| AEROSPACE MATERIALS |
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| Electron/Vacuum Ultraviolet Irradiation Effect and Mechanism Analysis of Polyimide Aerogel Materials |
| SUN Chengyue1, GUO Xinxin2, WU You3, CAO Zhengli4, WANG Hao1, JU Dandan1, WANG Yan5, WU Yiyong1,*
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1 Laboratory for Space Environment and Physical Sciences, Harbin Institute of Technology, Harbin 150001, China
2 Guangzhou GRG Metrology & Test Co.,Ltd., Guangzhou 510627, China
3 Xi'an Aerospace Chemical Propulsion Co.,Ltd., Xi'an 710511, China
4 Shanghai Institute of Aerospace System Engineering, Shanghai 201109, China
5 Beijing Institute of Spacecraft System Engineering, Beijing 100094, China |
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Abstract The discussion about the scathing behavior and performance degradation law of aerogel porous materials in multifactorial space irradiation environment is integral to tap its potentials in space application, thereupon then to provide a trustworthy theoretical rationale for prediction on orbit application. Herein, the research of electronic and vacuum ultraviolet (VUV) radiation effects and damage mechanism of the material was conducted by comparing the thermal stability and thermal conductivity of as-grown and irradiated polyimide (PI) aerogels, combining with modern material analysis technology. The results showed that ionization damage and degradation of PI aerogel occurred under both 170 keV and 1 MeV electron radiation, along with the reduction content of C-O. Further, 170 keV electron radiation triggered charging-discharging effect, resulting in the damage of the microstructure and reducing its specific surface area by 16.6%. VUV could activate the surface of PI aerogel, and oxygen content increased up to 61.45%, while the content of C=O and C-O increased simultaneously compared with original sample. No significantly change in thermal stability and thermal conductivity of PI aerogel was observed under electron irradiation and VUV irradiation.
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Published: 25 November 2022
Online: 2022-11-25
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| Fund:National Natural Science Foundation of China (21975248). |
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