针对核电工业中电阀门密封用聚酰亚胺耐辐照问题，通过对比辐照前后聚酰亚胺材料的结构特征、力学性能、热性能等的变化，分析和评价了辐照剂量对材料性能的影响。结果表明：经γ射线辐照后，聚酰亚胺的拉伸强度基本不变，断裂伸长率明显减小，压缩强度有一定变化；红外光谱峰的位置和强度无明显变化；玻璃化转变温度存在小幅度降低。

Aiming at the radiation resistance problem of polyimide used for electric valve sealing in the nuclear power industry, the effects of irradiation dose on the properties of polyimide were analyzed and evaluated by comparing the change of structure characteristics, mechanical properties and thermal properties before and after irradiation. The results show that after γ-ray irradiation, the tensile strength of the polyimide basically remained unchanged, the elongation at break significantly decreased, the compression strength changed slightly, The FTIR spectrum peak position and strength had no obvious change, and the glass transition temperature decreased a little.