Dielectric responses of polyurethane/zinc oxide blends for dry-type cast cold-curing resin transformers

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23220%2F21%3A43960941" target="_blank" >RIV/49777513:23220/21:43960941 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.mdpi.com/2073-4360/13/3/375" target="_blank" >https://www.mdpi.com/2073-4360/13/3/375</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/polym13030375" target="_blank" >10.3390/polym13030375</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Dielectric responses of polyurethane/zinc oxide blends for dry-type cast cold-curing resin transformers

Popis výsledku v původním jazyce

The influence of different concentrations (0.5, 1.0, and 2.0 wt.%) of Zinc Oxide (ZnO) filleron the dielectric properties of the cold-curing polyurethane (PU) resin is presented in this study. Forthis purpose, the direct DC conductivity and the broadband dielectric spectroscopy measurementswere used to describe the changes in dielectric responses of PU/ZnO nanocomposites over thefrequency and temperature range, respectively. It can be stated that, the 1.0 wt.% nanoparticlesand lower caused a decrease in the real relative permittivity compared to the pure PU resin, whilethe higher concentration of nanoparticles for frequencies above 1 Hz had the opposite effect. Thepresence of nanoparticles in the polyurethane resin affected the segmental dynamics of the polymerchain and changed a charge distribution in the given system. These changes caused a shift of localrelaxation 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 theα-relaxation and intermediate dipolar effects (IDE).

Název v anglickém jazyce

Dielectric responses of polyurethane/zinc oxide blends for dry-type cast cold-curing resin transformers

Popis výsledku anglicky

The influence of different concentrations (0.5, 1.0, and 2.0 wt.%) of Zinc Oxide (ZnO) filleron the dielectric properties of the cold-curing polyurethane (PU) resin is presented in this study. Forthis purpose, the direct DC conductivity and the broadband dielectric spectroscopy measurementswere used to describe the changes in dielectric responses of PU/ZnO nanocomposites over thefrequency and temperature range, respectively. It can be stated that, the 1.0 wt.% nanoparticlesand lower caused a decrease in the real relative permittivity compared to the pure PU resin, whilethe higher concentration of nanoparticles for frequencies above 1 Hz had the opposite effect. Thepresence of nanoparticles in the polyurethane resin affected the segmental dynamics of the polymerchain and changed a charge distribution in the given system. These changes caused a shift of localrelaxation 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 theα-relaxation and intermediate dipolar effects (IDE).

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20201 - Electrical and electronic engineering

Projekt

<a href="/cs/project/EF18_069%2F0009855" target="_blank" >EF18_069/0009855: Elektrotechnické technologie s vysokým podílem vestavěné inteligence</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Polymers

ISSN

2073-4360

e-ISSN

—

Svazek periodika

13

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

12

Strana od-do

1-12

Kód UT WoS článku

000615425900001

EID výsledku v databázi Scopus

2-s2.0-85100351361