Research progress in thermal expansion characteristics of TATB based polymer bonded explosives

• Published in: Energetic materials frontiers 2023-09, Vol.4 (3), p.178-193
• Main Authors: Lin, Cong-mei, Bai, Liang-fei, Yang, Zhi-jian, Gong, Fei-yan, Wen, Yu-shi
• Format: Article
• Language: English
• Subjects: Irreversible thermal expansion; Shape stability; Structural evolution; Suppression methods; TATB
• ISSN: 2666-6472; 2666-6472
• DOI: 10.1016/j.enmf.2023.09.003

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. This study delves deeply into the critical issue of irreversible thermal expansion in TATB-based Polymer Bonded Explosives (PBXs), a problem significantly impacting their environmental adaptability and safety. The researchers underscore the urgent necessity to understand the fundamental mechanisms more profoundly and outline possible pathways for future studies — including innovative approaches in crystal design and the utilization of negative thermal expansion materials. This research sketches a roadmap that serves as a guide for future explorations aimed at enhancing the safety and applicability of TATB-based PBXs. [Display omitted] •Delineates the ITE (irreversible thermal expansion), analyzing the underlying mechanisms and microstructural evolutions.•Scrutinizes approaches to control ITE, spotlighting the role of NTE materials in enhancing stability.•Identifying current gaps, underscores the need for deeper insight into the ITE mechanism.