Green Mechanochemical Strategy for the Construction of a New Bio-based Nylon 5₂4T Ternary Salt

Green chemistry calls for reducing the use of environmentally harmful materials and petroleum resources. Bio-based nylon materials can help address this problem. In this study, a new bio-based nylon 5₂4T ternary salt was discovered and constructed by a green mechanochemical method based on the pharmaceutical cocrystal screening and synthesis strategy. The effects of adding solvents and grinding times on the formation of a ternary salt were systematically studied, and the formation of a nylon 5₂4T ternary salt under solvent-assisted grinding was found to follow a mechanically driven dissolution–recrystallization mechanism. Furthermore, the chemical and physical properties of nylon 5₂4T ternary salt were determined and compared with corresponding nylon 54 binary and 5T binary salts. The results demonstrated that the constructed ternary salt has better thermodynamic property and humidity stability. This contribution offers a new well-performed ternary salt monomer for a potential copolymer PA54/5T with high-temperature resistance, but also a new potential perspective for the molecular segment regulation of the copolymer by direct solid-state polymerization and a green and efficient strategy to construct a copolymer ternary salt monomer.