Supramolecular motifs in dynamic covalent PEG-hemiaminal organogels

Courtney H. Fox, Gijs M. ter Hurrne, Rudy J. Wojtecki, Gavin O. Jones, Hans W. Horn, E. W. Meijer, Curtis W. Frank, James L. Hedrick () and Jeannette M. García ()
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Courtney H. Fox: Stanford University
Gijs M. ter Hurrne: Eindhoven University of Technology
Rudy J. Wojtecki: IBM Almaden Research Center
Gavin O. Jones: IBM Almaden Research Center
Hans W. Horn: IBM Almaden Research Center
E. W. Meijer: Eindhoven University of Technology
Curtis W. Frank: Stanford University
James L. Hedrick: IBM Almaden Research Center
Jeannette M. García: IBM Almaden Research Center

Nature Communications, 2015, vol. 6, issue 1, 1-8

Abstract: Abstract Dynamic covalent materials are stable materials that possess reversible behaviour triggered by stimuli such as light, redox conditions or temperature; whereas supramolecular crosslinks depend on the equilibrium constant and relative concentrations of crosslinks as a function of temperature. The combination of these two reversible chemistries can allow access to materials with unique properties. Here, we show that this combination of dynamic covalent and supramolecular chemistry can be used to prepare organogels comprising distinct networks. Two materials containing hemiaminal crosslink junctions were synthesized; one material is comprised of dynamic covalent junctions and the other contains hydrogen-bonding bis-hemiaminal moieties. Under specific network synthesis conditions, these materials exhibited self-healing behaviour. This work reports on both the molecular-level detail of hemiaminal crosslink junction formation as well as the macroscopic behaviour of hemiaminal dynamic covalent network (HDCN) elastomeric organogels. These materials have potential applications as elastomeric components in printable materials, cargo carriers and adhesives.

Date: 2015
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DOI: 10.1038/ncomms8417

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