聚酰亚胺气凝胶材料的电子/紫外辐照效应及机理分析  

Electron/Vacuum Ultraviolet Irradiation Effect and Mechanism Analysis of Polyimide Aerogel Materials

作　　者：孙承月[1] 郭鑫鑫 吴忧 曹争利 王豪[1] 琚丹丹 王岩[5] 吴宜勇[1] SUN Chengyue;GUO Xinxin;WU You;CAO Zhengli;WANG Hao;JU Dandan;WANG Yan;WU Yiyong(Laboratory for Space Environment and Physical Sciences,Harbin Institute of Technology,Harbin 150001,China;Guangzhou GRG Metrology&Test Co.,Ltd.,Guangzhou 510627,China;Xi’an Aerospace Chemical Propulsion Co.,Ltd.,Xi’an 710511,China;Shanghai Institute of Aerospace System Engineering,Shanghai 201109,China;Beijing Institute of Spacecraft System Engineering,Beijing 100094,China)

机构地区：[1]哈尔滨工业大学空间环境与物质科学研究院,哈尔滨150001 [2]广州广电计量检测股份有限公司,广州510627 [3]西安航天化学动力有限公司,西安710511 [4]上海宇航系统工程研究所,上海201109 [5]北京空间飞行器总体设计部,北京100094

出　　处：《材料导报》2022年第22期157-164,共8页Materials Reports

基　　金：国家自然科学基金(21975248)。

摘　　要：开展气凝胶多孔材料在空间辐照环境下的损伤行为及性能退化规律的研究是拓展其空间应用的重要基础,可为其在轨性能的预测提供合理的理论依据。本工作通过对比聚酰亚胺(PI)气凝胶辐照前后的热稳定性及导热能力,结合现代材料分析技术,对材料的电子和真空紫外(VUV)辐射效应及损伤机理进行了研究。结果表明,170 keV和1 MeV的电子辐射均会对PI气凝胶造成电离损伤,导致C-O含量降低,材料发生降解。此外,170 keV的电子辐射还会使材料产生充放电效应,破坏材料的微观结构,使其比表面积降低16.6%。真空紫外辐照会活化PI气凝胶表面,O含量增加到61.45%,与原始样品相比,C=O和C-O含量均有所增加。电子辐照和VUV辐照对PI气凝胶的热稳定性、导热能力未造成明显影响。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.

关 键 词：聚酰亚胺 气凝胶 空间环境 电子 紫外 

分 类 号：V416.5[航空宇航科学与技术—航空宇航推进理论与工程]