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A highly stretchable, transparent, notch-insensitive self-healing elastomer for coating

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Abstract

To date, transparent polymeric elastomers with high mechanical toughness and excellent self-healing ability have shown attractive prospects in various fields. However, it is difficult to balance the trade-off between self-healing and mechanical performance, and it is even harder to get a transparent one. Herein, novel polyurea materials, which were cross-linked by rationally designed multi-strength hydrogen bonding interactions as well as covalent bonds, were developed. Covalent cross-links enabled high strength, while multi-strength hydrogen bonds as dynamic cross-links ensured elasticity, energy dissipation and rapid self-healing at room temperature. The designed polymer exhibited exceptional mechanical properties such as high elongation at break (over 1600%), notch-insensitive stretchability (800%), and high toughness of 12 500 J m−2. Additionally, it was observed that the polymer could achieve up to 100% self-healing efficiency after 6 h without any external stimuli and an average transmittance of 92.8% at a film thickness of only 1.3 mm. After scratching, the film could still regain its transparency. Notably, this robust, transparent, stretchable, and self-healing elastomer can be employed as an optical protective coating against damage and will open a new avenue for next-generation sustainable optical-electrical and display screen devices.

Graphical abstract: A highly stretchable, transparent, notch-insensitive self-healing elastomer for coating

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Article information


Submitted
13 Oct 2019
Accepted
19 Dec 2019
First published
20 Dec 2019

J. Mater. Chem. C, 2020, Advance Article
Article type
Paper

A highly stretchable, transparent, notch-insensitive self-healing elastomer for coating

L. Zhang, D. Wang, L. Xu, X. Zhang, A. Zhang and Y. Xu, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/C9TC05612B

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