Mechanically Reprogrammed Coaxial Fibers for Multiphysics Transduction and Human‐Machine Interfaces

Abstract

ABSTRACT Fiber‐shaped electronic systems provide a promising platform for wearable sensing and intelligent textiles, yet the continuous processing of uncured silicone‐based conductive materials remains challenging because of their low structural stability during fiber formation. Here, we develop a coaxial wet‐spinning strategy that enables the continuous aqueous‐bath confinement of an uncured PDMS/CNT conductive core. During spinning, a rapidly phase‐separating PVDF‐HFP sheath provides immediate radial confinement, preventing leakage and structural collapse of the hydrophobic liquid core, while a UV‐crosslinked PEGDA secondary network reinforces the sheath after fiber formation. Unlike removable templates or sacrificial supporting layers, the PVDF‐HFP/PEGDA sheath is permanently retained as the dielectric and load‐bearing component, thereby directly forming an integrated dielectric–electrode coaxial fiber. The resulting PVDF‐HFP/PEGDA@PDMS/CNT fibers can be continuously fabricated at the meter scale and exhibit reversible sheath microstructural evolution, stable strain‐dependent resistance, and reliable performance under repeated deformation. The integrated dielectric–electrode architecture also allows an individual fiber to generate triboelectric signals without additional device assembly. This work demonstrates a practical route for continuously processing uncured PDMS‐based conductive materials in an aqueous coagulation bath and integrating mechanical, resistive, and triboelectric functions within a permanently retained coaxial fiber architecture.