Polystyrene/Carbon Black Nano Conducting Composites for PTCR Thermistors and Electromagnetic Wave Shielding Applications

Nadia Abdel Aal

Department of Chemistry, Faculty of Science, Suez Canal University, Ismailia (Egypt).

DOI : http://dx.doi.org/10.13005/msri/060101

ABSTRACT:

The network structure of the polystyrene resin/carbon black (PS/CB) nanocomposites were studied by means of scanning electron microscopy (SEM), X-ray diffraction (XRD), crosslinking density , interparticle distance among conducting sites . Mechanical properties of PS composite filled with different content of CB were investigated and the composite always exhibited higher hardness and elastic modulus than green PS. The thermal stability of nanocomposites was examined by thermal gravimetric analysis. The influences of CB content on the static conductivity, mobility carriers and concentration of charge carriers of the PS/CB nanocomposites were examined. Conductivity – temperature curves shows a positive temperature coefficient of resistance (PTCR) effect. It has been proved that the inclusion of CB into the PS/CB nanocomposites significantly enhanced the PTCR intensity and thermal stability of the nanocomposites. The electromagnetic interference shielding effectiveness (EMI), the dielectric constant, the skin depth, the reflection coefficient and the absorbance coefficient as functions of CB content of composites are investigated. In addition, the EMI, of the nanocomposites were measured and calculated in a frequency range of 1-12 GHz. The results show that PS/CB composites exhibit high EMI in the microwave band at high CB content. The composites studied are found to have a wide range of potential applications for PTCR thermistors and microwave absorber at 12 GHz.

KEYWORDS: Nanocomposites; microstructure; electrical properties; microwave properties

Copy the following to cite this article: Aal N. A. Polystyrene/Carbon Black Nano Conducting Composites for PTCR Thermistors and Electromagnetic Wave Shielding Applications. Mat.Sci.Res.India;6(1)

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