The wettability of polytetrafluoroethylene film surfaces has been studied by observing the equilibrium advancing contact angle formed by a drop of liquid on the surface. The surface treatment required to give good adhesion to various substrates produces a marked increase in the polarity of the surface as measured by the contact angles with a series of solutions of ethyl alcohol in water. Measurement of the coefficient of kinetic friction shows that the untreated side of treated material has the same coefficient as completely untreated film, but the treated side has a considerably higher friction. This higher friction of the treated surfaces is ascribed to the shearing of junctions in the bulk rather than shearing at the interface.
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A. J. G. Allan (1957) studied this question.
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