Comparative Study of Dielectric Properties of Hybrid Natural Fiber Composites
The dielectric properties, such as dielectric constant, dissipation factor and dielectric loss factor of jute/bamboo natural fibers reinforced with polypropylene and unsaturated polyester hybrid composites were studied with different fiber loadings, fiber ratios, frequencies and chemical modificat...
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| Main Authors: | , , , |
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| Format: | E-Article |
| Language: | English |
| Published: |
Elsevier
2014
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| Subjects: | |
| Online Access: | http://ir.unimas.my/id/eprint/9181/1/Comparative%20Study%20of%20Dielectric%20Properties%20of%20Hybrid%20Natural%20Fiber%20Composites%20%28abstract%29.pdf http://ir.unimas.my/id/eprint/9181/ |
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| Summary: | The dielectric properties, such as dielectric constant, dissipation factor and dielectric loss factor of jute/bamboo natural fibers
reinforced with polypropylene and unsaturated polyester hybrid composites were studied with different fiber loadings, fiber
ratios, frequencies and chemical modifications of natural fibers. The dielectric constant, dissipation factor and loss factor
increased with an increase in the fiber content for the entire range of frequencies than the pure polypropylene and pure
unsaturated polyester materials. This increase was high at low frequencies, low at medium frequencies, and very low at high
frequencies. Dielectric constant values were observed to decrease in frequency due to the decreased interfacial and orientation
polarization at higher frequencies. Whereas, dielectric constant increased with an increase in the fiber loading, due to the increase
in the number of polar groups, after the addition of hydrophilic lignocellulose fibers. Sodium hydroxide treatment was carried out
on jute and bamboo fibers to improve the adhesion between fibers and matrix. The dielectric constant was lower for composites
consisting of fibers subjected to alkaline treatment due to the increased hydrophobicity of fibers. When the weight percentage of
jute fiber was increased in the total fiber content of the hybrid composites, the dielectric constant, dissipation factor and loss
factor were found to increase. It is evident that types of polymer have little influence on the dielectric properties of the hybrid
composites. |
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