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<p>High-performance electromagnetic shielding materials play an important role in the fields of electronic packaging technology and high-frequency printed circuit boards. In the past few decades, the vast majority of electromagnetic shielding materials have excellent electromagnetic properties accompanied by high conductivity. However, high conductivity greatly increases the potential risk of short circuits or leakage currents in electronic systems, posing great risks to machine equipment and personal safety. Here, we prepared a sandwich-structured composite paper with a conductive core and insulation surface by a wet papermaking process, high-temperature heat treatment, and a sandwich structure design using aramid short-cut fibers (ACFs), short-cut carbon fibers (CFs), and PPS pulp as raw materials. The 3D CFs network serves as the conductive core of the composite paper, while ACFs serve as the skeleton to provide toughness and strength basis for the composite paper, achieving excellent electromagnetic shielding performance (40.48 dB) and mechanical properties (50.46&#xa0;N/cm). The dense PPS film, as the outer layer of the sandwich-structured composite paper, further endows the material with excellent insulation properties (surface resistance &gt; 20 MΩ), acid and alkali resistance (mechanical property retention rate 75 &gt;%), and oil repellency (oil adsorption reduced by 98.77%). The sandwich-structured ACFs/CFs/PPS composite paper designed in this article not only breaks through the technical bottleneck of traditional shielding materials that cannot balance conductivity and insulation, but also combines many of the above properties, greatly improving the service life of electromagnetic shielding materials under harsh conditions.</p>

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Insulation-conduction synergistic aramid/carbon fiber/PPS sandwich composite paper: tailored electromagnetic shielding and multi-environmental adaptability

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • Wenqi Zheng,
  • Songjun Yao,
  • Liangbo Zhu,
  • Qianshun Zhang,
  • Wenzhuo Wu,
  • Junpeng Wang,
  • Xuerui Xiao,
  • Hua Wang,
  • Siwei Xiong,
  • Shiwen Yang,
  • Luoxin Wang

摘要

High-performance electromagnetic shielding materials play an important role in the fields of electronic packaging technology and high-frequency printed circuit boards. In the past few decades, the vast majority of electromagnetic shielding materials have excellent electromagnetic properties accompanied by high conductivity. However, high conductivity greatly increases the potential risk of short circuits or leakage currents in electronic systems, posing great risks to machine equipment and personal safety. Here, we prepared a sandwich-structured composite paper with a conductive core and insulation surface by a wet papermaking process, high-temperature heat treatment, and a sandwich structure design using aramid short-cut fibers (ACFs), short-cut carbon fibers (CFs), and PPS pulp as raw materials. The 3D CFs network serves as the conductive core of the composite paper, while ACFs serve as the skeleton to provide toughness and strength basis for the composite paper, achieving excellent electromagnetic shielding performance (40.48 dB) and mechanical properties (50.46 N/cm). The dense PPS film, as the outer layer of the sandwich-structured composite paper, further endows the material with excellent insulation properties (surface resistance > 20 MΩ), acid and alkali resistance (mechanical property retention rate 75 >%), and oil repellency (oil adsorption reduced by 98.77%). The sandwich-structured ACFs/CFs/PPS composite paper designed in this article not only breaks through the technical bottleneck of traditional shielding materials that cannot balance conductivity and insulation, but also combines many of the above properties, greatly improving the service life of electromagnetic shielding materials under harsh conditions.