Study on the deep-charging protection technology of space polymers modified by inorganic filler

The conduction modification is an effective method to raise the releasing ability of deposited charge and to weaken the level of deep charging in polymers under space environments. The inorganic semi-conductive filler was here chosen to modify the polytetrafluoroethylene(PTFE) and polyimide(PI). With this particular filler, the conduction properties of the composites varying with the temperature and electrostatic field were measured. The experimental results indicate that, the volume conduction properties are significantly affected by the content of filler. With different content of filler, the temperature-dependent conduction property shows a regular variation and the threshold field of nonlinear conduction property under different temperatures declines obviously in particular. The modified polymer, as a new type of functional composites with reasonable conduction properties, are considered to limit the level of deep charging in the space polymers to a safe degree.