Preparation and Electromagnetic Properties of Carbon Nanofiber/Epoxy Composites

被引:25
|
作者
Lv, Xiao [1 ]
Yang, Shenglin [1 ]
Jin, Junhong [1 ]
Zhang, Liang [1 ]
Li, Guang [1 ]
Jiang, Jianming [1 ]
机构
[1] Donghua Univ, State Key Lab Modificat Chem Fibres & Polymer Mat, Shanghai 200051, Peoples R China
来源
关键词
blend; carbon nanofiber; polyacrylonitrile; polymethyl methacrylate; thermal treatment; wet-spinning; NANOTUBES; FIBERS;
D O I
10.1080/00222340903355750
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Carbon nanofibers (CNFs) with diameters ranging from 50 nm to 150 nm were prepared from polymer blends of polyacrylonitrile (PAN)/polymethyl methacrylate (PMMA) via a wet-spinning method and subsequent thermal treatment. The main factors that influence the diameter of the CNFs, including molecularweight of PAN, mass ratio of PAN/PMMA, and spinning draw ratio, are discussed. The formation of graphitization structures of the blend fibers during the carbonization process was investigated by Fourier transform infrared spectroscopy, Raman spectroscopy, and X-ray diffraction spectroscopy. The complex permittivity epsilon (epsilon' - j epsilon ''), complex permeability mu (mu' - j mu ''), and microwave absorption properties of CNF/epoxy composites were studied in the X-band frequency range (8.2-12.4 GHz). e', e '', mu', and mu ''' were found to increase with increased CNF content. Measured values of these parameters were used to determine the reflection loss at various sample thicknesses, based on amodel of a single-layered plane wave absorber backed by a perfect conductor. The calculated results showed that the composite with a CNF content of 8 wt% and a thickness of 2.1 mm would give a maximum reflection loss of -34 dB at 10.5 GHz with the -10 dB bandwidth over the extended frequency range of 8.8-12.4 GHz.
引用
收藏
页码:355 / 365
页数:11
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