Effect of Atomic Oxygen Irradiation on Tribological Performance of a Polyimide Containing Benzimidazole Groups
WANG Yanming1,2,*, GAO Xiaohong1,3, LI Ping1, WANG Tingmei2, WANG Qihua2
1 College of Materials Science and Engineering, Technology Innovation Center of Modified Plastics of Hebei Province, Hebei University of Engineering, Handan 056038, Hebei, China 2 Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China 3 School of Chemical Engineering, Lanzhou University of Technology, Lanzhou 730050, China
Abstract: Anti-radiation property of atomic oxygen(AO) plays an important role in polymers and their complexes' reliability and safety in the application of space equipment. The studies show that polymers with aromatic heterocyclic group or structure such as sulfur and nitrogen can present anti-irradiation property to some extent. Therefore, the molecular structure can be designed in order to enhance the polymer's anti-irradiation in essence. Now, the research on the radiation resistance of polymers such as polyethersulfone, polysulfone and polyimide shows that introducing chemical groups with excellent heat-resistance can effectively improve the anti-irradiation property. The benzimidazole structure endows polybenzimi-dazole the good potential to anti atomic oxygen irradiation, due to the superior heat-resistance. However, subject to the complex synthesis conditions of polybenzimidazole, synthesis of polyimide with benzimidazole structure in the backbone becomes the better choice. A polyimide containing benzimidazole groups (PMI) was synthesized with a traditional two-step method. The mechanical and tribological properties of the PMI film were investigated before and after atomic oxygen (AO) irradiation, and were subsequently compared with those of the polyimide without the ben-zimidazole group. The results showed that PMI presented superior anti-oxidation and mechanical properties to those of the polyimide without the benzimidazole group. Furthermore, a smoother surface was verified using the scanning electron microscopy (SEM) scans and 3D profile images, which indicated the better anti-AO irradiation properties of the PMI film. From analyzing the valence and composition of C and O elements on the irradiated surface, the results show that PMI shows a lower degree of carbonization than YS-20. At the same time, the aromatic heterocyclic structure in the main chain also improves the temperature resistance and mechanical strength of the polymer. The glass transition temperature of PMI is as high as 365 ℃. The evolution of friction properties before and after irradiation was investigated by ball disk friction experiment. Owing to different anti-AO irradiation properties, the micro-hardness and modulus of the polymer presented different variation trends, which resulted in different tribological performances after AO irradiation.
王彦明, 高晓红, 李萍, 王廷梅, 王齐华. 原子氧辐照对含苯并咪唑结构聚酰亚胺摩擦学性能影响研究[J]. 材料导报, 2023, 37(4): 21040187-7.
WANG Yanming, GAO Xiaohong, LI Ping, WANG Tingmei, WANG Qihua. Effect of Atomic Oxygen Irradiation on Tribological Performance of a Polyimide Containing Benzimidazole Groups. Materials Reports, 2023, 37(4): 21040187-7.
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2023, Vol. 37 
