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Complex Permittivity Characteristics of Epoxy Nanocomposites at Low Frequencies

DSpace at IIT Bombay

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Title Complex Permittivity Characteristics of Epoxy Nanocomposites at Low Frequencies
 
Creator SINGHA, S
THOMAS, MJ
KULKARNI, A
 
Subject spectroscopy
systems
epoxy nanocomposites
nanodielectrics
permittivity
tan delta
interfacial polarization
conductivity
cole-cole plot
electric modulus
 
Description The complex permittivity characteristics of epoxy nanocomposite systems were examined and an attempt has been made to understand the underlying physics governing some of the unique macroscopic dielectric behaviors. The experimental investigations were performed using two different nanocomposite systems with low filler concentrations over the frequency range of 10(-2)-400 Hz, but for some cases, the data has been reported upto 10(6) Hz for a better understanding of the behaviors. Results demonstrate that nanocomposites do possess unique permittivity behaviors as compared to those already known for unfilled polymer and microcomposite systems. The nanocomposite real permittivity and tan delta values are found to be lower than that of unfilled epoxy. In addition, results show that interfacial polarization and charge carrier mobilities are suppressed in epoxy nanocomposite systems. The complex permittivity spectra coupled with the ac conductivity characteristics with respect to frequency was found to be sufficient to identify several of the nanocomposite characteristics like the reduction in permittivity values, reduction in the interfacial polarization mechanisms and the electrical conduction behaviors. Analysis of the results are also performed using electric modulus formalisms and it has been seen that the nanocomposite dielectric behaviors at low frequencies can also be explained clearly using this formalism.
 
Publisher IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
 
Date 2011-07-31T22:52:35Z
2011-12-26T12:53:11Z
2011-12-27T05:40:23Z
2011-07-31T22:52:35Z
2011-12-26T12:53:11Z
2011-12-27T05:40:23Z
2010
 
Type Article
 
Identifier IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION, 17(4), 1249-1258
1070-9878
http://dspace.library.iitb.ac.in/xmlui/handle/10054/8263
http://hdl.handle.net/10054/8263
 
Language en