Preparation and Evaluation of a Polyimide-Coated Ultrafine Gilt Molybdenum Wire and Its Knitted Mesh Used for Electromagnetic Reflectors

Huiqi Shao; Nanliang Chen; Shuang Li; Fangbing Lin; Jinhua Jiang; Xiaofei Ma

doi:10.3390/polym9120734

Preparation and Evaluation of a Polyimide-Coated Ultrafine Gilt Molybdenum Wire and Its Knitted Mesh Used for Electromagnetic Reflectors

Polymers (Basel). 2017 Dec 20;9(12):734. doi: 10.3390/polym9120734.

Authors

Huiqi Shao^{1

2}, Nanliang Chen^{3

4}, Shuang Li^{5

6}, Fangbing Lin^{7

8}, Jinhua Jiang^{9

10}, Xiaofei Ma¹¹

Affiliations

¹ State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, China. 1142002@mail.dhu.edu.cn.
² College of Textiles, Donghua University, Shanghai 201620, China. 1142002@mail.dhu.edu.cn.
³ State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, China. nlch@dhu.edu.cn.
⁴ College of Textiles, Donghua University, Shanghai 201620, China. nlch@dhu.edu.cn.
⁵ State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, China. ls@dhu.edu.cn.
⁶ Key Laboratory of High Performance fibers & products, Ministry of Education, Donghua University, Shanghai 201620, China. ls@dhu.edu.cn.
⁷ State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, China. 2140024@mail.edu.cn.
⁸ College of Textiles, Donghua University, Shanghai 201620, China. 2140024@mail.edu.cn.
⁹ State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, China. jiangjinhua@dhu.edu.cn.
¹⁰ College of Textiles, Donghua University, Shanghai 201620, China. jiangjinhua@dhu.edu.cn.
¹¹ Xi'an Institute of Space Radio Technology; Xi'an 710100, China. maxf@cast504.com.

Abstract

In this work, polyimide (PI) was coated onto an ultrafine gilt molybdenum wire in order to protect the gilt surface and prepare an electrically stable wire mesh material which can be widely used in space. The surface of the PI-coated gilt molybdenum wires was characterized using FTIR, SEM, and EDS. Factors such as temperature stability of the PI coating, mechanical properties of the PI-coated gilt molybdenum wires, contact resistance stability, and electromagnetic microwave reflectivity of the their knitted meshes were also investigated. The results indicate that the PI coating conformed uniformly to the surface of the gilt molybdenum wires. The prepared PI coating exhibited excellent temperature stability in the -196 to 300 °C range and could efficiently protect the gilt surface and improve the stability of contact resistance, while the reflection of its wire meshes showed only a slight decrease of 1.4% with the PI coating thickness of 3 μm for electromagnetic microwaves in the S band.

Keywords: contact resistance stability; gilt molybdenum; polyimide coating; reflection performance; temperature stability; wire mesh.