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| - Modification of the Wettability of a Polymeric Substrate by pH Effect.Determination of the Surface Acid Dissociation Constant by ContactAngle Measurements
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| - The wetting properties of a substrate can be changed by chemical reaction. Here, we studied simple materials withacid−base properties, by preparing poly(vinyl chloride) films containing lauric acid. These substrates constitute simplepolymeric surfaces the wettability of which can be easily controlled by the acid−base equilibrium. The roughnessof the material was then varied by adding Aerosil (hydrophobic fumed silica). We then studied the wettability of thesematerials toward aqueous buffer solutions between pH 2 and 12 from contact angle measurements. The variation ofthe contact angle of a droplet of buffer solution with the pH of the solution was described by a simple thermodynamicmodel requiring only two parameters. Thus, we could characterize the acid polymer by an effective surface aciddissociation constant the value of which was consistent with those obtained with a similar surface. We showed thatthe behavior of any substrate could be described even if the surface geometry was not well-known.
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