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Z-Tetraol composition and bonding to the underlying carbon surface

“…Refer- we conclude that the main chain is the significant determinant of the bonding kinetics. Previously, structural differences in the PFPE main chain (e.g., C/O ratio) have been shown to impact the bonding kinetics and the resultant tribological reliability of the finished disks [8,15]. According to Table 1, the chemical structural component that differs the most amongst the three Tetraol samples investigated in Fig.…”

“…The differential rate equation describing the conversion of mobile lubricant A to bonded lubricant B is [8]:…”

“…From these data we conclude that Tetraol bonding on CNx ubiquitously follows k(t) ∝ k B t −1/2 kinetics. The bonding of perfluoropolyethers (PFPEs) to carbon surfaces characterized by this time dependence has been attributed to diffusion-limited one-dimensional kinetics [8].…”

“…Lubricant bonding E-mail address: robert.waltman@hitachigst.com. is achieved by the intermolecular interactions between the polar functional groups of the lubricant and the underlying carbon surface [8]. Since bonding under ambient conditions can be timedependent, the process is often accelerated by annealing or by UV curing [9].…”

The Adhesion of Monomolecular Hydroxyl-terminated Perfluoropolyether Liquid Films on the Sputtered Silicon Nitride Surface as a Function of End Group Acidity and Mobility

“…The impact of configurational entropy on the bonding kinetics of Zdol on surfaces has previously been quantified via main chain effects. These studies revealed the physical adsorbed state of the PFPE on surfaces as being solidlike or liquidlike depending upon the main chain flexibility [31]. For the Zdol-TX system, figure 12 shows a relatively shallower torsional potential for a C-O bond rotation in the OCF 2 CH 2 AOCH 2 CH 2 OH end group over a relatively large 200°C-O bond rotation that could facilitate the motion of the end group.…”