1‐Methyl‐4‐(8‐(Nitrooxy)octyl)‐1,2,4‐triazolium Bis((trifluoromethyl)Sulfonyl)Imide as an Energetic Plasticizer for the HTPB/TDI System**

Abstract Energetic plasticizer is an important means to improve the energy performance of solid propellants, but there is no suitable energetic plasticizer for HTPB/TDI system. In this work, a nitrate‐functionalized ionic liquid plasticizer of 1‐Methyl‐4‐(8‐(Nitrooxy)octyl)‐1,2,4‐triazolium bis((trifluoromethyl)sulfonyl)imide ([NTAZ][NTf 2 ]) was synthesized, and the energy was increased by the combination of nitrate functional group and 1,2,4‐triazole cation. The hydrogen bond between the anion and the cation and HTPB achieves a good plasticizing effect. When 6% [NTAZ][NTf 2 ] was added to HTPB/TDI system, the glass transition temperature decreased from −63.41 °C to −64.84 °C, the tensile strength increased from 0.52 MPa to 0.79 MPa, and the storage modulus increased from 64.02 MPa to 110.32 MPa. When 4% DOA is replaced by the same amount of [NTAZ][NTf 2 ] in the HTPB formulation system, the specific impulse is increased from 261.0 s to 271.4 s. This study will guide the design and application of new energetic solid propellant plasticisers, both theoretically and experimentally.