Stretchable conductive fibers have attracted much attention due to their potential use in wearable electronics. However, the ultra-high strain insensitive conductivity is hindered by mechanical mismatch in Young’s modulus and failure of stretchable structures under large deformation. This challenge is addressed with a conductive and elastic multifilament made of the polyurethane monofilaments that are surface-coated with buckled polypyrrole (PPy) of which flexibility is improved by sodium sulfosalicylate. Such parallel conductive monofilaments with PPy buckling on surface reduce the influence of cracks in the conductive coating on the overall conductivity, displaying an ultra-high strain insensitive behavior (quality factor Q = 10.9). Remarkably, various complex forms of wearable electronic textiles made by this conductive multifilament maintain the strain-insensitive behavior of the original multifilament, even upon the large deformation of human joint. This multifilament with wrinkled PPy has attractive advantages in the application of super-stretched wearable electronic devices.

可拉伸导电纤维因其在可穿戴电子产品中的潜在用途而备受关注。然而，超高应变不敏感电导率受到杨氏模量的机械失配和可拉伸结构在大变形下失效的阻碍。这一挑战通过由聚氨酯单丝制成的导电弹性复丝解决，聚氨酯单丝表面涂有屈曲聚吡咯 (PPy)，磺基水杨酸钠提高了其柔韧性。这种表面具有 PPy 屈曲的平行导电单丝减少了导电涂层中裂纹对整体电导率的影响，表现出超高应变不敏感行为（品质因数Q = 10.9)。值得注意的是，由这种导电复丝制成的各种复杂形式的可穿戴电子纺织品即使在人体关节发生较大变形的情况下也能保持原始复丝的应变不敏感行为。这种带有褶皱PPy的复丝在超拉伸可穿戴电子设备的应用中具有吸引人的优势。