Abstract
We have investigated the resistance of a novel end-functionalized perfluoropolyether (PFPE) lubricant film to slider–disk interactions caused by low-flying sliders. The PFPE lubricant is based on the CF2CF2CF2O main chain monomer unit. Both slider–disk interactions and the formation of lubricant moguls are significantly reduced compared to the Fomblin Z backbone, (CF2O) p –(CF2CF2O) q . These results are interpreted on the basis of ab initio quantum chemical computations that show that the barrier to internal rotation about the C–O bond in the CF2CF2CF2O monomer unit is significantly larger than in the CF2O monomer unit that is bordered by another CF2O monomer unit, ~8 kcal/mol compared to <2 kcal/mol, respectively. It is proposed that main chains containing CF2O monomer units will be very flexible and hence their physical properties will be more sensitive to adhesive and cohesive interactions, while main chains containing CF2CF2O and CF2CF2CF2O monomer units will be comparatively stiffer and hence their physical properties will be less sensitive to adhesive and cohesive interactions.
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