Balanced electrical conductivity and mechanical properties are always of great significance for the practical applications of conductive polymer composites (CPCs), especially for the inherent brittle poly(lactic acid) (PLA)-based CPCs. Herein, the phase control methodology (i.e. carbon nanotubes (CNTs) and intense extensional flow field synergistically induced PLA crystallization) was proposed to achieve the in situ electrically conductive nanohybrid shish that is composed of plenty of CNTs coated by PLA crystalline phase. In addition, the conductive networks were easily constructed by the combined effect of 1 D wire-like conductive nanohybrid shish and 2 D patch board-like graphene (GE) for highly conductive PLA/CNT/GE nanocomposites. Compared with common pure PLA (4.2×10^-12 S/cm), the electrical conductivity of PLA/CNT5/GE0.1 (1.32 S/cm) was sharply increased by 12 orders of magnitude. Meanwhile, due to the strong reinforcing effects of nanohybrid shish, PLA/CNT5/GE0.1 exhibited unexpectedly simultaneous enhancement in ductility, strength, and stiffness, outperforming common pure PLA with increase of 1952%, 40.6%, and 24.1%, respectively. Of particular interest was the conductive nanohybrid shish fabricated with industrial feasibility, displaying the competitive advantages in achieving high-conductivity and high-performance PLA, even for other semicrystalline polymers. The unprecedented combination of high electrical conductivity, ductility, strength, and stiffness established in PLA-based nanocomposites only by tailoring the crystalline microstructures is in great potential need for electromagnetic shielding, electronic devices, and antistatic packaging applications.

对于导电聚合物复合材料（CPC）的实际应用，尤其是对于固有的基于脆性聚乳酸（PLA）的CPC，平衡的电导率和机械性能始终具有重要意义。在本文中，提出了相控制方法（即碳纳米管（CNTs）和强烈的扩展流场协同诱导的PLA结晶）以实现原位导电纳米杂化光泽，其由大量被PLA结晶相覆盖的CNT组成。此外，通过将1D线状导电纳米杂化光泽和2D补片板状石墨烯（GE）结合起来，可轻松构建导电网络，从而形成高导电性PLA / CNT / GE纳米复合材料。与普通纯PLA（4.2×10 ^-12S / cm），PLA / CNT5 / GE0.1（1.32 S / cm）的电导率急剧增加了12个数量级。同时，由于纳米杂化光泽的强增强作用，PLA / CNT5 / GE0.1的延展性，强度和刚度出乎意料地同时增强，分别超过普通纯PLA分别增加1952％，40.6％和24.1％。特别令人感兴趣的是具有工业可行性的导电纳米复合材料，即使对于其他半结晶聚合物，在实现高导电性和高性能PLA方面也显示出竞争优势。仅通过调整晶体微观结构，在基于PLA的纳米复合材料中建立的高电导率，延展性，强度和刚度的空前组合非常需要电磁屏蔽，