STUDY ON THE DEEP DIELECTRIC CHARGING PROTECTION TECHNOLOGY OF TWO TYPICAL POLYMERS ON SPACECRAFT

The high-energy electron radiation can easily lead to the high level of deep dielectric charging in spacecraft used polymers,which is the potential threat to the operation of spacecraft.The conduction modification is an effective method to raise the charge releasing ability of the material and lower down the level of deep dielectric charging.A kind of semi-conductive inorganic filler is doped into the two typical spacecraft polymers,polytetrafluoroethylene（PTFE） and polyimide（PI）,and the processing technology and conduction properties of the composites were studied.The normal state conductivity,the temperature-dependent conduction property,the nonlinear conduction property and the thermal conductivity of the composites with different filler contents were measured.The experimental results indicate that,the electrical conduction and the thermal conduction are both influenced by the inorganic filler,especially the threshold field of the nonlinear conduction property drops obviously.The composites,possessing the high insulation and nonlinear conduction property,may solve the deep dielectric charging phenomenon of the spacecraft polymers.