Resumo

GARZON POSADA, Andrés Orlando; LANDINEZ TELLEZ, David Arsenio; ROA ROJAS, Jairo  e  RAMOS BARRADO, José. POLYMER BASED COMPOSITES FOR SHIELDING ELECTROMAGNETIC INTERFERENCE. Cienc. Ing. Neogranad. [online]. 2017, vol.27, n.1, pp.5-26. ISSN 0124-8170.  https://doi.org/10.18359/rcin.1917.

This work aims at revising the state of the art in the synthesis and characterization of polymer/ ferrites or polymer/carbon based composites used as EMI shielding materials. In recent years, such composites have been subject of research not only due to their potential technological applications and economy advantages, but also because they are environmentally friendly since some recycled materials such as some plastics and rubbers may be used for their production. Composites of this kind are used in different applications such as magnetic and microwave absorption, transducers manufacturing and biomedical applications like targeted drug delivery, labeling organs, magnetic hyperthermia, among many other things. Fillers of different shapes are used to produce these kinds of composites. Particles, fibers or sheets from several materials can be employed as matrices; for example, thermoplastic or thermoset polymers, synthetic or natural rubbers. It was found that the production method (melt-blending, solution processing, etc.) influenced the electric, magnetic and electromagnetic properties of the composite material due to the aspect ratio of the fillers: fillers with high aspect ratios result in composites with improved electrical, magnetic and better EMI shielding performance. The electromagnetic shielding for these materials is quantified through the shielding effectiveness (SE) or by the reflective loss (RL). A shielding effectiveness of 30 dB corresponds to a 99.9% of electromagnetic attenuation. It was proved that the composite properties depend on the filler content within the matrix.

Palavras-chave : composite material; ferrites, carbon; electromagnetic attenuation; electromagnetic shielding; resistivity; conductivity; magnetization.

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