I-5   Jun.-Prof. Felix H. Schacher, JCSM Jena

Site-selective Chemistry in Nanostructured Materials

Jun.-Prof. Dr. Felix H. Schacher*

*Institute of Organic and Macromolecular Chemistry and Jena Centre for Soft Matter, Lessingstraße 8, D-07443 Jena, Germany – www.jcsm.uni-jena.de ↗

Block copolymers represent a unique class of building blocks for the generation of nanostructured materials in different environments – e.g., in films or micellar aggregates of different shape. This is mainly driven by the inherent immiscibility of unlike building blocks, providing us with unrivalled possibilities to equip materials with different chemistry in close spatial proximity. Although being in the focus of research for decades, applications exploiting this potential to date are scarce. We focus on examples which contain at least one segment which can be selectively crosslinked, either using covalent or supramolecular strategies and, ideally, this process is reversible. Here, we try to give two examples where block copolymers can be used in the design of advanced materials:

a) the use of poly(ethylene oxide)-block-poly(furfuryl glycidyl ether) (PEO-b-PFGE) block copolymer ligands with a terminal thiol moiety for the synthesis of well-defined Au nanoparticles; the PFGE segment can be selectively (and reversibly) crosslinked and this allows for preventing ligand exchange reactions upon exposing the Au@PEO-b-PFGE hybrid particles to alternative ligands (also in excess);

b) films of PEO-b-PFGE diblock copolymers of different composition are used as reversibly crosslinkable coatings with tunable periodicity and surface characteristics (hydrophilicity).

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