Double-network ion gel of polyurethane/1-methyl-3-allyl imidazole metal salt, and preparation method and use thereof

A method for preparing a double-network (DN) ion gel of a polyurethane (PU)/1-methyl-3-allyl imidazole metal salt, comprising the following steps:

• providing a PU solution;
• subjecting a 1-methyl-3-allyl imidazole ionic liquid and an inorganic metal salt to first mixing to obtain a modified ionic liquid, wherein the inorganic metal salt is one or more selected from the group consisting of a zinc salt, a terbium salt, and an europium salt;
• subjecting the modified ionic liquid, a monomer, a cross-linking agent, a photoinitiator, an organic solvent, and the PU solution to second mixing to obtain a photocurable polyionic liquid solution, wherein the monomer comprises one or more selected from the group consisting of acrylic acid and acrylamide;
• and
• subjecting the photocurable polyionic liquid solution to photocuring and drying to obtain the DN ion gel of the PU/1-methyl-3-allyl imidazole metal salt.