Perfluoropolyethers (PFPEs) are widely used as hard disk lubricants for protecting carbon overcoat reducing friction between the\nhard disk interface and the head during themovement of head during reading and writing data in the hard disk.Due to temperature\nrise of PFPE Zdol lubricant molecules on a DLC surface, how polar end groups are detached from lubricant molecules during\ncoating is described considering the effect of temperatures on the bond/break density of PFPE Zdol using the coarse-grained bead\nspring model based on finitely extensible nonlinear elastic potential. As PFPE Z contains no polar end groups, effects of temperature\non the bond/break density (number of broken bonds/total number of bonds) are not so significant like PFPE Zdol. Effects of\ntemperature on the bond/break density of PFPE Z on DLC surface are also discussed with the help of graphical results. How\nbond/break phenomenonaffects the end bead density of PFPE Z and PFPE Zdol on DLC surface is discussed elaborately. How the\noverall bond length of PFPE Zdol increases with the increase of temperature which is responsible for its decomposition is discussed\nwith the help of graphical results. At HAMR condition, as PFPE Z and PFPE Zdol are not suitable lubricant on a hard disk surface,\nit needs more investigations to obtain suitable lubricant.We study the effect of breaking of bonds of nonfunctional lubricant PFPE\nZ, functional lubricants such as PFPE Zdol and PFPE Ztetrao, and multidented functional lubricants such as ARJ-DS, ARJ-DD, and\nOHJ-DS on a DLC substrate with the increase of temperature when heating of all of the lubricants on a DLC substrate is carried\nout isothermally using the coarse-grained bead spring model by molecular dynamics simulations and suitable lubricant is selected\nwhich is suitable on a DLC substrate at high temperature.
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