Dielectric Properties of Commercial non-Polar Polymers

Hameed M. Ahmed, & Shuja-Aldeen B. Aziz

College of Science, University of Sulaimani

Frequency and temperature dependence of dielectric constant (3') and dielectric loss (3''), in
commercial non-polar polymers which were high density polyethylene (HDPE) and polystyrene (PS), of
thicknesses 2.8 and 2.7mm respectively with diameter 5.6 cm, are studied in the temperature range (20-
110°С) and in the frequency range (1KHz-1MHz).It was observed that the dielectric constant of non-polar
polymers decrease with increasing temperature as well as with frequency. The dielectric constant of PS
increases with temperatures above 70°С, which is due to the glass transition temperature. It has been found
that the dielectric loss of HDPE and PS decrease with increasing frequency and some loss peaks are
observed. The dielectric loss of HDPE was found to be slightly temperature dependent, while the dielectric
loss of PS, were found to increase slightly with increasing temperature.

Keywords: commercial non-polar polymers, dielectric constant, dielectric loss, dielectric relaxation

1. Stuerga D.”Microwaves in Organic Synthesis” Wiley, second edition 2006
2. Khare P. K. “Dielectric properties of solution-grown-undoped and acrylic-acid-doped ethyl cellulose” Bull. Mater. Sci., , 2000, . 23, No. 1
3. Dilip K. D. “Polyethylene: Structure, Morphology, Molecular Motion and Dielectric Behavior” IEEE Electrical Insulation Magazine , 2000. 10, No.3, pp: 5-15 1994
4. Butkewitsch S. and Scheinbein J. “Dielectric properties of a hydrated sulfonated poly (styrene-ethylene/butylenes-styrene) triblock copolymer” Applied Surface Science, 2006 252, 8277-8286
5. Tony B. and David B. “Electrical Properties of Polymers” Cambridge University Press, Second Edition2005.
6. Raja V., Sharma A. K. and Narasimha Rao V. V. R. “Impedance spectroscopic and dielectric analysis of PMMA-CO-P4VPNO polymer films” Materials Letters 2004 58, 3242-3247
7. Bhatnagar M.S. “A Textbook of Polymers” S. Chand & Company LTD, 2004, II, 
8. Stephen H. F. “Electrical Properties of Composites in the Vicinity of the Percolation Threshold” Journal of Applied Polymer Science, 1999, 72, 1573-1582
9. Raju G. G. “Dielectrics in Electric Fields” New York . Basel, 2003. 10. Vijayalakshmi R., Ashokan P. V. and Shridhar M. H. “Studies of dielectric relaxation and a.c. conductivity in cellulose acetate hydrogen phthalate-poly(methyl methacrylate) blends” Mat. Sc. And Eng. 2000, A281, 213-220
11. Tripathi A., Tripathi A. K. and Pillai P. K. C. “Effect of mica on the dielectric relaxation of polyvinyl chloride (PVC) films” Journal of Material Science 1990, 25, 1947-1951
12. Kao K. C. “Dielectric Phenomena in Solids” Elsevier, Academic Press, 2004