摘要
探索具有优异性能的电磁波吸收材料是解决电磁污染的主要手段。然而,如何同时满足材料的高性能和实际应用要求仍然是一个挑战。本文采用溶胶凝胶法、塑炼、混炼及硫化等工艺制备了具有优异力学性能和吸波性能的导电炭黑(CCB)@纳米Fe_(3)O_(4)/天然橡胶(NR)吸波胶片,并通过调节CCB@Fe_(3)O_(4)的添加量来调控胶片的力学和吸波性能。CCB@Fe_(3)O_(4)复合材料的引入极大地改善了胶片的界面损耗和极化损耗,其中CCB可以在提高材料的介电常数和电导率的同时增强力学性能。当CCB@Fe_(3)O_(4)添加量为29wt%时,胶片达到−40.5 dB的最小反射损耗(RL),有效吸收带宽(EAB)为2.4 GHz,厚度为5.0 mm,并展现出最佳的抗拉强度、硬度和磨耗性能。材料优异的吸波性能来源于电-磁损耗协同效应引起的阻抗匹配、强电磁波衰减和高传导损耗。本工作为天然橡胶基吸波胶片的结构设计和实际应用提供了新的思路。
Exploring electromagnetic wave(EMW)absorbing materials with excellent performance is the main method to solve electromagnetic pollution.However,it remains a challenge to meet the high performance and practical application requirements of materials simultaneously.Conductive carbon black(CCB)@nano Fe_(3)O_(4)/natural rubber(NR)absorbing films with excellent mechanical and EMW absorption properties were prepared by sol-gel method,plasticizing,blending and vulcanization,and the mechanical and EMW absorbing properties of the films were controlled by adjusting the addition amount of CCB@Fe_(3)O_(4).The introduction of the CCB@Fe_(3)O_(4)composites greatly ameliorates the interfacial loss and polarization loss of the films,in which the CCB can enhance the mechanical properties while improving the dielectric constant and conductivity of the materials.The film achieves the minimum reflection loss(RL)of-40.5 dB and maximum effective absorption bandwidth(EAB)of 2.4 GHz with the thickness of 5.0 mm when the CCB@Fe_(3)O_(4)was added at 29wt%,and exhibited the optimal tensile strength,hardness and wear properties.The remarkable EMW absorbing properties of the material originate from impedance matching,strong EMW attenuation and high conduction loss caused by the synergistic effect of dielectric-magnetic loss.This work provides a new mentality for the structure design and practical application of natural rubber-based absorbing films.
作者
申永前
张帆
朱健
龙建
高峰
杜雪岩
SHEN Yongqian;ZHANG Fan;ZHU Jian;LONG Jian;GAO Feng;DU Xueyan(College of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Shouhang Hi-Tech Energy Technology CO.,LTD.,Jiuquan 735000,China)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2023年第9期5145-5157,共13页
Acta Materiae Compositae Sinica
基金
中国博士后科学基金(2022 MD713777)
甘肃省自然科学基金(21 JR7 RA223)
国家自然科学基金-联合基金项目(U22 A20175)。
关键词
吸波材料
天然橡胶
纳米四氧化三铁
导电炭黑
电-磁协同效应
electromagnetic wave absorption material
natural rubber
nano ferroferric oxide
conductive carbon black
dielectric-magnetic synergistic effect
