Polydopamine-coated iron-nickel alloy and epoxy composites for electromagnetic interference shielding

IF 2.7 3区 化学 Q2 POLYMER SCIENCE Journal of Applied Polymer Science Pub Date : 2024-09-07 DOI:10.1002/app.56187
Hakjeong Kim, Sera Jeon, Yun Seong Cho, Chenyao Huang, Seongmin Na, Jihun Lee, Youngwook Chung, Joohoon Kang, Sang-Woo Kim, Dukhyun Choi
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Abstract

With the development of electronic devices and wireless communication technology, the quality of human life has improved. However, shielding from electromagnetic interference (EMI) is required due to device malfunctions and harmful effects on human health. Polymer-based shielding materials getting much attention due to their light weight, flexibility, good processability, and other desirable traits. However, achieving consistent dispersion of conductive fillers and optimizing the balance between electrical, mechanical, and thermal properties remain challenges despite the advantages of polymer-based materials. Especially, epoxy resins are promising polymer materials for EMI shielding applications due to their excellent mechanical strength, chemical resistance, and excellent adhesive properties. Additionally, epoxy resin exhibits remarkable processability allowing for various fabrication techniques such as casting, molding, and three-dimensional printing. However, one of the significant drawbacks of epoxy resin is the difficulty in achieving uniform dispersion of conductive fillers within the epoxy matrix. In this study, we propose an iron-nickel alloy (FeNi) embedded in an epoxy matrix (FeNi/Epoxy) for EMI shielding material. It is manufactured by facile fabrication process due to the advantages of epoxy, which has excellent processability. EMI shielding effectiveness at 12 GHz is enhanced from 9.12 to 17.86 dB by the increase of FeNi concentrations. Furthermore, thermal and mechanical properties were improved by the increase of FeNi concentration. Thermal conductivity for efficient heat dissipation is increased from 0.63 to 1.49 Wm−1 K−1. Moreover, polydopamine (PDA) was employed as a surface coating material for FeNi to overcome the non-uniform dispersion of FeNi particles in the epoxy matrix. Surface coating by PDA significantly enhanced the dispersion uniformity and strengthened the adhesion between the filler and matrix. Elastic modulus is greatly increased from 83.03 MPa to 1.29 GPa by the surface coating. The enhancement of mechanical properties is derived from the chemical bonds between the filler and matrix.

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用于电磁干扰屏蔽的聚多巴胺涂层铁镍合金和环氧树脂复合材料
随着电子设备和无线通信技术的发展,人类的生活质量得到了提高。然而,由于设备故障和对人体健康的有害影响,需要屏蔽电磁干扰(EMI)。聚合物屏蔽材料因其重量轻、柔韧性好、可加工性强等优点而备受关注。然而,尽管聚合物基材料具有诸多优势,但要实现导电填料的稳定分散以及优化电气、机械和热性能之间的平衡仍是一项挑战。特别是环氧树脂,由于其优异的机械强度、耐化学性和出色的粘合性,是 EMI 屏蔽应用中很有前途的聚合物材料。此外,环氧树脂还具有出色的可加工性,可用于各种制造技术,如铸造、模塑和三维打印。然而,环氧树脂的一个显著缺点是难以在环氧基质中实现导电填料的均匀分散。在本研究中,我们提出了一种嵌入环氧树脂基体(FeNi/Epoxy)的铁镍合金(FeNi)作为 EMI 屏蔽材料。由于环氧树脂具有良好的可加工性,因此可以通过简便的制造工艺进行生产。随着铁镍浓度的增加,12 GHz 的 EMI 屏蔽效果从 9.12 dB 提高到 17.86 dB。此外,随着镍铁浓度的增加,热性能和机械性能也得到了改善。有效散热的热导率从 0.63 Wm-1 K-1 提高到 1.49 Wm-1 K-1。此外,还采用了聚多巴胺(PDA)作为镍铁的表面涂层材料,以克服镍铁颗粒在环氧基体中分散不均匀的问题。PDA 表面涂层大大提高了分散均匀性,并增强了填料与基体之间的粘附力。通过表面涂层,弹性模量从 83.03 MPa 大幅提高到 1.29 GPa。机械性能的提高源于填料与基体之间的化学键。
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来源期刊
Journal of Applied Polymer Science
Journal of Applied Polymer Science 化学-高分子科学
CiteScore
5.70
自引率
10.00%
发文量
1280
审稿时长
2.7 months
期刊介绍: The Journal of Applied Polymer Science is the largest peer-reviewed publication in polymers, #3 by total citations, and features results with real-world impact on membranes, polysaccharides, and much more.
期刊最新文献
Editorial Board, Aims & Scope, Table of Contents Editorial Board, Aims & Scope, Table of Contents Editorial Board, Aims & Scope, Table of Contents Synthesis of reaction promoters for epoxy polymerization: Enhancing storage stability and mechanical properties of one-pot epoxy systems Editorial Board, Aims & Scope, Table of Contents
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