Reference : SINGLE-MOLECULE AFM STUDY OF ADHESIVE POLYMERS PREPARED BY COBALT-MEDIATED RADICAL POLYM...
Scientific conferences in universities or research centers : Scientific conference in universities or research centers
Physical, chemical, mathematical & earth Sciences : Multidisciplinary, general & others
Physical, chemical, mathematical & earth Sciences : Chemistry
http://hdl.handle.net/2268/131567
SINGLE-MOLECULE AFM STUDY OF ADHESIVE POLYMERS PREPARED BY COBALT-MEDIATED RADICAL POLYMERIZATION AND NITRONE-MEDIATED RADICAL COUPLING
English
Willet, Nicolas mailto [Université de Liège - ULg > Département de chimie (sciences) > Département de chimie (sciences) >]
Sluysmans, Damien mailto [Université de Liège - ULg > > > 2e an. master sc. chimiques, fin. appr.]
Delvaux, Cédric mailto [Université de Liège - ULg > > > 2e an. master sc. chimiques, fin. appr.]
Wislez, Arnaud mailto [Université de Liège - ULg > Département de chimie (sciences) > Nano-chimie et systèmes moléculaires >]
Debuigne, Antoine mailto [Université de Liège - ULg > Département de chimie (sciences) > Chimie des macromolécules et des matériaux organiques >]
Detrembleur, Christophe mailto [Université de Liège - ULg > > Centre d'études et de rech. sur les macromolécules (CERM) >]
Barner-Kowollik, Christopher [Karlsruhe Institute of Technology > Polymerchemie > > >]
Junkers, Thomas [Universiteit Hasselt - UH > > > >]
Duwez, Anne-Sophie mailto [Université de Liège - ULg > Département de chimie (sciences) > Nano-chimie et systèmes moléculaires >]
10-Sep-2012
National
Journée du Département de Chimie
10 septembre 2012
[en] AFM ; Force spectroscopy ; Multivalent ; Polymer ; Polymer architecture ; Radical polymerization
[en] Well-defined poly(vinyl acetate) (PVAc) chains prepared by CMRP (cobalt-mediated radical polymerization) were coupled using an alkyne-functional nitrone via NMRC (nitrone-mediated radical coupling).1 In all the cases, the coupling efficiencies were close to 90% or higher. The polymers mid-chain functionalized with an alkyne group were then reacted with azide-functionalized atomic force microscopy (AFM) tips via copper-catalyzed azide-alkyne cycloaddition (CuAAC). As a result, polymers having a double-branch architecture were linked to AFM tips via a short linker. The structure and the molecular parameters of the polymers were determined by NMR and GPC, whereas the ‘click’ step onto AFM tips was assessed by performing the same CuAAC reaction onto macroscopic surfaces and characterizing them by ATR FT-IR.

The adhesive properties of these double-branched polymers were studied by AFM single-molecule force spectroscopy. By performing approach-retraction cycles in solution upon a glass surface, the interaction between single PVAc chains and the surface was investigated. The effect of the double-branch architecture on the adhesion forces was under focus. Setting a residence time of the tip on the surface before retraction was found to have a beneficial influence on the adhesion forces. Signs of multiple interactions acting in parallel were detected in the experimental force-distance traces.
NanoChem
Researchers ; Students
http://hdl.handle.net/2268/131567

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