Mw.ir. T. Vermonden : Supramolecular coordination polymers in water

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30 Mar 2005 16:00
Unit: Wageningen University
Location: Aula (gebouw 362), Gen. Foulkesweg 1, Wageningen
Promotor: prof.dr. E.J.R. Sudhölter (Organic Chemistry)
Co Promotor: dr. A.T.M. Marcelis

 Supramolecular polymers are polymers in which the monomers are held together by non-covalent interactions. In solution these polymers can break and recombine reversibly yielding polymers with an average degree of polymerization. This thesis is devoted to water-soluble coordination polymers, in which the bonds between the monomers are based on metal ion coordination. Using zinc ions and bifunctional ligands, also rings are formed besides linear chains. Viscosity measurements were used to follow the formation of chains and rings as a function of the ratio between metal ions and ligands, the total ligand concentration, and the temperature. Neodymium ions can bind three ligand groups. Combining these metal ions with bifunctional ligands results in network formation. These networks in water yield materials with viscoelastic properties, which were studied using rheology measurements. The rheological properties fit nicely to a earlier described theoretical model for linear reversible polymers.
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