Preparation of Shell/Core Atypical Spiral Conductive Microfibers and Composite Membrane with Good Conductivity and Mechanical Properties

Abstract Poly(3,4‐ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT: PSS) core–shell conductive atypical spiral microfibers are prepared based on microfluidic spinning technology (MST). The formation mechanism of the special‐shaped spiral structure is analyzed. The microfibers and polydimethylsiloxane (PDMS) are composited into membranes, and the microfibers and composite membranes are characterized. The research results show that the conductivity of shell conductive bulbine‐torta (BT) microfibers and the composite membrane are 0.125 1 and 0.880 2 s cm −1 , respectively. The maximum strain of a single PEDOT: PSS core–shell conductive BT microfibers is 36.92% under a stress of 213.10 kPa, and the maximum strain of the composite membrane is 107.46% under a stress of 470.56 kPa, indicating that the composite membrane can effectively improve the properties and practicability of the conductive fiber. The change of resistivity of the composite membrane in the stretched state is observed, and it is found that the resistivity first steadily increases and then increases exponentially, indicating that composite membrane has potential application prospects in the fields of thin membrane sensors, electronic skins, smart wearable textiles, etc.