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The Effect of UV Stabilizer on the Photo Degradation of Perfluoropolyether Lubricants Used in Hard Disk

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Abstract

Ultraviolet (UV) light exposure can lead to photo degradation of perfluoropolyether (PFPE) lubricants, resulting in a change of their physical properties. In this article, 2,3,4,5,6–pentafluorobenzophenone was used as an ultraviolet stabilizer (UVS) to slow down the photo degradation of PFPE. PFPE/UVS mixtures were exposed to UV light and the mechanism of photo degradation was studied with nuclear magnetic resonance (NMR). Small amounts of UVS (less than 0.3 wt.%) were found to effectively stabilize both UV photo degradation at the main chain and the end chain of PFPE without affecting the thermal stability of PFPE. However, phase separation of PFPE and UVS was found to occur due to chemical incompatibility of the components.

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Acknowledgments

The author would like to acknowledge Dr. George Tyndall of Samsung and Dr. Bob Waltman of Hitachi for supplying us with Z-DOL.

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Authors and Affiliations

  1. Department of Polymer Science and Engineering, Dankook University, Youngsan-ku, Hannam-dong San#9, Seoul, 140-714, Korea

    Jihye Lee & Ho-Jong Kang

  2. Production R&D Institute Film Team, Hyosung Corp., 183-2, Hoge-Dong, Dongan-Ku, Anyang-Si, Gyunggi-Do, 431-080, Korea

    Sang-Wook Chun

  3. Center for Magnetic Recording Research, University of California, 9500 Gilman Drive, La Jolla, San Diego, CA, 92093-0401, USA

    Frank E. Talke

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  1. Jihye Lee
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  2. Sang-Wook Chun
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  3. Ho-Jong Kang
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  4. Frank E. Talke
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Correspondence to Ho-Jong Kang.

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Lee, J., Chun, SW., Kang, HJ. et al. The Effect of UV Stabilizer on the Photo Degradation of Perfluoropolyether Lubricants Used in Hard Disk. Tribol Lett 28, 117–121 (2007). https://doi.org/10.1007/s11249-007-9255-4

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  • DOI: https://doi.org/10.1007/s11249-007-9255-4

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