Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 1, Issue 6, Pages 1224-1230Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am900101m
Keywords
atomic force microscopy; friction; lubrication; thin films; polymer coatings; poly(L-lysine)-graft-poly(ethylene glycol); polymer architecture; grafting ratio; silicon oxide
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The tribological properties of poly(L-lysine)-graft-poly (ethylene glycol) (PLL-g-PEG)-coated oxide interfaces have been investigated with atomic force microscopy (AFM) as a function of the molecular structure. Polymer-bearing surfaces were obtained via spontaneous adsorption of the polymer onto the oxide substrate from a buffered solution of physiological pH. Interfacial friction of these PLL-g-PEG-coated surfaces was found to be highly dependent on the duration of deposition and the architecture of PLL-g-PEG. In terms of the architecture, the PEG chain length and the grafting ratio (i.e., the molar ratio of L-lysine monomer to PEG side chain) of adsorbed PLL-g-PEG significantly influence the interfacial friction; specifically, friction is reduced as the PEG chain length increases and as the molar ratio of L-lysine monomer to PEG-side chain decreases. The characteristics of the polymer deposition time and the influence of the lysine/PEG grafting ratio are rationalized in terms of spatial packing density considerations.
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