Research Progress in Thermal Expansion Characteristics of TATB Based Polymer Bonded Explosives

Under complex temperature variations, the irreversible thermal expansion of 1,3,5-triamino-2,4,6-trinitrobenzene (TATB) based polymer bonded explosives (PBXs) results in decreased shape stability, directly impacting mechanical properties, safety performance during storage and use. In recent years, extensive and thorough researches have seen carried out on the thermal expansion characteristics of TATB based explosives. This paper summarizes the thermal expansion characteristics of TATB based PBXs, the influencing factors, as well as their suppression methods. Starting with the distinctive crystal structure of TATB, the thermal expansion mechanism of TATB based PBXs is introduced, the microstructural evolution during the thermal expansion process is summarized, and the effects of thermal expansion on comprehensive performance are analyzed. More attention to the influencing factors of thermal expansion and control methods are paid. Existing challenges are summarized with the recommendation for further exploration into the irreversible expansion mechanism of TATB based PBXs. It point out several key directions for future development: design and control of TATB crystal structure, construction and development of novel composites with integrated structural-functional properties, as well as the application of negative thermal expansion functional materials.