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| Performance of Silicon Rubber at Low Temperature |
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| DOI：10.7643/issn.1672-9242.2023.04.005 |
| KeyWord:silicone rubber low temperature compression set tensile property crystallization thermal analysis |
| Author | Institution |
| HU Tao |
Southwest Institute of Technology and Engineering, Chongqing , China;CSGC Key Laboratory of Ammunition Storage Environmental Effects |
| WU Yang |
Southwest Institute of Technology and Engineering, Chongqing , China;National Field Scientific Observation and Research Station for Atmospheric Material Corrosion in Mohe, Heilongjiang Mohe , China |
| SUN Mao-jun |
Southwest Institute of Technology and Engineering, Chongqing , China;CSGC Key Laboratory of Ammunition Storage Environmental Effects |
| LI Qian |
Southwest Institute of Technology and Engineering, Chongqing , China;CSGC Key Laboratory of Ammunition Storage Environmental Effects |
| ZHAO Fang-chao |
Southwest Institute of Technology and Engineering, Chongqing , China;CSGC Key Laboratory of Ammunition Storage Environmental Effects |
| WANG Ling |
Southwest Institute of Technology and Engineering, Chongqing , China;CSGC Key Laboratory of Ammunition Storage Environmental Effects |
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| Abstract: |
| The work aims to explore the effects of low temperature environment on properties of silicone rubber. The change rules for compression set properties of 6 141 and 6 144 silicone rubber were studied, the effects of different low temperature environments on the Shore hardness and tensile properties of two types of silicone rubber were explored, and the thermal effects and elastic recovery behaviors of the materials were analyzed by DSC and TMA. The study suggested that at–55 ℃, with the extension of the freezing time, the low temperature compression set of silicone rubber would change abruptly. When frozen for 27 days, the low temperature compression set of 6141 and 6 144 reached 81% and 92% respectively. Comparing the hardness and tensile properties at –25 ℃ with that at –55 ℃, it was found that with the decrease of temperature, the elongation at break of the material first increased and then decreased, and the tensile strength and hardness gradually increased. When the temperature decreased to –55 ℃, due to crystallization of the material, the tensile strength of silicone rubber 6141 and 6144 increased by 58% and 72%, respectively, and the hardness after stabilization increased by 25 and 36, respectively. Moreover, through DSC and TMA studies, it was found that silicone rubber would crystallize at low temperature, and the resilience would be reduced. And the compression set of 6141 and 6144 obtained by TMA test at –55 ℃ was 60% and 62%, respectively. The results show that, silicone rubber material has a sudden property change and failure at temperature higher than the glass transition temperature and crystallization temperature because the silicone rubber slowly crystallizes in a very low temperature environment for a long time. |
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