中文摘要：

本文研究了压敏无机添加剂改性聚酰亚胺试样在-150℃至180℃范围的阻温特性。发现微米级压敏添加剂的含量对复合材料阻温特性影响显著：改性材料在低温下具有显著的负温度效应；当添加剂含量小于5％时，在0℃以上的温度范围，复合材料的电阻率有所提高

英文摘要：

The space temperature environment for spacecraft operation is very complicated. The rapid transfering between high and low temperature may eventually lead to the charge in the depth and surface of dielectric materials releasing muhi-speetral impulsive discharge. And the high energy discharge pialse may result in abnormal work of sensitive electronic systems in spacecraft. The charge gathering degree in dielectric materials is closely related to its resistivity characteristic, so it is significant to research the resistivity-temperature characteristic of polyimide. In this paper, the resistivity-temperature characteristic of the polyimide composite modified by two kinds of μm grade voltage-sensitive inorganic additive in the temperature range - 150℃ to 180℃ was studied. The research shows that the influence of the μm grade voltage-sensitive additive content for composite resistivity-temperature characteristic is significant： the modified materials presented negative temperature effect in low temperature. When the voltage-sensitive additive content was less than 5% , the resistivity of composite materials above 0℃ is increased.