Fuente: Journal of applied polymer Lugar: RESEARCH ARTICLE Polyurethane conductive ion gels have shown good research potential in the field of ion skin due to their good ionic conductivity and self-healing ability, but balancing mechanical stretchability, dynamic self-healing, and ion conductivity is still challenging. Here, we report a polyurethane-based ionogel (PU@IL1) cross-linked by 2-methylpiperazine-derived hindered urea bonds (HUBs) and polyetheramine T403, and plasticized with [EMIM][TFSI]. The gel has an ionic conductivity of 406.92 μS/cm, an elongation of 1830.7%, and self-healing at room temperature (24 h strength recovery of 74%, elongation recovery of 85%). As a strain sensor, it exhibits GF = 8.66 (0.1%–0.5%) and a response time that is always less than 100 ms, enabling real-time human motion monitoring. The addition of [EMIM][TFSI] and with the aid of ethyl acetate can significantly improve the long-term storage stability of polyurethane ionogels, which lays a foundation for its practical application in wearable devices with long service life.

ABSTRACT
Polyurethane conductive ion gels have shown good research potential in the field of ion skin due to their good ionic conductivity and self-healing ability, but balancing mechanical stretchability, dynamic self-healing, and ion conductivity is still challenging. Here, we report a polyurethane-based ionogels (PU@IL1) cross-linked by 2-methylpiperazine-derived hindered urea bonds (HUBs) and polyetheramine T403, and plasticized with [EMIM][TFSI]. The gel has an ionic conductivity of 406.92 μS/cm, an elongation of 1830.7%, and self-healing at room temperature (24 h strength recovery of 74%, elongation recovery of 85%). As a strain sensor, it exhibits GF = 8.66 (0.1%–0.5%) and a response time that is always less than 100 ms, enabling real-time human motion monitoring. The addition of [EMIM][TFSI] and with the aid of ethyl acetate can significantly improve the long-term storage stability of polyurethane ionogels, which lays a foundation for its practical application in wearable devices with long service life.