Abstract
In this study, we prepared two types of PFPE lubricants (D-4OH and DDOH) with different end-groups of molecule. The D-4OH has two endgroups at both side of mainchain. On the other hand, the DDOH has one engroup at ingle side of mainchain. We coated the composite lubricant film by these lubricants on magnetic disks. First, we measured the friction force and the adhesion force on the disks with different lubricant thicknesses of D-4OH and DDOH by pin-on-disk test. Next, we measured these properties on the composite film and compared to these. We found that the adhesion force of D-4OH was lower than that of DDOH, and the friction coefficient of DDOH was lower than that of D-4OH. Composite lubricant film showed lowest the friction force in these lubricant films.
