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Dielectric spectroscopic analysis of polyvinyl chloride nanocomposites loaded with Fe 2 O 3 nanocrystals
Author(s) -
Mansour Sh. A.,
Elsad R. A.,
Izzularab M. A.
Publication year - 2018
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.4359
Subject(s) - materials science , nanocomposite , dielectric , hematite , polyvinyl chloride , dielectric loss , dissipation factor , spinel , permittivity , fourier transform infrared spectroscopy , composite material , conductivity , analytical chemistry (journal) , chemical engineering , metallurgy , chemistry , organic chemistry , optoelectronics , engineering
Iron oxide (α‐Fe 2 O 3 ) nanocrystals powder was successfully synthesized via the sol‐gel method. The microstructural examination of the synthesized nanocrystals confirmed the formation of α‐Fe 2 O3 (hematite) structure using X‐ray diffraction and Fourier transform infrared. The synthesized nano‐hematite powder with different weight percentage up to 5 wt% was introduced to polyvinyl chloride (PVC) to fabricate PVC/Fe 2 O 3 nanocomposites using the solution‐cast technique. The dielectric spectroscopic analysis for the investigated samples has been studied at room temperature and at different temperatures up to 120°C. The real part of the permittivity (ε ′ ) exhibited a significant dependence on filler concentrations throughout whole temperature range. However, the dependency of both of the loss tangent ( tanδ ) and AC conductivity ( σ ac ) on filler concentrations is more pronounced at temperatures higher than room temperature. The obtained values of tan δ for the investigated nancomposites referred to the α‐relaxation around 70°C, which is close to glass transition temperature of the investigated PVC. The dependency of the dielectric strength on Fe 2 O 3 nanofiller concentration was observed with enhancement in the dielectric strength reach to 20.5% for PVC/0.7 wt% Fe 2 O 3 nanocomposite higher than the recorded value for the pristine PVC.