The interfacial properties of a rubber blended polypropylene were investigated by the combination of complementary techniques in order to characterize the e †ects of di †erent surface treatments. The wettability was investigated by contact angle measurements with water, streaming potential measurements indicated the acidity/basicity of the surfaces, and X-ray photoelectron spectroscopy (XPS) identiÐed the chemical BrÔnsted elements, which were incorporated by the various treatments. The topography and the roughness of the samples were quantitatively analyzed by scanning force microscopy (SFM). Direct force measurements showed the possibility of changing the sign of the surface charge by choosing suitable bu †er solutions, leading to attraction and repulsion to the tip, respectively. In the case of technical-type polymer samples used in Si 3 N 4 this study, direct force measurements are in exact agreement with the streaming potential measurements and o †er a valuable tool for interface characterization.
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