Self-healing materials feature the unique property to recover their original properties after a mechanical damage. One possibility to design such materials is the utilization of metal-ligand interactions (and/or ionic interactions). Terpyridine-based polymeric materials have been utilized to fabricate differently crosslinked systems; the kind of the metal ion (e.g., Fe(II) in Figure 1) as well as the counter ion have been varied. The choice of the corresponding metal salt has a great impact on the self-healing ability. The required healing temperature for these intrinsic self-healing materials can be varied between 80 to 100 �C. Furthermore, the underlying mechanism of the self-healing process was studied in detail by different methods (e.g., SAXS, theoretical calculation and temperature-depending Raman-spectroscopy). As a result, the self-healing is strongly dependent on the presence of ionic clusters as well as the binding strength of the metal complex.  Figure 1. Left: Schematic representation of a self-healing metallopolymer. Right: Self-healing of the crosslinked polymer network with lauryl methacrylate as comonomer and iron(II) sulfate as metal salt: a) Polymer film, b) scratch, c) partial healing after 16 hours at 100 �C and d) healing after 82 hours at 100 �C.[1]References:1)    S. Bode, L. Zedler, F. H. Schacher, B. Dietzek, M. Schmitt, J. Popp, M. D. Hager, U. S. Schubert, Adv. Mater. 2013 , 25, 1634�1638.

Self-healing materials based on supramolecular interactions � from metal-ligand interactions to ionic interactions

248th National Meeting (2014)

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