均苯型聚酰亚胺薄膜在质子辐照下的力学性能退化试验研究

聚酰亚胺薄膜广泛应用于航天器热控结构和太阳帆等充气展开结构中,由于暴露在航天器表面,受到各种空间环境效应的影响,其力学性能会发生退化。文章对不同通量、注量和温度条件下质子辐照对均苯型聚酰亚胺薄膜力学性能的影响进行了模拟试验研究。研究发现,当质子通量较低时,质子通量的增加对薄膜力学性能的影响微弱;当质子通量持续增加,薄膜的抗拉强度和断裂伸长率呈近似线性下降;当质子注量增加到一定程度后,薄膜的抗拉强度和断裂伸长率下降速率变缓;薄膜在低温辐照下比在高温辐照下更容易发生脆性断裂。

The effect of space proton environment on mechanical properties of polypyromellitimide film

Polyimide films used in multilayered insulation and deployable structures in spacecraft are susceptible to space environmental effects,which would degrade their mechanical properties.The polypyromellitimide films were exposed to the space proton environment in the geo-synchronous orbit under the condition of different exposure durations,flux and temperatures.After the space exposure,the tensile tests were carried out for the samples.There is no marked degradation when the flux is smaller than 3.17×109p.cm-2.s-1.As the flux becomes much bigger,the tensile strength and the elongation at break decrease approximately linearly.With the increase of the exposure time,the tensile strength and the elongation at break decrease at a lower speed.Higher temperature causes a smaller change in the mechanical properties.