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Poly(acrylic acid) with disulfide bond for the elaboration of pH-responsive brush surfaces |
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| Authors: | Wim Van Camp Halima Alem Nicolas Willet Anne-Sophie Duwez |
| Affiliation: | a Ghent University, Department of Organic Chemistry, Polymer Chemistry Research Group, Krijgslaan 281 (S4bis), 9000 Ghent, Belgium b Université catholique de Louvain, Unité de Physique et de Chimie des Hauts Polymères, Croix du Sud 1, 1348 Louvain-la-Neuve, Belgium c University of Liège, Department of Chemistry, NanoChemistry and Molecular Systems, B6a Sart-Tilman, 4000 Liège, Belgium |
| Abstract: | We report on a new route for the facile preparation of pH-responsive tethered brushes on metallic surfaces, starting from poly(acrylic acid) (PAA) containing a disulfide (S-S) bond (PAA-S-S-PAA). First, atom transfer radical polymerization (ATRP) of 1-ethoxyethyl acrylate (EEA) with a disulfide-containing initiator was performed to obtain the poly(EEA) precursor polymer (PEEA-S-S-PEEA). Deprotection of PEEA by a heating step resulted in the desired PAA chains without any further purification. The brushes, obtained by the ‘grafting to’ of PAA-S-S-PAA onto gold, were then characterized by atomic force microscopy in water at various pH values. The results evidence a large collapsing/swelling capacity. |
| Keywords: | Poly(acrylic acid) pH-Responsive surface Gold AFM 1-Ethoxyethyl acrylate Disulfide |
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