Density functional study of wetting by polymers. I. Effects of polymer length and surface potential

Forsman, J.; Woodward, C. E.; Freasier, B. C.
March 2002
Journal of Chemical Physics;3/15/2002, Vol. 116 Issue 11, p4715
Academic Journal
Wetting by a polymer fluid at an attractive surface is investigated using density functional theory. It is shown that the qualitative behavior of the wetting temperature, T[sub w], as a function of the polymer length, depends on the strength of the surface potential. Defining T[sub c] as the bulk critical temperature, we find that the normalized wetting temperature, T[sub w]/T[sub c], shows nonmonotonic dependence on polymer length. For weak surface potentials, T[sub w]/T[sub c] increases with polymer length and, in some cases, wetting seems to be suppressed. It is conjectured that this may occur via an encroaching drying transition. © 2002 American Institute of Physics.


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