Characterization of Dielectric Relaxation Process by Impedance Spectroscopy for Polymers: Nitrile Butadiene Rubber and Ethylene Propylene Diene Monomer

We invented a dispersion analysis program that analyzes the relaxation processes from dielectric permittivity based on a combination of the Havriliak–Negami and conductivity contribution functions. By applying the created program to polymers such as nitrile butadiene rubber (NBR) and ethylene propyl...

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Bibliographic Details
Published in:Journal of spectroscopy (Hindawi) 2020, Vol.2020 (2020), p.1-15
Main Authors: Tak, Nae Hyung, Kim, Gyung Hyun, Moon, Young Il, Jung, Jae Kap
Format: Article
Language:English
Subjects:
Artificial rubber
Butadiene
Carbon black
Dielectric relaxation
Dipoles
Ethylene
Glass transition temperature
Hydrogen
Investigations
Molecular chains
Monomers
Nitrile rubber
Polymers
Process parameters
Propylene
Room temperature
Spectrum analysis
Temperature
Temperature dependence
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Summary:We invented a dispersion analysis program that analyzes the relaxation processes from dielectric permittivity based on a combination of the Havriliak–Negami and conductivity contribution functions. By applying the created program to polymers such as nitrile butadiene rubber (NBR) and ethylene propylene diene monomer (EPDM), several relaxation processes were characterized: an α process due to segmental motions of the C-C bond, an α′ process attributed to fluctuations in the end-to-end dipole vector of the polymer chain, the conduction contribution by the filler observed above room temperature, and secondary relaxation processes β and γ of motion for the side group in NBR. In the EPDM specimen, the β process associated with the rotational motion of the side groups, the α process associated with the relaxation of local segmental motion, and the αβ process associated with the origin of the β process at high temperatures above 305 K were observed. The Maxwell–Wagner–Sillars effect and conduction contribution were also presented. The molecular chains responsible for the relaxation processes were assigned by building molecular models of the two polymers. The temperature dependence of the relaxation strength and the shape parameters that characterize the process were investigated. From the temperature-dependent relaxation analysis, the merged αβ process, activation energy, and glass transition temperature were determined and compared.
ISSN:2314-4920
2314-4939
DOI:10.1155/2020/8815492