Browse > Article

Degradation Characteristics of Perfluoropolyether Lubricant for Computer Hard Disk  

Lee, Ji-Hye (Department of Polymer Science & Engineering, Dankook University)
Chun, Sang-Wook (Department of Polymer Science & Engineering, Dankook University)
Kang, Ho-Jong (Department of Polymer Science & Engineering, Dankook University)
Publication Information
Polymer(Korea) / v.31, no.4, 2007 , pp. 278-282 More about this Journal
Abstract
The degradation characteristics of perfluoropolyether (PFPE) for computer hard disk drive have been investigated. Thermal degradation in PFPE started at $170\;^{\circ}C$ and it was completed at $450\;^{\circ}C$. If PFPE was contacted with wear fragment from slider made by $Al_2O_3{\cdot}TiC$, the thermal degradation was accelerated by the catalytic Lewis acid degradation. The Lewis acid degradation mainly took placed in methylene oride(fluoride) chain scission as well as methylene(fluoride) and hydroxy end chain. As a result, the degradation reaction accomplished as early as at $300\;^{\circ}C$. The photo oxidation due to UV exposure on PFPE caused the chain scission in methylene(fluoride), and end chain in PFPE without chain scission in methylene oxide(fluoride) and then the molecular weight of PFPE increased by expected secondary reactions between formed radicals in the photo oxidation.
Keywords
Perfluoropolyether; lubricant; hard disk drive; Lewis acid degradation; UV degradation;
Citations & Related Records

Times Cited By Web Of Science : 0  (Related Records In Web of Science)
Times Cited By SCOPUS : 1
연도 인용수 순위
1 C. D. Mee and E. D. Daniel, Magnetic Recording Technology, Vol. 1, McGraw-Hill, 1987
2 H. Katayama, M. Hamamoto, J. Sato, Y. Murakami, and K. Kojima, IEEE Trans. Magn., 36, 195 (2000)
3 J. J. M. Ruigrok, R. Coehoorn, S. R. Cumpson, and H. W. Kesteren, J. Appl. Phys., 87, 5398 (2000)
4 P. H. Kasai, W. T. Tang, and P. Wheeler, Appl. Surf. Sci., 51, 201 (1991)
5 F. E. Talke, Wear, 190, 232(1995)
6 W. H. Gumprecht, ASLE Trans., 9, 24 (1966)
7 J. M. Harker, D. W. Brede, R. E. Pattison, G. R. Santana, and L. G. Tuft, IBM J. Res. Dev., 25, 667 (1981)
8 P. H. Kasai and P. Wheeler, Appl. Surf. Sci., 52, 91 (1991)
9 D. D. Saperstein and L. J. Lin, Langmuir, 6, 1522 (1990)
10 F. E. Talke, Wear Journal, 207, 118 (1997)
11 D. Sianesi, A. Pasetti, R. Fontanelli, G. C. Bernardi, and G. Caporiccio, Chim. Ind., 55, 208 (1973)
12 M. Alex, A. Tselikov, and T. McDaniel, IEEE Trans. Magn., 37, 1244 (2001)   DOI
13 J. F. Moulder, J. S. Hannond, and K. L. Smith, Appl. Surf. Sci., 25, 446 (1986)
14 J. J. M. Ruigrok, J. Mag. Soc. Jpn., 25, 313 (2001)