Kapton表面复合氧化硅涂层抗原子氧性能研究

通过溶胶-凝胶工艺以正硅酸乙酯(TEOS)和γ-(甲基丙稀酰氧)丙基三甲氧基硅烷(MEMO)为前躯体在聚酰亚胺薄膜(Kapton)基体上制备了有机/无机复合氧化硅涂层,地面模拟原子氧暴露试验表明涂层防护使基体的原子氧侵蚀速率下降了一个数量级,暴露前后基体的光学性能基本没有改变,加入MEMO相对量为0.2时涂层抗原子氧性能较好。扫描电子显微镜(SEM)、傅里叶红外衰减全反射光谱(FTIR-ATR)和X射线光电子能谱(XPS)分析表明原子氧暴露后Si-O-Si基团特征峰均向纯氧化硅的硅氧键吸收峰处偏移,而由MEMO产生的Si 2p价态峰减弱,因此涂层趋向于转化为稳定的纯氧化硅结构。

Atomic Oxygen Erosion Resistance of Hybrid Silica Coatings on Kapton

The organic/inorganic hybrid silica coatings were prepared on Kapton substrate by sol-gel process,using tetraethoxysilane(TEOS) and 3-(methacryloxypropyl)-trimethoxy silane(MEMO) as precursors.The experiment results of atomic oxygen with ground simulation device show that the erosion yield of the silica-coated Kapton is one order less than that of the pristine Kapton.Comparatively,the silica coating with 0.2 MEMO presents better AO-ersion resistance.After AO exposure,the coated Kapton can keep optically stable.The analysis results of SEM,FTIR-ATR and XPS indicate that after AO exposure,the characteristic peak of Si-O-Si bonds shifts to that of Si-O bonds of SiO2,and the intensity of Si 2p state peak from MEMO decreases.Therefore,the coating structure tends to transfer to stabile SiO2.