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A Comprehensive Study of Polyurethane Potting Compounds Doped with Magnesium Oxide Nanoparticles
Jaroslav Hornak1, Jakub Černohous1, Pavel Prosr1
1Department of Materials and Technology, Faculty of Electrical Engineering, University of West Bohemia, 306 14 Pilsen, Czech Republic.
Polymers
|March 29, 2023
Summary
Adding magnesium oxide (MgO) nanoparticles to polyurethanes (PURs) enhances electrical insulation properties and thermal stability. However, this modification leads to reduced mechanical and dielectric strength in PUR materials.
Area of Science:
- Materials Science
- Polymer Science
- Nanotechnology
Background:
- Polyurethanes (PURs) are versatile polymers with significant potential in the electrical industry.
- Enhancing PUR properties through nanoparticle incorporation is an active area of research.
Purpose of the Study:
- To investigate the impact of magnesium oxide (MgO) nanoparticles on the properties of polyurethanes (PURs).
- To evaluate the suitability of MgO-modified PURs for electrical applications.
Main Methods:
- Incorporation of magnesium oxide (MgO) nanoparticles into polyurethane matrices at various weight ratios.
- Comprehensive analysis of electrical, thermal, and mechanical properties of the modified materials.
Main Results:
- MgO incorporation significantly improved volume and surface resistivities (up to +1 order of magnitude).
- Dielectric losses at higher temperatures were reduced by 62%, and thermal stability increased by 30 °C.
- A decrease in dielectric strength (-15%) and a notable reduction in mechanical strength (-37%) were observed.
Conclusions:
- Magnesium oxide nanoparticles enhance key electrical and thermal properties of polyurethanes, making them attractive for electrical applications.
- Trade-offs exist, as mechanical and dielectric strength are compromised, requiring careful material design for specific uses.
