Experimental study demonstrates durable conductive composite films with reversible dynamic bonds, suggesting potential for scalable flexible electronics and wearable devices.
The booming development of flexible electronics urgently calls for flexible conductive materials with outstanding mechanical strength, desirable elastic recovery, and reliable conductivity. Herein, a UV-curable polyacrylate conductive composite film (polyacrylate-AA-ChCl, PAAC) is rationally designed, featuring enhanced elastic recovery endowed by reversible hydrogen bonds. A polyacrylate (PA) film is first fabricated via UV-initiated polymerization using acrylate monomers and a vinyl-terminated polyurethane prepolymer as the cross-linker, exhibiting high transparency (>90%), solvent resistance (>72 h), favorable mechanical strength, and folding resistance. Subsequently, a polymerizable deep eutectic solvent (PDES)—specifically, acrylic acid/choline chloride (AA/ChCl)—was incorporated. This endows the composite with stable ionic conductivity while preserving its original mechanical properties. The resultant PAAC composite as a flexible strain sensor achieves excellent compatibility between components, outstanding mechanical durability (14.2 MPa and 735%), reliable conductivity (GF = 1.58) under deformation, and a low glass transition temperature (Tg = 4.5 °C). This work proposes a facile, scalable, and high-performance strategy for fabricating flexible conductive composites, which offers novel insights into the advancement of flexible electronics, wearable devices, and eco-friendly functional materials.
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Si et al. (2026) studied this question.
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