0 MPa, as-designed PLA/ESO/APP ternary blend exhibits a high extensibility of 165% and a fracture toughness as high as 46 MJ/m³, which are respectively 21 and 14 folds of that of the bulk PLA. Meanwhile, a desired V-0 rating and a high limited oxygen index of 30.2% are achieved. Such outstanding performance portfolios are enabled by the rational manipulation of interphase reactions, leading to the in situ formation of favorable phase structures. This work offers an innovative methodology for facilely and massively creating high-performance multi-component polymer blends by tailoring interphase reactions, and contributes to expanding the extensive applications of PLA.

结合优异的机械强度和阻燃性能而创建的高性能聚乳酸（PLA）材料对于满足其在工业中的实际应用的苛刻性能要求至关重要。尽管取得了令人鼓舞的进展，但是由于多组分聚合物共混物的不合理的相间反应设计，目前引入增韧剂和阻燃剂的策略通常显示出不利的机械强度/延展性。迄今为止，通过控制相间反应对坚固耐用的PLA仍然具有挑战性。我们在此报告了通过现场就机械强度和阻燃性PLA进行的合理设计操纵PLA与环氧化大豆油（ESO）（一种生物基廉价的增韧剂）和一种有效的环保阻燃剂聚磷酸氨（APP）之间的相间反应。我们显示，除42.0 MPa的高抗拉强度外，按设计设计的PLA / ESO / APP三元共混物还具有165％的高延展性和高达46 MJ / m ³的断裂韧性，分别为21和14是大批PLA的几倍。同时，获得了所需的V-0额定值和30.2％的高极限氧指数。通过合理地控制相间反应，实现了如此出色的性能组合，从而实现了原位形成有利的相结构。这项工作提供了一种创新的方法，可通过定制相间反应轻松而大规模地创建高性能的多组分聚合物共混物，并有助于扩大PLA的广泛应用。