磁気ディスク表面における分子潤滑膜に及ぼす紫外線照射の効果 : 分子末端基の影響(機械要素,潤滑,工作,生産管理など)

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To investigate the effects of ultraviolet (UV) irradiation on perfluoropolyether (PFPE) lubricants with identical main chains but different end groups, three types of PFPEs (UV sensitive AM3001, less UV sensitive but functional Zdol2000, and less UV sensitive and nonfunctional Z03) coated on magnetic disk surfaces at nanometer thickness were irradiated by 172 nm UV rays, and bonded lubricant thickness, surface energy, and lubricant spreading measurements were subsequently conducted. Over the irradiation time range investigated, Zdol2000 showed a linear increase in bonded thickness, whereas AM3001 and Z03 showed a saturating increase and the saturating bonded thickness matched the gyration diameter (2.8 nm) of bulk AM3001 and the cross-sectional diameter (0.7 nm) of Z03 molecules, respectively. For surface energy, except for Z03, the polar component decreased significantly with UV irradiation compared to the dispersive component, suggesting the preferential effects of UV irradiation on the functional end groups rather than the main chains. Spreading of AM3001 to bare disk surface was drastically decelerated by UV irradiation; for Zdol2000 and Z03, however, it was worth noting that the thickness profiles after UV irradiation changed to a layered structure featuring a forward-spreading shoulder. A peak/valley structure caused by molecular flow from the non-irradiated toward the irradiated areas was observed for functional AM3001 and Zdol2000, but was not observed for nonfunctional Z03.
社団法人日本機械学会の論文
2008-04-25

磁気ディスク表面における分子潤滑膜に及ぼす紫外線照射の効果 : 分子末端基の影響(機械要素,潤滑,工作,生産管理など)

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