兼具导电及抗原子氧性能的复合薄膜制备及性能

The Preparation and Performance of Composite Films with both Conductivity and Anti-atomic Oxygen Properties

聚酰亚胺薄膜因其良好的耐热性和绝缘性在航空航天应用广泛,但其容易在低地球轨道受到原子氧的侵蚀,使其各项优异性能退化至丧失。首先采用原位自金属化法对聚酰亚胺薄膜进行开环刻蚀、离子交换和热还原后,制备出PI/Ag的复合薄膜,基于PI/Ag的复合薄膜结合刮涂的方式在表面引入抵抗原子氧侵蚀的含硅聚酰亚胺,从而制备出两种浓度的PI/Ag/Si-PI复合薄膜。并对其进行XPS,SEM和抗原子氧辐照测试等表征,结果发现PI/Ag/Si-PI复合薄膜具有优良的抗原子氧性能,且较高浓度的效果更佳。表层Si-PI在原子氧辐照过程中形成致密的SiO_2来进一步抵抗原子氧的侵蚀,从而保护与其紧挨着的下层及导电银层,从而保证了兼具导电及抗原子氧性能的复合薄膜。

The polyimide film is widely used in the aerospace because of its good heat resistance and insulation. But it is vulnerable to the atom-ic oxygen erosion in low earth orbit and it will make its various outstanding performances degrade to lose finally. At first, the method of in situ selfmetallization is adopted for the process of ring opening etching, ion exchanging and thermal reduction of polyimide to prepare PI/Ag composite film.Then based on the PI/Ag composite film combined with blade coating, the polyimides containing silicon which possesses the atomic oxygen erosion re-sistance is introduced on the surface, thus the PI/Ag/Si-PI composite films with two kinds of concentrations are prepared. The products are character-ized by XPS, SEM and anti-atomic oxygen radiation test and the results show that the PI/Ag/Si-PI composite films have better anti-atomic oxygen performance and the higher concentration, the better effect they have. The Si-PI on the surface layer will form the compact SiO2 in the process of atomic oxygen irradiation to further resist the atomic oxygen erosion, thus to protect the lower layer next to it and the conductive silver layer, so as to ensure both the conductivity and atomic oxygen resistance of the composite films.