采用有机无机复合的溶胶-凝胶方法,合成了用于聚合物表面保护层的前驱溶液.采用旋转涂覆方法,将前驱溶液涂覆于聚酰亚胺基片上,制成了表面涂层.将所制得的相应涂层分别进行原子氧暴露试验,其表面形貌的变化通过扫描电镜观测.结果表明,在原子氧辐照下,无保护的聚酰亚胺表面已非常粗糙,与辐照前的光滑表面形成显著的对比.而涂覆有保护层的表面,原子氧辐照前后却没有变化.这表明使用这种有机无机复合的溶液涂层具有很好的抗原子氧能力.
A coating of atomic oxygen resistant was obtained through the sol-gel method, and the precursors for
the coating were synthesized and analyzed. The precursor liquid was prepared by using methacryloxypropyltrimethoxysilane (MAPTMS) and
tetraethylorthosilicate (TEOS). IR spectra of different precursor liquids were compared, and the strength of Si-O bonds was discussed. The coatings
prepared from the precursor liquid were exposed on atomic oxygen in an amount of 5.4×1020/cm2. The results obtained demonstrate that
the amount of TEOS addition has greater effects on the strength. SEM experiment shows that they also possess the good performance on the atomic
AO exposed oxygen resistant. The SEM photos show nearly no change for the coatings prepared from the precursors with and without AO exposure,
but the substrate Kapton without protective coating eroded. The coating prepared from this kind of precursor can protect the polymer surface from atomic oxygen erosion, and can be used in the
spacecraft in LEO.
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