Surface free energy of polypropylene and polycarbonate solidifying at different solid surfaces

The γstot of modified PP and PC surfaces depend on the kind of probe liquid and contacted solid surface. The modified PP γstot values determined from CAH of polar liquids are greater than that of original surface and they increase in the sequence: Teflon, glass, stainless steel surface, at which they solidified. No clear dependence is observed between γstot and dielectric constant or dipole moment of the polar probe liquids. The changes in γstot of the polymer surfaces are due to the polymer nature and changes in its surface structure caused by the structure and force field of the contacting solid. It has been confirmed by AFM images.