Synergistic enhancement of the mechanical properties of polyurethane ionogel by halometallate ionic liquid-induced phase separation and hydrogen bond cross-linking

C-H⋯Br and N-H⋯Br interactions, optimizing the distribution of hard domains in the polymer-rich phase and forming a more densely packed physical cross-linked network, thereby enhancing the overall structural stability. Furthermore, the PU ionogel sensors demonstrated a wide response range (maximum strain: 780%; maximum pressure: 1500 kPa) and rapid response/recovery time (177/236 ms), enabling real-time monitoring of human movement. This study provides a strategy for resolving the contradiction between stress and strain in PU ionogels.