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Ben Amor I.,Laboratoire des Materiaux Composites | Rekik H.,Laboratoire des Materiaux Composites | Kaddami H.,Laboratoire Of Chimie Bioorganique Et Macromolecualire | Raihane M.,Laboratoire Of Chimie Bioorganique Et Macromolecualire | And 2 more authors.
Journal of Composite Materials | Year: 2010

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. © 2010 The Author(s). Source


Amor I.B.,University of Sfax | Ghallabi Z.,University of Sfax | Kaddami H.,Laboratoire Of Chimie Bioorganique Et Macromolecualire | Raihane M.,Laboratoire Of Chimie Bioorganique Et Macromolecualire | And 2 more authors.
Journal of Molecular Liquids | Year: 2010

New structural composite material reinforced with unidirectional natural fibers is prepared. Investigation on the dielectric properties and behavior of the thermoset epoxy composite based on cellulosic fibers has been carried on. For the composite, tree relaxation processes were identified, namely the α mode relaxation associated with the glass transition of the epoxy resin matrix, the relaxation process associated with conductivity occurring as a result of the carrier charges diffusion noted for high temperature above glass transition and low frequencies, and interfacial or Maxwell-Wagner-Sillars relaxation that is attributable to the accumulation of charges at the palm tree fibers/epoxy resin interfaces. © 2010 Elsevier B.V. All rights reserved. Source

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