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Adhesion Property Profiles of Supported Thin Polymer Films
Citation key balz13
Author Balzer, Bizan N. and Micciulla, Samantha and Dodoo, Samuel and Zerball, Maximilian and Gallei, Markus and Rehahn, Matthias and von Klitzing, Regine and Hugel, Thorsten
Pages 6300–6306
Year 2013
DOI 10.1021/am4013424
Journal Appl. Mater. Interf.
Volume 5
Abstract Polymer coatings are frequently utilized to control and modify substrate properties. The performance of the coatings is often determined by the first polymer layers between the substrate and the bulk polymer material, which are termed interphase. Standard methods have failed to completely characterize this interphase, because its properties change significantly over a few nanometers. Here we determine the spatially resolved adhesion properties of the interphase in polyelectrolyte multilayers (PEMs) by desorbing a single polymer covalently bound to an atomic force microscope cantilever tip from PEMs with varying thickness. We show that the adhesion properties of the first few layers (up to three double layers) is dominated by the surface potential of the substrate, while thicker PEMs are controlled by cohesion in between the PEM polymers. For cohesion, the local film conformation is the crucial parameter. This finding is generalized by utilizing oligoelectrolyte multilayer (OEM) as coatings and both hydrophilic and hydrophobic polymers as polymeric force sensors.
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