The dynamic dielectrical analysis of short palm tree lignocellulosic fiber-reinforced polyester composites was carried out with special reference to the effect of fiber orientation, frequency, and temperature. Measurements were performed in the temperature range 40—200°C and in the frequency range 1—100 kHz. Three relaxations processes were identified, namely the orientation polarization imputed to the presence of polar water molecules in palm fiber, the relaxation process associated with conductivity occurring as a result of the carriers charges diffusion noted for high temperature above glass transition and low frequencies, and the interfacial or Maxwell—Wagner—Sillars relaxation that is attributable to the accumulation of charges at the palm fibers/polyester interfaces. The orientation of the fiber can strongly influence the dielectrical properties and interfacial polarization processes in composites.
Arbelaiz, A., Fernandez, B., Cantero, G., Llano-Ponte, R., Valea, A. and Monfragon, I. ( 2005). Mechanical Properties of Flax Fibre/Polypropylene Composite. Influence of Fibre/Matrix Modification and Glass Fibre Hybridization, Composite Part A: Applied Science and Manufacturing, 36(12): 1637.
2.
Pothan, L.A., Oommen, Z. and Tomas, S. ( 2003). Dynamic Mechanical Analysis of Banana Fiber Reinforced Polyester Composites, Composite Science and Technology, 63(2): 283.
3.
Wang, W., Sain, M. and Cooper, P.A. ( 2006). Study of Moisture Absorption in Natural Fiber Plastic Composites, Composite Science and Technology, 66(3-4): 379.
4.
Kaddami, H., Dufresne, A., Khelifi, B., Bendahou, A., Taourirte, M., Raihane, M., Issartel, N., Sautereau, H., Gérard, J.F. and Sami, N. ( 2006). Short Palm Tree Fibres - Thermoset Matrices Composites, Compos. Part A, 37(9): 1413.
5.
Chand, N. and Jain, D. ( 2005). Effect of Sisal Fibre Orientation on Electrical Properties of Sisal Fibre Reinforced Epoxy Composites, Composite Part A, 36(5): 594.
6.
Paul, A., Joseph, K. and Sabu, T. ( 1997). Effect of Surface Treatments on the Electrical Properties of Low- Density Polyethylene Composite Reinforced with Short Sisal Fibers, Comp. Sci. Technol., 57(1): 67.
7.
Bendahou, A. , Kaddami, H., Sautereau, H., Raihane, M., Erchiqui, F. and Dufresne, A. (2008). Short Palm Tree Fibers Polyolefin Composites: Effect of Filler Content and Coupling Agent of Physical Properties, Macromol. Mater. Eng., 293(20): 140.
8.
Hammami, H., Arous, M., Lagche, M. and Kallel, K. ( 2006). Experimantal Study of Relaxations in Unidirectional Piezoelectric Composites, Composite Part A, 37(1): 1.
9.
Tsangaris, G.M. , Psarras, G.C. and Kontopoulos , A. (1991). Dielectric Permittivity and Loss of an Aluminium Filled Epoxy Resin, J Non-Crystalline Solids Part 2, 131: 1164.
10.
Arous, M., Ben Amor, I., Kallel, A., Fakhfakh, Z. and Perrier, G. ( 2007). J. Phys. Chem. Solids, 68(6): 1405.
11.
Kanapitsas, A., Pissis, P. and Kotsilkova, R. (2002). Molecular Relaxation in Anisotropic Composites Based on (hydroxypropyl) Cellulose and Acrylic Polymer , J. Non-Cryst. Solids, 305(8): 204.
12.
Roberts, J.C. (1996). Book Review: The Chemistry of Paper, Polymer International, 45(4): 427.
13.
Arous, M., Ben Amor, I., Boufi, S. and Kallel, A. ( 2007). Experimental Study on Dielectric Relaxation in Alfa Fiber Reinforced Epoxy Composites, J. Appl. Poly. Sci, 106(6): 3631.
14.
Okrassa, L. , Boiteux, G., Ulanski, J. and Seytre, G. (2001). Molecular Relaxation in Anisotropic Composites Based on (hydroxypropyl) Cellulose and Acrylic Polymer , Polymer, 42(8): 3817.
15.
Tsangaris, G.M., Psarras, G.C. and Kouloumbi , N. (1998). Electric Modulus and Interfacial Polarization in Composite Polymeric Systems , J. Mat. Sci., 33(8): 2027.
16.
Mohamed, K. , Moussi, F. and Harmon, J.P. (2006). Dielectric Analyses of a Series of Poly(2-hydroxyethyl methacrylate-co-2,3 dihydroxypropyl methacrylate) Copolymer, Polymer, 47(12): 3856.
17.
Psarras, G.C. , Manolkaki, E. and Tsangaris, G.M. (2002). Electrical Relaxations in Polymeric Particulate Composites of Epoxy Resin and Metal Particles, Composite Part A, 33(3): 375.
18.
Hakme, C., Stevenson, I., David, L., Seytre, G. and Boiteux, G. ( 2006). Maxwell-Wagner -Sillars Relaxations Polystyrene Glass- Bead Composites, Journal of Non-Crystalline Solids, 352(6): 4750.
19.
Perrier, G. and Bergeret, A. (1995). Effect of Orientation and Crystallization on Dielectric Relaxations in Uniaxially Stretched Poly (ethylene naphthalene-2,6 dicarboxylate (PEN) Films, J. Appl. Phys., 77(42-49): 2651.
20.
Arous, M., Kallel, A., Fakhfakh, Z. and Perrier, G. ( 1997). Dielectric Spectroscopy of Amorphous Thermoplastic/Glass Bead Composites, Journal of the Physical Society of Japan , 66: 3665.
21.
Howard, W., Starkweather, J.R. and Avakian, P. ( 1992). Conductivity and the Electric Modulus in Polymers, J. Polym. Sci.: Part B, 30(6): 637.
22.
Puértolas, J.A., Castro, M., Telleria, I. and Alegria, A. (1999). Analysis of the Relaxations on Polymers from the Real Part of a General Complex Susceptibility. Application to Dielectric Relaxations, J. Polym. Sci.: Part B, 37(12): 1337.
