Abstract
Alternating maleic acid copolymers dissolved in aqueous solutions exhibit characteristic two-step dissociation profiles and pH-induced structural transitions in dependence on the comonomer unit. In extension of these findings, we analyzed a set of thin films of maleic acid copolymers (poly(octadecene-alt-maleic acid), POMA; poly(propylene-alt-maleic acid), PPMA; poly(styrene-alt-maleic acid), PSMA) randomly attached to planar glass surfaces by covalent binding. Streaming potential/streaming current measurements with a microslit electrokinetic setup (MES) were applied to determine zeta potential (ζ) and surface conductivity (Kσ) data of the polymer layers in aqueous solutions of varied pH. The results confirmed the two-step dissociation behavior for all immobilized copolymers. A dramatic increase of Kσ was observed for PPMA and PSMAbut not for POMAlayers at alkaline pH values, indicating that electrostatic repulsion of ionized groups controls the extension of the confined layers as long as hydrophobic inte...
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