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Polymers
Volume 13
Issue 3
10.3390/polym13030375
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Article

Dielectric Responses of Polyurethane/Zinc Oxide Blends for Dry-Type Cast Cold-Curing Resin Transformers

by
Jozef Kúdelčík
1,
Štefan Hardoň
1,
Pavel Trnka
2,*,
Ondřej Michal
2 and
Jaroslav Hornak
2
1
Department of Physics, Faculty of Electrical Engineering and Information Technology, University of Žilina, 010 26 Žilina, Slovakia
2
Department of Materials and Technology, Faculty of Electrical Engineering, University of West Bohemia, 306 14 Pilsen, Czech Republic
*
Author to whom correspondence should be addressed.
Polymers 2021, 13(3), 375; https://doi.org/10.3390/polym13030375
Submission received: 30 November 2020 / Revised: 20 January 2021 / Accepted: 22 January 2021 / Published: 26 January 2021
(This article belongs to the Special Issue Dielectric Polymers)
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Abstract

The influence of different concentrations (0.5, 1.0, and 2.0 wt.%) of Zinc Oxide (ZnO) filler on the dielectric properties of the cold-curing polyurethane (PU) resin is presented in this study. For this purpose, the direct DC conductivity and the broadband dielectric spectroscopy measurements were used to describe the changes in dielectric responses of PU/ZnO nanocomposites over the frequency and temperature range, respectively. It can be stated that, the 1.0 wt.% nanoparticles and lower caused a decrease in the real relative permittivity compared to the pure PU resin, while the higher concentration of nanoparticles for frequencies above 1 Hz had the opposite effect. The presence of nanoparticles in the polyurethane resin affected the segmental dynamics of the polymer chain and changed a charge distribution in the given system. These changes caused a shift of local relaxation peaks in the spectra of imaginary permittivity and dissipation factor of nanocomposites. It is suggested that the temperature-dependent transition of the electric properties in the nano-composite is closely associated with the α-relaxation and intermediate dipolar effects (IDE).
Keywords: broadband dielectric spectroscopy; dielectric relaxation; dry-type transformers; cold-curing, nanocomposites; polyurethane; zinc oxide broadband dielectric spectroscopy; dielectric relaxation; dry-type transformers; cold-curing, nanocomposites; polyurethane; zinc oxide
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MDPI and ACS Style

Kúdelčík, J.; Hardoň, Š.; Trnka, P.; Michal, O.; Hornak, J. Dielectric Responses of Polyurethane/Zinc Oxide Blends for Dry-Type Cast Cold-Curing Resin Transformers. Polymers 2021, 13, 375. https://doi.org/10.3390/polym13030375

AMA Style

Kúdelčík J, Hardoň Š, Trnka P, Michal O, Hornak J. Dielectric Responses of Polyurethane/Zinc Oxide Blends for Dry-Type Cast Cold-Curing Resin Transformers. Polymers. 2021; 13(3):375. https://doi.org/10.3390/polym13030375

Chicago/Turabian Style

Kúdelčík, Jozef, Štefan Hardoň, Pavel Trnka, Ondřej Michal, and Jaroslav Hornak. 2021. "Dielectric Responses of Polyurethane/Zinc Oxide Blends for Dry-Type Cast Cold-Curing Resin Transformers" Polymers 13, no. 3: 375. https://doi.org/10.3390/polym13030375

APA Style

Kúdelčík, J., Hardoň, Š., Trnka, P., Michal, O., & Hornak, J. (2021). Dielectric Responses of Polyurethane/Zinc Oxide Blends for Dry-Type Cast Cold-Curing Resin Transformers. Polymers, 13(3), 375. https://doi.org/10.3390/polym13030375

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