Continuous Surface Metallization of Polyimide Fibers for Textile‑Substrate Electromagnetic Shielding Applications  

作　　者：Shixu Zhou Jie Dong Xiuting Li Xin Zhao Qinghua Zhang 

机构地区：[1]State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,College of Materials Science and Engineering,Donghua University,201620 Shanghai,People’s Republic of China

出　　处：《Advanced Fiber Materials》2023年第6期1892-1904,共13页先进纤维材料（英文）

基　　金：the Scientific Research Innovation Plan of Shanghai Education Commission(2019-01-07-00-03-E00001);National Natural Science Foundation of China(No.U21A2087,21975040);the Natural Science Foundation of Shanghai(21ZR1400200).

摘　　要：Despite tremendous effort,continuous fabrication of high-performance conductive polymer fibers for electromagnetic interference(EMI)shielding applications remains a daunting technical challenge.In the current study,we report an efficient strategy for continuous surface metallization of polyimide fibers used in textile-substrate electromagnetic shielding applications.Polyimide fibers with pendent carboxyl groups(PIC)were first fabricated,and a conductive nickel layer was continuously coated on the PIC surface by electroless metal deposition(ELD).The carboxyl groups introduced onto the fiber surface acted as binding sites for the Ni^(2+)ions,and the complexation reactions greatly increased the Ni^(2+)adsorption capacity and efficiency of the PIC fibers during the ELD process and ensured continuous fabrication.Through judicious control of the plating time,a series of nickel-layer-coated PIC fibers(Ni-PIC)were constructed with Ni loadings ranging from 20 to 230 wt%.The resultant Ni-PIC fiber containing 65 wt%Ni exhibited conductivity of 223 S cm^(−1),and the corresponding fabric exhibited an EMI shielding effectiveness(EMI SE)of 44 dB in the X-band.The corresponding EMI SE was further improved to 83 dB after the fiber was treated at 300℃ for 1 h because of the crystallization of the Ni layer.The prepared Ni-PIC fibers and fabrics were also used in pressure sensors and electrothermal conversion,which demonstrated outstanding adaptabilities to various temperatures and mechanical properties.Overall,this work provides an efficient route for developing high-performance conductive polyimide fibers for EMI shielding applications,especially for use in military and aerospace equipment and in other harsh environments.

关 键 词：POLYIMIDE Carboxyl group Nickel layer Electroless metal deposition EMI shielding 

分 类 号：O63[理学—高分子化学]