Abstract: Eutectogels as a novel material that can replace traditional temperature-sensitive hydrogels and expensive ionic liquid gels, have attracted significant attention in the construction of flexible electronic devices. Currently, eutectogels prepared by polymer crosslinking or low-molecular-weight gelators suffer from the limited stretchability and low conductivity. Herein, we successfully constructed a supramolecular-polymer double-network(SP-DN)eutectogel by introducing a low-molecular-weight supramolecular network(sodium taurodeoxycholate, NaTDC)into the covalent polymer network(2-hydroxyethyl acrylate, HEA). Due to the unique energy dissipation mechanism of the supramolecular-polymer double network, the tensile performance of the eutectogel was significantly enhanced. Under the optimal preparation conditions, the double-network eutectogel exhibited a fracture elongation of up to 650% and a fracture tensile strength of 0.37 MPa. Benefiting from the advantages of the supramolecular gelator and DES(deep eutectic solvent), the eutectogel exhibited excellent conductivity over a wide temperature range(60-100 ℃), and showed high sensing sensitivity(gauge factor, GF=0.01)and stability within different strain ranges. They are expected to be further applied in wearable strain sensors. This design strategy provides a reference for the development of other novel flexible conductive materials.

Key words: supramolecular, double network, eutectogel, strain sensing