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Dielectric relaxation investigations of polyester/CoFe2O4 composites

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Abstract

We present for the first time the study of Raman spectra and dielectric relaxation of polyester polymer-CoFe2O4 (0.0, 5.0, 10.0, 15.0 and 20.0 wt%) nanocomposites. Raman spectroscopy was applied as a sensitive structural identification technique to characterize the polyester-CoFe2O4 nanocomposites. The images of atomic force microscopy (AFM) confirmed the uniform distribution of CoFe2O4 inside the polymer matrix. The dielectric relaxation analyses were carried out on the polyester-CoFe2O4 nanocomposites at different temperatures. An increase in dielectric constant ε1 was observed for all samples with increasing temperatures due to the alignment of the electric dipoles with the applied electric field. In contrast, ε1 decreased with increasing the frequency, which is attributed to the difficulty for the electric dipoles to follow the electric field. The α-relaxation peak at a high frequency moved to higher frequencies after increasing the temperature. The activation energies for Maxwell-Wagner Sillar (MWS) changed from 0.84 to 1.01 eV while the activation energies for α-relaxations were (0.54–0.94 eV). The conduction mechanism for the polyester-CoFe2O4 nanocomposites followed the correlated barrier hopping (CBH) model.

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The data that support the findings of this study are available from the author upon reasonable request.

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The authors extend their appreciation to the Deputyship for Research & Innovation, Ministry of Education in Saudi Arabia for funding this research work through the project number 223202.

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AHA: Writing—Reviewing and Editing. SA: Conceptualization. AI: Writing- Original draft preparation. SAS: Visualization, Investigation. TAT: Conceptualization, Methodology, Writing—Reviewing and Editing.

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Correspondence to Taha Abdel Mohaymen Taha.

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Alshammari, A.H., Alhassan, S., Iraqi, A. et al. Dielectric relaxation investigations of polyester/CoFe2O4 composites. J Mater Sci: Mater Electron 34, 2132 (2023). https://doi.org/10.1007/s10854-023-11548-7

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