Fuente: Journal of applied polymer Lugar: RESEARCH ARTICLE A flexible, eco-friendly PPGC conductive composite membrane was fabricated via electrospinning of PVA/CMC/Gly followed by in situ modification. Exhibiting high sensitivity (GF ≈ 9.70) and good conductivity, it accurately detects human motions, showing great promise for wearable strain sensing applications.

ABSTRACT
With the burgeoning rise of the intelligent era, the flexible wearable strain sensors capable of being affixed to human skin for real-time monitoring of motion and physiological signals have garnered significant attention. In this study, polyvinyl alcohol (PVA) was selected as the substrate, polyaniline as the conductive filler, and the bio-based raw materials such as glycerol (Gly) and sodium carboxymethyl cellulose (CMC) were introduced. An environmentally friendly conductive composite fiber membrane (PPGC) flexible sensing material with good toughness and high sensitivity was fabricated by PVA/Gly/CMC electrospun nanofiber membrane in situ coated with polyaniline. The strain sensitivity (gauge factor, GF) of PPGC conductive composite fiber membrane can reach 9.7 within the strain range of 0%–40%. Its electrical conductivity is 2.37 mS/m, and its tensile strength and elongation at break are 6.0 MPa and 48%, respectively. PPGC can accurately detect the movements of different parts of the human body, demonstrating a promising application prospect in wearable monitoring systems.