Abstract Hydrogenated acrylonitrile–butadiene rubber (HNBR) was mixed with carbon fiber (CF), conductive carbon black (CCB) and multi-walled carbon nanotubes (MWCNT) to prepare microwave absorbing composites, their complex permittivity was measured in microwave frequencies (2–18 GHz), and their electromagnetic characteristics and microwave absorbing performance were studied. The real part and imaginary part of permittivity of the composites increased with increasing carbon filler loading, showing dependency on filler type. The microwave reflection loss of the composites also depended on the loading and type of fillers. The matching thickness of the absorber layer decreased with increasing permittivity, while the matching frequency decreased with increasing layer thickness. The minimum reflection loss was −49.3 dB for HNBR/MWCNT (100/10) composite, while −13.1 dB for HNBR/CCB (100/15) composite and −7.1 dB for HNBR/CF (100/30) composite. The efficient microwave absorption of HNBR/MWCNT composites is accounted from high conduction loss and dielectric relaxation of MWCNT, and strong interface scattering.

中文翻译：

---

不同碳基氢化丙烯腈-丁二烯橡胶复合材料的电磁特性和吸波性能

摘要 氢化丁腈橡胶 (HNBR) 与碳纤维 (CF)、导电炭黑 (CCB) 和多壁碳纳米管 (MWCNT) 混合制备吸波复合材料，在微波频率 (2– 18 GHz)，并研究了它们的电磁特性和微波吸收性能。复合材料介电常数的实部和虚部随着碳填料填充量的增加而增加，表现出对填料类型的依赖性。复合材料的微波反射损失还取决于填料的负载和类型。吸收层的匹配厚度随着介电常数的增加而减小，而匹配频率随着层厚度的增加而减小。HNBR/MWCNT (100/10) 复合材料的最小反射损耗为 -49.3 dB，HNBR/CCB (100/15) 复合材料为 -13.1 dB，HNBR/CF (100/30) 复合材料为 -7.1 dB。HNBR/MWCNT 复合材料的高效微波吸收归因于 MWCNT 的高传导损耗和介电弛豫以及强界面散射。