AC Electrical Properties of Epoxy/Silicon Carbide Whiskers Composites Coated with TiO 2 and Poly(divinylbenzene)

Abstract

This article deals with the alternating current electrical properties of epoxy/silicon carbide whiskers composites coated with titanium dioxide and poly(divinylbenzene). The alternating current conductivity and dielectric properties was studied as a function of frequency in the range from 100 kHz to 2 MHz, and temperature in the range from 30 to 120°C. It was found that alternating current conductivity increases with increasing temperature and frequency. Some alternating current conductivity and dielectric properties of epoxy/SiC whiskers composites coated with titanium dioxide and poly(divinylbenzene) as dielectric constants, activation energy, and relaxation time were determined. The observed enhancement in alternating current conductivity is attributed to increase in the number of conduction paths created by the whiskers contacts in the composite to give higher electrical conductivity. The universal power-law of alternating current conductivity is observed in silicon carbide whiskers composites. The calculated power exponent (less unity) is physically acceptable within this applied model.

Keywords

silicon carbide whiskers composites poly(divinylbenzene)conductivity titanium dioxide activation energy.

Get full access to this article

View all access options for this article.

References

Avella, M. , Martuscelli, E. , Raimo, M. , Partch, R. , Gangolli, S. and Pascucci, B. ( 1997). Polypropylene Reinforced with Silicon Carbide Whiskers , Journal of Materials Science, 32: 2411-2416.

Payyih, D. and Chung, D.L. ( 1996). Silicon Carbide Whisker Copper-Matrix Composites Fabricated by Hot Pressing Copper Coated Whiskers, Journal of Materials Science, 31: 399-406.

Lim, D.C. , Joo, B.I. , Jun, J.H. and Choi, D.J. (2005). Effect of Whisker Diameter on Field Emission Properties of Silicon Carbide Whiskers Grown by Chemical Vapor Deposition, Journal of Materials Science, 40: 3025-3026.

Yih, P. and Chung, D.D. ( 1996). Silicon Carbide Whisker Copper-Matrix Composites Fabricated by Hot Pressing Copper Coated Whiskers, Journal of Materials Science, 31: 399-406.

Chen, L.F. ( 1997). Leonelli C Alignment of silicon Carbide Whisker in Polymer Matrix, Journal of Materials Science, 32: 627-631.

Liepins, R. , Mcfarlan, J. , Benicewics, B. , Jahn, R. , Cash, D. and Milewski, J.V. ( 1988). Beta-silicon Carbide Whisker-Polymer Composites. Part 1: Electrical Conductivity, Polymer Bulletin, 19: 603-608.

Xu, Y. and Chung, D.D. ( 2001). Mroz C Thermally Conducting Aluminum Nitride Polymer Matrix Composites, Composites Part A: Applied Science and Manufacturing, 32: 1749-1757.

Frevel, L.K. , Saha, C.K. and Petersen, D.R. ( 1995). Characterization of SiC Whiskers, Journal of Materials Science, 30: 3734-3745.

Elimat, Z.M. ( 2006). AC Electrical Conductivity of Poly(methyl ethacrylate)/Carbon Black Composite, J. Phys. D. Appl. Phys., 39: 2824-2828.

10.

Dsenturia, S. and Wedlock, B.D. ( 1975). Electronics Circuit and Applications, 5th edn, John Wiley and Sons, New York.

11.

Serway, R.A. ( 1990). Physics for Science and Engineering with Moder Physics , 3rd edn, Sounders College Publishing , New York.

12.

Hummel, R.E. ( 1993). Electronic Properties of Materials, 2nd edn, Springer-Verlag, New York .

13.

Delemonte, J. ( 1981). Technologies of Carbon and Graphite Fiber Composite, Van Nostrand-Reinhold, New York.

14.

Marton, L. and Martor, C. ( 1980). An Introduction to Macromolecules, 1st edn, pp. 379-400, Academic, London.

15.

Hussien, F. and Zihlif, A. (1993). Electrical Properties of Nickel-coated Carbon-fiber/Nylon66 Composite, J. Thermoplast. Compos. Mater., 6: 120-129.

16.

Vijayalakshmi, R.R. and Shridhar, M.H. (2002). Effect of P-toluene Sulphonic Acid on the Dielectric Properties of Poly (4-vinylpyridine), Materials Science and Engineering, A325: 73-78.

17.

Berger, M.A. and McCullough, R.L. (1985). Characterization and Analysis of the Electrical Properties of a Metal-filled Polymers, Compos. Sci. Technol., 22: 81.

18.

Van Beek, L.K. (1967). Progress in Dielectrics , Vol. 7, p. 69, Heywood, London.

19.

Sagan, S. , Zihlif, A. and Ragosta, G. ( 2004). Physical Properties of PS/alum Composites, Polymer Testing, 23: 739-745.

20.

Jonscher, A.K. (1983). Dielectric Relaxation in Solids, Chelsea Dielectric Press, London, UK.

21.

Atta, A. ( 2001). Alternating Current Conductivity and Dielectric Properties of Newly Prepared Poly (bis thiourea sulphoxide), J. Polym. Mater., 52: 361-372.

22.

Papathanassiou, A.N. , Sakellis, I. and Grammatikakis , J. (2007). Universal Frequency-dependent AC Conductivity of Conducting Polymer Networks , Applied Physics Letters, 91: 122911.