Preparation of Graphene/PI Films and Study of Their Resistance to Atomic Oxygen Corrosion
Atomic oxygen is one of the most dangerous environmental factors in the near-earth orbit(200～1 000)km,as it can cause corrosion and degradation of spacecraft materials,thereby affecting the stability and shortening the lifespan of spacecraft.In this study,graphene was doped to enhance the atomic oxygen corrosion resistance of polyimide(PI).A novel electrode structure of limit exfoliating graphite foil was innovatively designed,and graphene(EGs)was produced by electrochemical method using alternating current.EGs/PI composite films with different proportions were prepared by in-situ polymerization.After atomic oxygen exposure experiments,all ratios of EGs/PI composite films showed improved resistance to atomic oxy-gen corrosion.Among them,the composite film with 2 wt% graphene achieved the best effect,which could reduce the mass loss of the composite material by 46% .Bonding and barrier effects of the flaked fillers are responsible for the enhanced resistance.These preliminary yet intriguing results pave a novel way for the study of atomic oxygen corrosion resistance.
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