Abstract
Conducting polymer composites should have a high dielectric constant and a high dissipation factor in the low and high frequency regions if they are to be used in charge storing devices, decoupling capacitors and electromagnetic interference shielding applications. Currently, extensive research is being carried out to enhance the dielectric constants of graphite-polymer, ceramic powder-polymer, metal powder-polymer and nanotube-polymer composites in the low frequency region. In this paper, we present the dielectric properties of styrene-acrylonitrile (SAN)-graphite sheets (GS) composites in the low and high frequency ranges. SAN-GS composites were prepared by the mixing process and by the hot compression mold technique. The composites showed a high dielectric constant and a high dissipation factor in the low and radio frequency region. Furthermore, the EMI shielding properties of these composites are evaluated in the radio frequency range. The conductivity and the dielectric constant of the SAN/GS composites increased with the addition of GS composites, and followed the power law model of percolation theory. The dielectric constant and the dissipation factor of the composites were analyzed according to the low and high frequency region. Crown
| Original language | English |
|---|---|
| Pages (from-to) | 1777-1784 |
| Number of pages | 8 |
| Journal | European Polymer Journal |
| Volume | 45 |
| Issue number | 6 |
| DOIs | |
| State | Published - Jun 2009 |
Bibliographical note
Funding Information:This research has been supported by the Strategy Technology Development Programs (No. 10030039) from the Korea Ministry of Knowledge Economy. This work also supported by DRDO, Govt. of India under the project (ERIP/ER/0503529/M/01/850).
Keywords
- Conducting polymer
- Dielectric property
- EMI shielding
- Graphite-sheet
- Styrene-acrylonitrile