原子氧对聚酰亚胺表面侵蚀及有机硅涂层保护

ATOMIC OXYGEN IRRADIATION INDUCED DEGRADATION OF POLYIMIDE WITHOUT AND WITH SILOXANE COATING

用光电子能谱 (XPS)、红外光谱 (FTIR)和扫描电镜 (SEM)研究有和无有机硅涂层的聚酰亚胺 (Kapton)在模拟原子氧 (AO)环境中表面所发生的侵蚀作用 .结果表明 ,AO对Kapton有较严重的侵蚀 ,原来平整的表面形貌变为毛毯状 ;而所施用的有机硅涂层的表面形貌则变化甚少 ,表明该涂层具有较明显的防护效果 .这种防护作用在于 ,有机硅涂层表面经AO辐照后生成了致密的氧化硅膜层 。

Surface properties of Kapton without and with ogranosiloxane coating were analyzed after exposure to ground state fast atomic oxygen (AO) radiation in a ground simulated atomic oxygen beam facility.X-ray photoelectron spectroscopy,I.R.spectroscopy and scanning electron microscopy were used to characterize the chemical and physical changes of the surface of materials tested.The test results indicated that the change in the surface chemistry of Kapton induced by AO were oxidation degradation of polymer and substantial change in structure of supermoleculars and morphology of the surface layer.It is further found in the experiment that siloxane film provides excellent protection from AO irradiation.The irradiation results in formation of SiO 2 left on the surface of the coating,thus,providing protection from further attack by the energetic oxygen atoms.