Main Chain Effects in Tetraol-Functionalized Perfluoropolyethers

Main Chain Effects in Tetraol-Functionalized Perfluoropolyethers

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The interfacial properties of perfluoropolyether Digestion (PFPE) films having the [(CF2)nO] main chain with n = 1.5, 3 and 4, were systematically compared on carbon surfaces.The monolayer thickness decreases with increasing n, indicating that stiffer chains (larger n) lie flatter on the surface.The surface energy-derived disjoining pressure Dryer Belt Break Switch also increased with increasing n.Spin-stand tribological experiments indicated that clearance (slider-disk spacing) increased and PFPE lubricant pick-up decreased with increasing disjoining pressure and main chain stiffness.

Slider wear rate increased with decreasing PFPE coverage and increasing main chain stiffness.Structure-property correlations are developed and discussed.