Urethanes as reversible covalent moieties in self-healing polymers

N. Kuhl; M. Abend; R. Geitner; J. Vitz; Stefan Zechel; M. Schmitt; Jürgen Popp; Ulrich S. Schubert; Martin D. Hager

doi:10.1016/j.eurpolymj.2018.04.027

Urethanes as reversible covalent moieties in self-healing polymers

N. Kuhl, M. Abend, R. Geitner, J. Vitz, Stefan Zechel, M. Schmitt, Jürgen Popp, Ulrich S. Schubert, Martin D. Hager

Research output: Contribution to journal › Article › Academic › peer-review

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.

Original language	English
Pages (from-to)	45-50
Number of pages	6
Journal	European Polymer Journal
Volume	104
DOIs	https://doi.org/10.1016/j.eurpolymj.2018.04.027
Publication status	Published - 1 Jul 2018
Externally published	Yes

Funding

The authors thank the Deutsche Forschungsgemeinschaft (DFG, SPP 1568; projects PO563/25 2, DI1517/9 1, HA6306/3-1 and SCHU1229/13-1) for financial support. Furthermore, S.Z. is grateful to the Carl-Zeiss foundation for funding. We would further like to acknowledge the NMR-platform of the Friedrich Schiller University Jena for support in NMR spectroscopy. Moreover, we thank Renzo Paulus for his help with the DSC and TGA measurements and Moritz von der Lühe for his support concerning the IR measurements. Appendix A

Keywords

Blocked isocyanates
Polyurethanes
Self-healing polymers

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10.1016/j.eurpolymj.2018.04.027

Cite this

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title = "Urethanes as reversible covalent moieties in self-healing polymers",

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.",

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AU - Kuhl, N.

AU - Abend, M.

AU - Geitner, R.

AU - Vitz, J.

AU - Zechel, Stefan

AU - Schmitt, M.

AU - Popp, Jürgen

AU - Schubert, Ulrich S.

AU - Hager, Martin D.

PY - 2018/7/1

Y1 - 2018/7/1

N2 - 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.

AB - 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.

KW - Blocked isocyanates

KW - Polyurethanes

KW - Self-healing polymers

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VL - 104

SP - 45

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JO - European Polymer Journal

JF - European Polymer Journal

ER -

Urethanes as reversible covalent moieties in self-healing polymers

Abstract

Funding

Keywords

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