石墨烯/PI薄膜制备及耐原子氧腐蚀性能研究

Preparation of Graphene/PI Films and Study of Their Resistance to Atomic Oxygen Corrosion

原子氧是近地轨道环境(200~1000)km中最危险的环境因子之一,它会引起航天器材料的腐蚀和降解,进而影响航天器的稳定性、缩短使用寿命。本文中,研究了石墨烯填料用于提升聚酰亚胺材料(PI)的耐原子氧腐蚀性能。创新性的设计了一种新型的限位剥离石墨箔的电极结构,通过使用交流电的电化学方法制备出了石墨烯(EGs)。通过原位聚合制备了不同比例的EGs/PI复合膜。原子氧暴露实验后,所有比例的EGs/PI复合膜的耐氧原子腐蚀性能都有所提升。其中添加2wt%的EGs/PI复合膜耐氧原子腐蚀性能最佳,可使复合材料的质量损失下降46%。石墨烯的成键效应和壁垒效应对复合材料防护性能的提升起主要作用。这些初步但有趣的结果为耐原子氧腐蚀研究开辟了新道路。

Atomic oxygen is one of the most dangerous environmental factors in the near-earth orbit(200~1000)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 corrosionAmong 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.