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| Accelerated Aging Mechanism and Correlation of Hydroxyl-terminated Polybutadiene (HTPB) |
| Received:March 25, 2024 Revised:September 24, 2024 |
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| DOI：10.7643/issn.1672-9242.2024.12.007 |
| KeyWord:propellant materials aging mechanisms macroscopic property microstructure structure-function relationship accelerated aging evaluation method |
| Author | Institution |
| ZHAOZhixing |
Military Representative Bureau of Naval Equipment Department in Xi'an, Xi'an , China |
| HUOLiang |
Inner Mongolia Power Machinery Research Institute, Hohhot , China |
| CHEN Jiaxing |
Inner Mongolia Power Machinery Research Institute, Hohhot , China |
| WU Rui |
Inner Mongolia Power Machinery Research Institute, Hohhot , China |
| WANG Qi |
Inner Mongolia Power Machinery Research Institute, Hohhot , China |
| SHI Sen |
Inner Mongolia Power Machinery Research Institute, Hohhot , China |
| LI Yajun |
Inner Mongolia Power Machinery Research Institute, Hohhot , China |
| ZENG Fanqi |
College of Polymer Science and Engineering, Sichuan University, Chengdu , China |
| LYUYadong |
College of Polymer Science and Engineering, Sichuan University, Chengdu , China |
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| Abstract: |
| The work aims to elucidate the high-temperature accelerated aging research and mechanistic analysis of Hydroxyl-Terminated Polybutadiene (HTPB) propellant materials, and establish a linkage between microstructural alterations and macroscopic property variations. It systematically examined the microstructural transformations and macroscopic property variations in typical HTPB propellant materials subject to high-temperature aging. The emphasis was placed on investigating the molecular mechanisms and failure modes during accelerated aging, and deducing performance variations through the establishment of a correlation between microstructure and macroscopic properties. The findings suggested that the primary cause of macroscopic property variation over time was mainly attributed to microstructural damages, such as oxidation and cross-linking of the matrix as well as the interface damage, with oxidation cross-linking reactions observed not merely on the specimen's surface but also internally. Further investigation revealed a significant correlation between mechanical properties—tensile strength, elongation at break—and glass transition temperature (tg), the α-relaxation peak, and gel content. Oxidative damage in both the internal and surface regions of HTPB propellant materials, accompanied by filler-matrix interface damage during the high-temperature accelerated aging process, fundamentally results in the decline of mechanical properties. |
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