| Title |
Electrode Design for Studying the Recovery of Hydrophobic Properties in Polymeric Materials after Corona Discharge |
| Authors |
Hobin Lee ; Bonhyuk Ku ; Hyoungku Kang |
| DOI |
http://doi.org/10.5207/JIEIE.2023.37.6.083 |
| Keywords |
Corona discharge; Hydrophobicity; Insulator; Multiple needle-to-plane electrode; Polymer |
| Abstract |
In 2021, the outdoor polymer standard, IEC 62039, was revised to include a new test method for hydrophobic transition, one of the categories of dynamic hydrophobicity. Furthermore, test parameters related to hydrophobicity maintenance and recovery are scheduled to be incorporated into the standard. One of major characteristics of polymer materials is their ability to recover hydrophobicity over time, even after it has been compromised by factors such as UV radiation, heavy rain, or corona discharge. This is very important in long-term reliability. In this study, a multiple needle-to-plane electrode was designed to temporarily reduce hydrophobicity by generating a corona discharge on the surface of a polymer sample to evaluate hydrophobicity recovery properties. When designing a multiple needle-to-plane electrode, several parameters such as needle tip radius, upper electrode diameter, and gap between the needle electrode and the polymer sample surface are considered to ensure mechanical strength and generate corona discharge evenly across the entire polymer sample surface. |