Linear rheology of water-soluble reversible neodymium (III) coordination polymers

T. Vermonden, M.J. van Steenbergen, N.A.M. Besseling, A.T.M. Marcelis, W.E. Hennink, E.J.R. Sudhölter, M.A. Cohen Stuart

Research output: Contribution to journalArticleAcademicpeer-review

111 Citations (Scopus)

Abstract

The rheology of reversible coordination polymer networks in aqueous solution is studied. The polymers are formed by neodymium(III) ions and bifunctional ligands, consisting of two pyridine-2,6-dicarboxylate groups connected at the 4-positions by an ethylene oxide spacer. Neodymium(III) ions can bind three of these terdendate ligand groups. At high concentrations, the polymer networks yield viscoelastic materials, which can be described with the Maxwell model. The scaling of the elastic modulus, relaxation time, and zero-shear viscosity with concentration are in good agreement with the predictions of Cates' model that describes the dynamics of linear equilibrium polymers. This indicates that the networks have only few cross-links and can be described as linear equilibrium polymers. The gels are also thermo-reversible. At high temperatures, fast relaxation was found, resulting in liquidlike behavior. Upon cooling, the viscoelastic properties returned immediately. From the temperature dependence of the relaxation time, an activation energy of 49 kJ/mol was determined for the breaking and reptation of the polymers.
Original languageEnglish
Pages (from-to)15802-15808
JournalJournal of the American Chemical Society
Volume126
Issue number48
DOIs
Publication statusPublished - 2004

Keywords

  • wormlike micelles
  • supramolecular polymers
  • viscoelastic behavior
  • semidilute solutions
  • living polymers
  • dynamics
  • networks
  • reptation
  • copper(i)
  • chains

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