空间近紫外辐照聚酰亚胺薄膜力学性能演化机理  

Mechanism for Changes in Mechanical Properties of Polyimide Membrane Irradiated by Near Ultraviolet Light

作　　者：沈自才[1] 高鸿[2] 牟永强[1] 白羽[1] 丁义刚[1] 刘业楠[1] 王志浩[1] 

机构地区：[1]北京卫星环境工程研究所,北京100094 [2]中国空间技术研究院宇航物资保障事业部,北京100094

出　　处：《真空科学与技术学报》2016年第4期482-487,共6页Chinese Journal of Vacuum Science and Technology

基　　金：国家自然科学基金资助项目(41174166);十二五总装共性技术项目

摘　　要：空间近紫外辐射环境可造成航天器用聚酰亚胺(PI)薄膜力学性能将发生变化。本文利用空间综合辐照地面模拟试验装置和热重分析、X射线光电子能谱(XPS)分析等微观测试对空间近紫外辐射环境下均苯型PI薄膜力学性能演化与机理进行了研究。研究发现,均苯型PI薄膜的抗拉强度和断裂伸长率随着近紫外曝辐量的增加先降低后增加,最后趋于稳定;由热重分析可知,近紫外辐照后PI薄膜的热重损失温度出现明显下降;由XPS分析可知,分子键的断裂和交联是PI力学性能变化的主要原因,在近紫外辐照初期以断裂为主,随着近紫外曝辐量的增加,以交联为主。The influence of near ultraviolet radiation on the mechanical properties of polyimide（PI） membrane in space environment was experimentally investigated via simulated simulation with X-ray photoelectron spectroscopy,thermal gravimetric analysis and conventional mechanical probes to understand the damage mechanisms of PI material.The results show that the near ultraviolet radiation significantly affects the molecular bond and mechanical properties.To be specific,as the radiation timeincreased from OESH to lOOOESH,boththe rupture elongation and tensile strength sharply decreased at first,then exponentially increased and finally became stable.We suggest that the breakage and cross-linkage of the molecular bond observed may account for the changes in the mechanical behavior of PI membrane.In the initial irradiation stage,dominance of the bond-breakage is responsible for the deterioration of the mechanical properties;and then,dominance of the bond cross-linkage explains the improvement of the mechanical behavior.

关 键 词：聚酰亚胺 力学性能 近紫外 辐照 机理 

分 类 号：V45[一般工业技术—材料科学与工程]