Urethanes as reversible covalent moieties in self-healing polymers
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Kuhl, Nathasha; Abend, Markus; Geithner, Robert; Vitz, Jürgen; Zechel, Stefan; Schmitt, Michael; Popp, Jürgen; Schubert, Ulrich S.; Hager, Martin D.
- Abstract:
- For the first time, reversible covalent urethane units are used for the design of new self-healing polymers. For this purpose, an electron-poor diol was synthesized and utilized as crosslinker to create a dynamic polymer network. Therefore, the diol, butyl methacrylate as well as 2-isocyanato ethyl methacrylate are intermixed and photo-polymerized in a bone-shaped PTFE mold. The resulting test specimens are characterized by DSC, TGA and DMTA and the self-healing behavior is studied using tensile tests. Thereby, healing efficiencies of up to 85% could be reached while the material exhibits good mechanical properties with high E-moduli. Additionally, the self-healing mechanism, which is based on exchange reactions of the reversible urethane moieties, is investigated by Raman as well as temperature dependent IR measurements.
- Research areas:
- Year:
- 2018
- Type of Publication:
- Article
- Journal:
- European Polymer Journal
- Volume:
- 104
- Pages:
- 45 - 50
- DOI:
- 10.1016/j.eurpolymj.2018.04.027