Physico-Mechanical and Dielectric Relaxation Spectroscopy of Fluoroelastomer Nanocomposites: Effects of Graphene Oxide Concentration and Frequency

Graphene oxide (GO) nanoparticles have been used at different concentrations (1-5 wt%) to prepare fluoroelastomer (FKM) nanocomposites. The physico-mechanical features of FKM nanocomposites exhibit an increase in tensile strength, modulus, hardness and elongation at break decrease with increasing co...

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Bibliographic Details
Published in:Ferroelectrics 2024-01, Vol.618 (1), p.110-124
Main Authors: Kumar, Pushpendra, Penta, Santhosh, Mahapatra, Shyama Prasad
Format: Article
Language:English
Subjects:
conductivity
dielectric
Dielectric loss
Dielectric relaxation
Electrical resistivity
Elongation
Fluoroelastomer
Fluoropolymers
Frequency ranges
Frequency variation
Graphene
graphene oxide
Impedance
Nanocomposites
Nanoparticles
Nyquist plots
Percolation
Percolation theory
Relaxation time
Spectrum analysis
Tensile strength
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Summary:Graphene oxide (GO) nanoparticles have been used at different concentrations (1-5 wt%) to prepare fluoroelastomer (FKM) nanocomposites. The physico-mechanical features of FKM nanocomposites exhibit an increase in tensile strength, modulus, hardness and elongation at break decrease with increasing concentration of GO nanoparticles. This is due to the good distribution of GO in FKM rubber. The effect of GO concentration on dielectric performances which includes dielectric loss tangent (tan δ), real impedance, imaginary impedance and electrical conductivity were studied as a function of frequency range 10 −2  -10 5  Hz. The intensity of tan δ peak of FKM nanocomposites has a gradual decrease with frequency as well as their peaks also shifts toward lower frequency region. Variation in spectra of real impedance reveal decreasing behavior with frequency and imaginary impedance characterizes the properties like diminished peak intensity for GO/FKM nanocomposites. The Nyquist plots show good semicircles that exhibit polarity with a single relaxation time. The extent of the GO concentration has a significant impact on the dielectric permittivity of the nanocomposites. Using the percolation theory, it has been determined how frequency affects electrical conductivity. The percolation phenomenon has been discussed using electrical conductivity of GO/FKM nanocomposites and found at 4 wt% GO concentration.
ISSN:0015-0193
1563-5112
DOI:10.1080/00150193.2023.2271320