Study on the measurement method of polyimide electrical properties for flexible solar wing

IF 3.8 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC IET Nanodielectrics Pub Date : 2023-03-13 DOI:10.1049/nde2.12047
Qian Wang, Shuyue Ma, Sichen Qin, Jiawei Zhang, Rui Liu
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Abstract

Flexible solar wings with high energy density, lightweight, small size and large deployment area are one of the first choices for next-generation spacecraft. However, the flexible solar wings are subjected to irradiation in space and tensile mechanical stress, which produce the charge accumulation effect and result in electrostatic discharge. It is necessary to establish a test method for the conductivity and space charge behaviour of polyimide under tensile stress. The stress–strain characteristics of polyimide under different tensile stresses are studied by the authors. The longitudinal length-strain characteristics and transverse thickness evolution characteristics under different stresses are also obtained. The results show that the variation of film thickness with tensile force is only about 1% before the yield point. The polyimide films from 50 to 200 μm thick have similar yield and tensile strengths. The ultimate stress of the specimen decreases from approximately 126 to 103 MPa with increasing thickness. The thickness model of polyimide under tensile stress were obtained, which could accurately calculate the voltage amplitude applied on the specimens for measuring the conductivity under different tensile stresses. A basis for investigating the stress–strain characteristics of polyimide films under different tensile stresses are provided, which will facilitate the formulation selection and performance improvement of polyimide for flexible solar wings of spacecraft.

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柔性太阳能翼聚酰亚胺电性能测试方法的研究
具有高能量密度、重量轻、体积小、展开面积大等特点的柔性太阳能翼是下一代航天器的首选之一。然而,柔性太阳能翼受到空间辐照和拉伸机械应力的作用,产生电荷积累效应,产生静电放电。有必要建立一种测试聚酰亚胺在拉伸应力下的电导率和空间电荷行为的方法。研究了聚酰亚胺在不同拉伸应力下的应力-应变特性。得到了不同应力下的纵向长度-应变特征和横向厚度演化特征。结果表明,在屈服点之前,薄膜厚度随拉伸力的变化仅为1%左右。50 ~ 200 μm厚度的聚酰亚胺薄膜具有相似的屈服强度和抗拉强度。随着厚度的增加,试样的极限应力从126 MPa减小到103 MPa。建立了聚酰亚胺在拉应力作用下的厚度模型,该模型可以准确地计算出施加在试样上的电压幅值,用于测量不同拉应力下的电导率。为研究不同拉伸应力下聚酰亚胺薄膜的应力-应变特性提供了依据,为航天器柔性太阳翼用聚酰亚胺的配方选择和性能改进提供了依据。
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来源期刊
IET Nanodielectrics
IET Nanodielectrics Materials Science-Materials Chemistry
CiteScore
5.60
自引率
3.70%
发文量
7
审稿时长
21 weeks
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