# 코로나 방전에 노출된 고분자 애자용 실리콘 고무의 표면열화

• Published : 2004.10.01

#### Abstract

In this paper we investigated the characteristics of surface degradation in silicone rubber due to corona exposure and recovery mechanism. It was shown that surface free energy was 22.42 mJ/$m^2$ on initial sample but surface free energy was approximately increased to 71.14 mJ/$m^2$ after 45 minutes. However, surface free energy on silicone rubber after corona discharge treatment was completely recovered within a short time due to diffusion of low molecular weight(LMW) silicone fluid. It was shown that corona discharge insured the increase of diffusible LMW chains, which could lead to recover the surface hydrophobicity. 200～370 g/mol distribution of LMW silicone fluid which was extracted by solvent-extraction with gel permeation chromatography (GPC) was contributed to recovery. The surface degradation characteristics on silicone rubbers and the recovery mechanism based on our results were discussed.

#### References

1. H. Hillborg and U. W. Gedde, 'Hydrophobicity changes in silicone rubber', IEEE Trans. on DEI., Vol. 6, No. 5, p. 703, 1999 https://doi.org/10.1109/94.798127
2. N. Yoshimura and S. Kumagai, 'Electrical and environmental aging of silicone rubber used in outdoor insulation', IEEE Trans. on DEI, Vol. 6, No. 5, p. 632, 1999 https://doi.org/10.1109/94.798120
3. R. Hackam, 'Outdoor HV Composite Polymeric Insulators', IEEE Trans. on DEI, Vol. 6, No. 5, p. 557, 1999 https://doi.org/10.1109/94.798114
4. B. H. Youn, T. H. Lee, and C. S. Huh, 'Changes of surface properties of silicone rubber used for outdoor insulators due to corona discharge', J. of KIIEE(in Korea). Vol. 16, No. 3, p. 37, 2002
5. C. S. Huh, B. H. Youn, and H, G. Cho, 'Effects of ageing factors on low molecular weight silicone fluids contact and surface hydrophobicity in htv silicone rubber', J. of KIEEME(in Korea), Vol. 12, No. 1, p. 1, 1999
6. B. Eliasson and U. Kogelschatz, 'Modeling and Applications of Silent Discharge Plasmas', IEEE Trans. on Plasma Science, Vol. 19, No. 2, p. 309, 1991 https://doi.org/10.1109/27.106829
7. W. ]. M. Samaranayake, Y. Miyahara, T. Namihira, S. Katsuki, R. Hackam, and H. Akiyama, 'Ozone Production Using Pulsed Dielectric Barrier Discharge in Oxygen', IEEE Trans. on DEI, Vol. 7, No. 6, p. 849, 2000 https://doi.org/10.1109/94.891999
8. ]. Heiko, R. Brsch, and E. Wendt, 'The Influence of Temperature on the Recovery of the Hydrophobicity on Silicone Rubber Surfaces', 2000 Conference on Electrical Insulation and Dielectric Phenomena. p. 242, 2000
9. R. S. Gorur, ]. W. Chang, and O. G. Amburgey, 'Surface hydrophobicity of polymer used for outdoor insulation', IEEE Trans. on PD, Vol. 5, No. 4, p. 1923. 1990
10. B. H. Youn, C. Y. Park, and C. S. Huh, 'Effect of surface charges in hydrophobicity and surface potential decay with various surface states of silicone rubber for outdoor insulator', J. of KIEEME(in Korea), Vol. 15, No. 8, p, 678, 2002
11. S. Kumagai and N. Yoshimura, 'Influence of single and multiple environmental stresses on tracking, and erosion of RTV silicone rubber', IEEE Trans. on DEI, Vol. 6, No. 2, p. 211, 1999 https://doi.org/10.1109/94.765912
12. S. H. Kim, E. A. Cherney, R. Hackam, and K. G. Rutherford, 'Chemical changes at the surface of RTV silicone rubber coatings on insulators during dry-band arcing', IEEE Trans. on DEI, Vol. 1, Issue 1, p. 106, 1994 https://doi.org/10.1109/94.300238
13. A. E: Vlasts, and S. M. Gubanski, 'Surface structural. changes of naturally aged silicone and EPDM composite insulators', IEEE Trans. on PD, Vol. 6, No. 2, p. 888, 1991
14. D. H. Han, H. G. Cho, D. P. Kang, and K. E. Min, 'Surface characteristics of silicone rubber processed by corona discharges', J. of KIEEME(in Korea), Vol. 15, No. 2, p. 133, 2002