质子辐照聚酰亚胺薄膜的力学性能退化机理

Mechanical Property Degradation Mechanism of Polyimide Film by Proton Radiation

利用自制的Φ800 mm空间综合辐照试验设备和X射线光电子能谱等分析手段对质子辐照聚酰亚胺薄膜的力学性能退化及机理进行了研究。研究发现:薄膜的断裂伸长率和拉伸强度随质子辐照注量的增加而呈指数减小,弹性模量基本不变;质子辐照后聚酰亚胺薄膜仍具有较好的热稳定性,但其在紫外可见光波段透射率降低,透射光谱发生红移;分子键的断裂和交联是质子辐照聚酰亚胺薄膜力学性能降低的主要原因。

The mechanical property and mechanism of polyimide film in proton radiation was studied by φ800 combined space radiation test facility of Beijing Institute of Space Environment Engineering （BISSE） and X-ray Pho- toelectron Spectroscopy（XPS）. The following results can be obtained： the rupture elongation and tensile strength of polyimide exponential decreases with the increase of proton radiation fluenee, and its elastic modular keep steady. The polyimide film has good thermal stability in proton radiation environment, but its transmittance in ultraviolet and visible range decrease and has red shift effect. The breakage and cross linkage of molecular bond is the major cause of decrease of polyimide＇ s mechanical property in proton radiation environment.