MODIFICATION OF POLYMERS BY ADSORPTION PHENOMENA

The adsorption of ions and amphiphilic molecules on solid polymers is investigated by direct force measurements using an atomic force micros cope(AFM). It is shown that electrolyte ions an changing the surface p otentials of the solid polymers as well as their adhesive properties. The experiments show that the interaction with a negatively charged pr obe is dramatically decreased by the adsorption of anions. The adsorpt ion isotherms are determined by zeta potential measurements (streaming potential of flat plates). In presence of adsorbing anions, the attra ctive interaction and the adhesion are reduced and can be eliminated c ompletely. So, even solutions of simple electrolyte ions can be applie d intentionally in order to modify the interaction of polymer surfaces . A wide variety of technological applications becomes accessible.