The stiffness-toughness balance of polymeric materials poses great challenges. Acrylonitrile–butadiene–styrene terpolymer (ABS) exhibits excellent mechanical and processing properties due to its unique “salami” morphologies. Inspired by this, we proposed a three-step reactive processing strategy to design high performance polylactide (PLLA) composites with the similar “sub-inclusion” microstructure. The reactive micro-crosslinked elastomer with bifunctional groups (RMCE) was first prepared by the blending of γ-aminopropyl-triethoxysilane (KH550) with the random copolymer of ethylene-acrylic ester-glycidyl methacrylate (EGMA). The following mixing of the minor PLLA with the RMCE leads to the double-ended fixing of polylactide molecular chain in the RMCE. The PLLA included reactive micro-crosslinked elastomers (IRCE) were then used to toughen PLLA, inducing the formation of PLLA alloys with the unique sub-inclusion morphology. Surprisingly, magnificent stiffness-toughness balance can be achieved for the obtained PLLA composites. This work opens up a new strategy for preparing high-performance polyester composites with excellent stiffness-toughness balance.

高分子材料的刚度-韧性平衡提出了巨大的挑战。丙烯腈-丁二烯-苯乙烯三元共聚物（ABS）由于其独特的“萨拉米”形态而表现出优异的机械和加工性能。受此启发，我们提出了一种三步反应加工策略来设计具有类似“子夹杂物”微观结构的高性能聚丙交酯（PLLA）复合材料。首先通过γ-氨丙基三乙氧基硅烷(KH550)与无规共聚物共混制备了双官能团反应性微交联弹性体(RMCE)。乙烯-丙烯酸酯-甲基丙烯酸缩水甘油酯(EGMA)的共聚物。随后将少量 PLLA 与 RMCE 混合，导致 RMCE 中聚丙交酯分子链的双端固定。然后使用含有反应性微交联弹性体 (IRCE) 的 PLLA 来增韧 PLLA，从而诱导形成具有独特的子夹杂物形态的 PLLA 合金。令人惊讶的是，所获得的 PLLA 复合材料可以实现出色的刚度-韧性平衡。这项工作开辟了制备具有优异刚度-韧性平衡的高性能聚酯复合材料的新策略。