Journal
JOURNAL OF COMPOSITE MATERIALS
Volume 44, Issue 13, Pages 1553-1568Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/0021998309353961
Keywords
natural fiber; composite; dielectric relaxation; orientation
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Funding
- Morroco and Tunisia committee [06/TM/85]
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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 degrees 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.
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