HNBR / SWCNT Composites Based Flexible Conductive Film With an Excellent Electromechanical Synergy for Sensors and Wearable Electronics

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ABSTRACT The growing demand for reliable and durable flexible conductive materials in wearable electronics has intensified the need to develop novel high‐performance composites. In this study, hydrogenated nitrile butadiene rubber (HNBR)/single‐walled carbon nanotube (SWCNT) composites were fabricated via physical mixing. Their mechanical properties including tensile strength, tear strength, modulus, and electrical performance specifically resistivity were systematically evaluated under accelerated aging conditions: exposure to hot air and artificial sweat at 90°C for up to 168 and 336 h, respectively. An optimal balance between mechanical integrity and electrical conductivity was achieved at a SWCNT loading of 2 phr, yielding a tensile strength of 11 MPa, tear strength of 65 N/mm, and resistivity below 1.03 × 10 6 Ω cm. Furthermore, the composites exhibited a broad strain‐sensing range (1%–100%), high gauge factor (a GF range of 133.33–1079.03), exceptional fatigue resistance with resistance change remaining below 5% after 10,000 bending cycles, and stable electromechanical performance. These results demonstrate the promise of HNBR/SWCNT composites as a viable platform for next‐generation wearable electronics and offer a strategic pathway toward resolving the longstanding trade‐off between mechanical robustness and electrical conductivity in flexible conductive materials.

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