A Polymeric Damper with Double-Network-Induced Low-Frequency Loss

The durability of existing bioelectronic sensing damping materials must be improved while maintaining cost control. We present a double-network damper (DND) with low-frequency damping and high dissipation. The damper system features a double network comprising a highly entangled first network and a hydrogen-bond-enhanced second network. The hydrogen-bond-enhanced second network slows the relaxation of the polymer system, resulting in low-frequency losses with a loss factor of 1.12 at 0.1 Hz, and significantly improves dissipation, reaching 14 kJ/m 3 at 10% compression strain. This damper achieves a tear energy of approximately 44 kJ/m 2 . It can collect high-quality signals for an extended period as a damper without risking mechanical fatigue.