Microwave absorbers designed from PVDF/SAN blends containing multiwall carbon nanotubes anchored cobalt ferrite via a pyrene derivative

被引:76
作者
Biswas, Sourav [1 ]
Kar, Goutam Prasanna [1 ]
Bose, Suryasarathi [1 ]
机构
[1] Indian Inst Sci, Dept Mat Engn, Bangalore 560012, Karnataka, India
关键词
IMMISCIBLE POLYMER BLENDS; ELECTRICAL-CONDUCTIVITY; MECHANICAL-PROPERTIES; NONCOVALENT FUNCTIONALIZATION; INDUCED DISPERSION; COMPOSITES; MORPHOLOGY; NANOCOMPOSITES; LIGHTWEIGHT; NANOPARTICLES;
D O I
10.1039/c5ta02177d
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Lightweight and flexible electromagnetic shielding materials were designed by selectively localizing multiwall carbon nanotubes (MWNTs) anchored magnetic nanoparticles in melt mixed co-continuous blends of polyvinylidene fluoride (PVDF) and poly(styrene-co-acrylonitrile) (SAN). In order to facilitate better dispersion, the MWNTs were modified using pyrenebutyric acid (PBA) via pi-pi stacking. While one of the two-targeted properties, i.e., high electrical conductivity, was achieved by PBA modified MWNTs, high magnetic loss was accomplished by introducing nickel (NF) or cobalt ferrites (CF). Moreover, the attenuation by absorption can be tuned either by using NF (58% absorption) or CF (64% absorption) in combination with PBA-MWNTs. More interestingly, when CF was anchored on to MWNTs via the pyrene derivative, the minimum reflection loss attained was -55 dB in the Ku band (12-18 GHz) frequency and with a large bandwidth. In addition, the EM waves were blocked mostly by absorption (70%). This study opens new avenues in designing flexible and lightweight microwave absorbers.
引用
收藏
页码:12413 / 12426
页数:14
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