Optimizing interfacial compatibility is one of the core issues for constructing high-performance green poly(lactic acid) (PLA) blends. Herein, we prepared a poly(epichlorohydrin)-b-poly(d-lactic acid) (PECH-b-PDLA) diblock copolymer as an efficient compatibilizer for poly(l-lactic acid)/poly(epichlorohydrin) (PLLA/CHR) blends. The PECH-b-PDLA enabled the blends to form unique interlocks among the chains through combining the strong dipolar interaction and PLLA/PDLA stereocomplexation (SC). This strategy endows the PLLA/CHR blend with a unique “co-continuous” structure composed of CHR particles as the core and a bilayer shell formed by the PECH entanglement layer with strong dipolar interaction and a rigid SC thin layer. Physical properties of the blends were remarkably improved by a co-continuous structure with enhanced interfacial adhesion between phases. The optimum formulation showed unprecedented balanced mechanical properties: a nonbroken sample with an impact strength of 106.7 kJ/m² and a high elongation at break of up to 467.2%; both were about 40 times those of pure PLLA. The interlocking mechanism through strong dipolar interaction and SC provides a broadly applicable and facile strategy to achieve PLA materials with superior properties for expanded industrial application.

中文翻译：

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通过结合强偶极相互作用和立体络合的新型联锁策略，完全基于生物和超韧 PLA 共混物

优化界面相容性是构建高性能绿色聚乳酸 (PLA) 共混物的核心问题之一。在此，我们制备了一种聚（表氯醇）-b-聚（d-乳酸）（ PECH- b - PDLA）二嵌段共聚物作为聚（l-乳酸）/聚（表氯醇）（PLLA/CHR）的高效相容剂。混合。PECH- b-PDLA通过结合强偶极相互作用和PLLA/PDLA立体络合(SC)，使共混物在链之间形成独特的互锁。该策略赋予 PLLA/CHR 混合物以独特的“共连续”结构，由 CHR 粒子作为核心和由具有强偶极相互作用的 PECH 纠缠层和刚性 SC 薄层形成的双层壳组成。共连续结构显着改善了共混物的物理性能，增强了相间的界面粘合力。最佳配方显示出前所未有的平衡机械性能：冲击强度为 106.7 kJ/m ^{2的完整样品}断裂伸长率高达 467.2%；两者都是纯 PLLA 的约 40 倍。通过强偶极相互作用和 SC 的联锁机制提供了一种广泛适用且简便的策略，以实现具有卓越性能的 PLA 材料，以扩大工业应用。