389310 Multifunctional Polymer Nanocomposites Toward Electromagnetic Interference Shielding

Monday, November 17, 2014: 2:20 PM
International 9 (Marriott Marquis Atlanta)
Zhanhu Guo, Integrated Composites Laboratory (ICL), Department of Chemical & Biomolecular Engineering, University of Tennessee Knoxville, Knoxville, TN, Qingliang He, Integrated Composites Laboratory (ICL), Dan F Smith Department of Chemical Engineering, Lamar University, Beaumont, TX and Suying Wei, Department of Chemistry and Biochemistry, Lamar University, Beaumont, TX

Multifunctional polymer nanocomposites including polyurethane nanocomposites reinforced with iron-silica core-shell nanoparticles, polypropylene nanocomposites reinforced with magnetic (magnetite, iron) nanoparticles and carbon nanotubes are fabricated  for electromagnetic interference shielding applications.  Parameters including filler surface treatment (controlled shell coating thickness), filler composition, and the effect of surfactant were systematically studied. Filler dispersion quality, morphology and the magnetic properties (coercivity, saturation magnetization) were studied. In addition, relative complex permittivity and relative complex permeability are investigated and the corresponding microwave absorption performances were calculated within the tested frequency ranging from 2 - 18 GHz. Results indicate that the polypropylene nanocomposites reinforced with the combination of iron nanoparticles and carbon nanotubes exhibited a reflection loss in a wider frequency ranges with the maximum reflection loss ranged from -22 to around -44 dB under different thickness. The results indicated that the relatively match permeability and permittivity was responsible for the high efficiency in the microwave absorptions. Also, the eddy current loss for the as-prepared nanocomposites was also studied and its influence on the microwave absorption performance was discussed in detail.


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See more of this Session: Multifunctional Composites
See more of this Group/Topical: Materials Engineering and Sciences Division