摘要: The preparation of lightweight materials with electromagnetic interference-shielding effect- iveness higher than 30dB is critical for most industrial and consumer applications. Compounding polymer resin with conductive filler can generate excellent electromagnetic interference-shielding effectiveness but usually leads to a high-sample density, while the foaming of polymer composite suffers from the significant-reduced electromagnetic inter- ference-shielding effectiveness. In this study, polyetherimide composite foams with loading of 10–80 phr (parts per hundred of resins) nickel particles were fabricated to meet the gap. The polyetherimide/nickel composite foams possessed uniform cell structure and low- sample density such as 0.86 g/cm3 at 70 phr nickel. The coupling effects of gravity settle- ment and cell-structure solidification led to the formation of gradient distribution of nickel particles across the foams. The formed novel structure facilitated the enhancement of multi-reflection and multi-scattering among nickel particles and cells. As a consequence, polyetherimide/nickel foam with 70 phr nickel (PEIN70) possessed a high-electromagnetic interference shielding effectiveness of 86.7–106.5 dB over a frequency range of 50–3000MHz. When the sample density was considered, the specific electromagnetic interference shielding effectiveness of PEIN70 foam was as high as 121.3 dB/(g/cm3) at 1 GHz, which was higher than the reported electromagnetic interference-shielding materials. The excellent electromagnetic interference-shielding properties, lightweight, well-defined resin proper- ties ensure polyetherimide/nickel composite foams useful in many advanced applications.
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期刊:
ELECTROCHIMICA ACTA
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分类:
物理学
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普通物理:统计和量子力学,量子信息等
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引用:
ChinaXiv:201705.00401
(或此版本
ChinaXiv:201705.00401V1)
DOI:10.12074/201705.00401V1
CSTR:32003.36.ChinaXiv.201705.00401.V1
- 推荐引用方式:
Qin, LF [Qin, Laifen][ 1,2 ],Xia, YG [Xia, Yonggao][ 1 ],Cao, HL [Cao, Hailiang][ 1 ],Luo, LJ [Luo, Linjun][ 1 ],Zhang, Q [Zhang, Qian][ 1 ],Chen, LP [Chen, Lipeng][ 1 ],Liu, ZP [Liu, Zhaoping][ 1 ].(2017).Effects of Ti additive on the structure and electrochemical performance of LiMnPO4 cathode material.ELECTROCHIMICA ACTA.[ChinaXiv:201705.00401]
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