Boundary Lubricant Film Properties versus Molecular Polarity of Perfluoropolyethers Containing a Pendant Chain

The thin film properties of some novel branched perfluoropolyether (PFPE) boundary lubricants are investigated as a function of molecular polarity and end-group bonding to the underlying carbon film. The PFPE main chain, comprised of n-perfluoroethylene oxide monomer units, is stiffer than the Fombl...

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Bibliographic Details
Published inTribology Online Vol. 7; no. 1; pp. 41 - 45
Main Authors Waltman, Robert J., Deng, Hong, Wu, Yu-Chen, Matsumoto, Hiroyuki
Format Journal Article
LanguageEnglish
Published Japanese Society of Tribologists 01.01.2012
Subjects
Bonding
bonding kinetics
Chains
disk lubricant
Jewelry
Lubricants
Lubrication
Monomers
Oxides
perfluoropolyether
Polarity
surface energy
tribology
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Summary:The thin film properties of some novel branched perfluoropolyether (PFPE) boundary lubricants are investigated as a function of molecular polarity and end-group bonding to the underlying carbon film. The PFPE main chain, comprised of n-perfluoroethylene oxide monomer units, is stiffer than the Fomblin Z main chain that is a copolymer of perfluoro-methylene oxide and -ethylene oxide monomer units. Terraced flow and bonding kinetics show decreased lubricant mobility compared to PFPEs based on a Fomblin Z main chain. Lubricant pick-up is reduced for the tetraol adduct due to the larger Hamaker constant and increased intermolecular cohesion.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
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ISSN:1881-2198
1881-2198
DOI:10.2474/trol.7.41