Superior stretchable, strongly adhesive, and environmentally stable multifunctional eutectogel enabled by dual-network and metal-ion coordination strategy

• A high-performance multifunctional eutectogel was fabricated. • The mechanical property was increased by metal coordination and double network. • Eutectogel featured excellent adhesion, self-healing and environmental stability. Athletes may experience several muscle and joint injuries due to improper exercise load management in high-intensity training. Exercise monitoring and drug treatment are commonly used separately during traditional rehabilitation programs, making it difficult to apply anti-inflammatory therapy simultaneously when abnormal biomechanical loads are identified. Therefore, this study developed a multifunctional dual-network eutectogel material combining motion monitoring and transdermal drug delivery, with eutectogel using deep eutectic solvent (DES) as the solution, poly (4-hydroxyphenyl methacrylate- co -acrylic acid) and carboxylated cellulose nanofibers as the primary and secondary networks, as well as zirconium ions (Zr 4+ ) as the physical crosslinking agent. The dual-network structure design and Zr 4+ coordination cross-linking resulted in excellent mechanical properties, attaining tensile ratios exceeding 1500% and a maximum tensile strength over 0.75 MPa. Meanwhile, eutectogel provided excellent skin adhesion, environmental temperature resistance (−20 to 60 °C), self-healing performance, and electrical conductivity (GF = 2.106), allowing reliable, continuous, and high-fidelity human motion monitoring in harsh environments. The eutectogel had a high drug loading capacity, supporting targeted and controlled transdermal drug delivery without exerting cytotoxicity or skin irritation. This multifunctional dual-network structure provides a promising strategy for targeted drug delivery and exercise monitoring, facilitating chronic pain management for better health recovery.