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| Study on the Aging Mechanism of Polyether Propellant under Temperature Cycle and Strain |
| Received:December 03, 2020 Revised:January 14, 2021 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2021.08.001 |
| KeyWord:polyether propellant temperature cycle pre-strain aging mechanism |
| Author | Institution |
| ZHAO Fang-chao |
Southwest Institute of Technology and Engineering, Chongqing , China;CSGC Key Laboratory of Ammunition Storage Environmental Effects, Chongqing , China |
| WEI Xiao-qin |
Southwest Institute of Technology and Engineering, Chongqing , China;CSGC Key Laboratory of Ammunition Storage Environmental Effects, Chongqing , China |
| LI Han |
Southwest Institute of Technology and Engineering, Chongqing , China;CSGC Key Laboratory of Ammunition Storage Environmental Effects, Chongqing , China |
| YIN Sheng-jie |
Shanghai Space Propulsion Technology Research Institute, Shanghai , China |
| LI Ze-hua |
Southwest Institute of Technology and Engineering, Chongqing , China;CSGC Key Laboratory of Ammunition Storage Environmental Effects, Chongqing , China |
| HUANG Wen-ming |
Southwest Institute of Technology and Engineering, Chongqing , China;CSGC Key Laboratory of Ammunition Storage Environmental Effects, Chongqing , China |
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| Abstract: |
| In order to master the aging mechanism of polyether propellant under the coupling effect of temperature cycle and strain, the author of this paper carried out aging test of polyether propellant under 65 ℃~75 ℃ temperature cycle and 3% pre-strain. For polyether propellants with different aging times, this paper analyzes the variation rule of mechanical properties, such as tensile strength, elongation, and the microscopic damage evolution, such as surface microscopic damage, molecular functional groups and heat of reaction. At last, the macro - micro correlation aging mechanism was comprehensively inferred by the above data. With aging time prolonged, the maximum tensile strength showed declined fluctuation. The maximum elongation first increased and then decreased. Both the peak of decomposition temperature of ammonium perchlorate and polyether binder moved toward low temperature. The absorption peak of ammonium perchlorate at 1410 cm‒1 was enhanced, while the absorption peak of carbamate at 1565 cm‒1 and amide groups at 1725 cm‒1 were decreased. The ammonium perchlorate embedded in the polyether binder was gradually exposed, and the separation between part of ammonium perchlorate particles and the surrounding was obvious. Meanwhile, there were small pores. Under the influence of long-term temperature cycle and pre-strain, the C—N bond of amide groups in the polyether propellant broke due to weak intermolecular binding force, and the reticular cross-linking structure of the chain was damaged, which made the dispersed AP particles gradually expose out of the surface and showed the characteristics of partial fracture damages, resulting in the decrease of tensile strength. |
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