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Updated: May 14, 2026

Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes
Published on: December 24, 2014
Surface interactions surpass carbon-carbon bond: understanding and control of the scission behavior of core-shell
Zhicheng Zheng1, Markus Müllner, Jun Ling
1Makromolekulare Chemie II, Universität Bayreuth, D-95440 Bayreuth, Germany.
Abstract:
A tapping-mode AFM investigation of core-shell cylindrical polymer brushes (CPBs) on mica shows that they can be ruptured upon spin-coating. Three different CPBs were synthesized, having a methacrylate backbone, carrying branches of poly[oligo(ethylene glycol)methacrylate] (POEGMA), POEGMA-block-poly[2-(dimethylamino)ethyl methacrylate] (POEGMA-b-PDMAEMA), and POEGMA-block-poly[2-(methacryloyloxy)ethyl trimethylammoniumiodide] (POEGMA-b-PMETAI). The polymer backbone of core-shell CPB with POEGMA-b-PDMAEMA or POEGMA-b-PMETAI branches is ruptured upon drying on a mica surface, while they are stable in aqueous solution. We propose that the scission behavior is induced by Coulomb interactions between PDMAEMA or PMETAI corona and the solid surface and that this interaction is stronger than one or more carbon-carbon single bonds. We control this scission behavior by tuning the surface interactions through switching the surface nature, varying pH, or adding multivalent counterions. Our study demonstrates that core-shell CPB serves as a template to directly compare the weak intermolecular forces with the strong carbon-carbon covalent bonds.
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