L. KREIT, Z. SAMIR, M.E. ACHOUR, A. OUERIAGLI, A. OUTZOURHIT, L.C. COSTA, M. MABROUKI
Abstract. In this work, the polyester polymer matrix filled with olive-pomace grains was investigated by means of dielectric spectroscopy in the frequency range 10 KHz –1MHz and temperature from 300 K to 400 K. A numerical Kramers-Kronig transformation allowed the calculation of dielectric losses from the measured dielectric constant. The obtained relaxation processes were attributed to the orientation polarization imputed to the presence of polar water molecules in the pomace grains and to the accumulation of charges at the pomace grains/polyester interfaces. The analysis of the temperature dependence of the relaxation time using the Arrhenius equation shows the existence of two activation energies which are attributed to contributions of different relaxation processes.
Biocomposites, Dielectric Relaxation, Kramers-Kronig Relation
Published online 12/10/2016, 5 pages
Copyright © 2016 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA
Citation: L. KREIT, Z. SAMIR, M.E. ACHOUR, A. OUERIAGLI, A. OUTZOURHIT, L.C. COSTA, M. MABROUKI, ‘Studies on the dielectric properties of olive pomace grains reinforced polymer matrix composites’, Materials Research Proceedings, Vol. 1, pp 238-242, 2016
The article was published as article 59 of the book Dielectric Materials and Applications
 A. Hodzic, R. Shanks, Natural Fibre Composites: Materials, Processes and Properties; Woodhead Publishing Series in Composites Science and Engineering, Elsevier Science, 2014.
 I. Ben Amor, H. Rekik, H.Kaddami, M.Raihane, M.Arous and A.Kallel, “Studies of dielectric relaxation in natural fiber-polymer composites”, Journal of Electrostatics 67, 2009, 717-722. http://dx.doi.org/10.1016/j.elstat.2009.06.004
 Z. Samir, Y. el Merabet, M.P.F. Graça, S. Soreto Teixeira, M. E. Achour, L. C. Costa, “Dielectric behavior of carbon nanotube particles filled polyester polymer composites”, J. Comp. Materials, 2016 ( in press). http://dx.doi.org/10.1177/0021998316665682
 M. Wuubbenhorst, J. v. Turnhout, “Analysis of complex dielectric spectra. I. One-dimensional derivative techniques and threedimensional modeling”, Journal of Non Crystalline Solids, 2002,305, 40–49. http://dx.doi.org/10.1016/S0022-3093(02)01086-4
 JR. Macdonald, WR. Kenan, Impedance spectroscopy- Emphasizing solid materials and systems. John Wiley and Sons, New York, Interscience 1987; 368.
 P. Steeman, J. Vanturnhout, “Fine structure in the parameters of dielectric and viscoelastic relaxations”. Macromolecules 1994, 27(19),5421–5427. http://dx.doi.org/10.1021/ma00097a023
 A. Molak, M. Paluch, S. Pawlus, J. Klimontko, Z. Ujma, I. Gruszka, “Electric modulus approach to the analysis of electric relaxation in highly conducting (Na0.75Bi0.25)(Mn0.25Nb0.75)O3 ceramics”, Journal of Physics 2005, 38(9), 1450–1460.
 H. Mingjuan, Z. Kongshuang, “Effect of volume fraction and temperature on dielectric relaxation spectroscopy of suspensions of PS/PANI composite microspheres”, The Journal of Physical Chemistry C 2008, 112, 19412–19422. http://dx.doi.org/10.1021/jp803530m
 Tagmouti, S.E.Bouzit, L.C.Costa, M.P .F .Garça and A.Outzourit “Impedance Spectroscopy of Nanofluids based on Multiwall Carbon Nanotubes”, Spectroscopy Letters, 48:10, 761-7666, 2015. http://dx.doi.org/10.1080/00387010.2015.1034874