Spreading Profiles of Molecularly Thin Perfluoropolyether Films
作者:
G.W. Tyndall,
T.E. Karis,
M.S. Jhon,
期刊:
Tribology Transactions
(Taylor Available online 1999)
卷期:
Volume 42,
issue 3
页码: 463-470
ISSN:1040-2004
年代: 1999
DOI:10.1080/10402009908982242
出版商: Taylor & Francis Group
关键词: Magnetic Data Storage System Tribology;Perfluoropolyether;Surface Energy, Surface Films/Coatings
数据来源: Taylor
摘要:
Perfluoropolyethers (PFPEs) are widely used as lubricants on magnetic recording media. The mobility of the PFPE on the protective carbon overcoat of the media is widely accepted to be intimately coupled to the resulting tribological performance. The flow properties of molecularly thin films of nonpolar PFPEZ and polar PFPE Zdol fractions on solid surfaces were investigated by measuring the spreading profiles. The spreading of Zdol exhibits terraced profiles with the formation of a molecular foot, a shoulder and a vertical step. To describe these features of Zdol spreading, we measured the Zdol thickness dependence of the surface energy, which is then used to calculate the thickness dependence of the disjoining pressure. The polar component of the Zdol surface energy exhibits oscillations as a function of PFPE thickness. The resulting oscillations in the disjoining pressure can be used to qualitatively describe the origins of terraced spreading. The characteristic Zdol spreading profile and surface energy oscillations of Zdol are attributed to molecular layering induced by polar interactions between the Zdol end-groups and the surface.Presented as a Society of Tribologists and Lubrication Engineers paper at the ASME/STLE Tribology Conference in Toronto, Ontario, Canada, October 26–28, 1998
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