Abstract: In order to study the charge degree of polyimide with different thickness under the circumstance of temperature change， the surface charge synthetic experimental system developed for the dielectric material of spacecraft， and temperature controllable， was used to experiment the surface charge of different thickness of polyimide material at different temperature. The electron energy was set to 25keV， and the electron beam density was set to 0.5， 1， 2nA/cm2， respectively. Experimental results show that， when the temperature is constant， with the increase of thickness of polyimide， the balance potential of surface charge of the sample would increase gradually. When the thickness of polyimide is constant， with the increase of temperature， the balance potential of surface charge of the sample would decrease gradually. When the temperature is in the range of 273～363K， the greater the thickness of the polyimide sample is， the greater the effect of the temperature change on the surface charge balance potential of the polyimide. When the temperature is in the range of 243～273K， the greater the thickness of the polyimide sample is， the smaller the effect of the temperature change on the surface charge balance potential of the polyimide.

Key words: Temperature；Thickness；Polyimide；Surface charge；Balance potential

摘要： 为了研究不同厚度聚酰亚胺在温度变化情况下的带电程度，利用自行研发的温度可控的航天器介质材料表面带电综合实验系统，对不同厚度的聚酰亚胺在不同温度情况下进行表面充电实验，设置电子能量为25keV，电子束流密度分别为0.5，1，2nA/cm2。实验结果表明:温度不变的情况下，随着厚度的增大，试样表面充电平衡电位逐渐增大；厚度不变的情况下，随着温度的升高，试样表面充电平衡电位逐渐减小。当温度在273～363K时，聚酰亚胺试样厚度越大，温度变化对其表面充电平衡电位的变化影响越大。当温度在243～273K时，聚酰亚胺试样厚度越大，温度变化对其表面充电平衡电位的变化影响越小。

关键词: 温度；厚度；聚酰亚胺；表面充电；平衡电位