期刊
NATURE COMMUNICATIONS
卷 10, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-019-09130-z
关键词
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资金
- National Natural Science Foundation of China [21631006, 21771100]
- Natural Science Foundation of Jiangsu Province [BK20170016, BK20151377]
- project of the Scientific and Technological Support Program in Jiangsu Province [BE2014147-2]
- Fundamental Research Funds for the Central Universities [020514380147]
- National Postdoctoral Program for Innovative Talents [BX20180136]
There is often a trade-off between mechanical properties (modulus and toughness) and dynamic self-healing. Here we report the design and synthesis of a polymer containing thermodynamically stable whilst kinetically labile coordination complex to address this conundrum. The Zn-Hbimcp (Hbimcp = 2,6-bis((imino) methyl)-4-chlorophenol) coordination bond used in this work has a relatively large association constant (2.2 x 10(11)) but also undergoes fast and reversible intra- and inter-molecular ligand exchange processes. The as-prepared Zn(Hbimcp)(2)-PDMS polymer is highly stretchable (up to 2400% strain) with a high toughness of 29.3 MJ m(-3), and can autonomously self-heal at room temperature. Control experiments showed that the optimal combination of its bond strength and bond dynamics is responsible for the material's mechanical toughness and self-healing property. This molecular design concept points out a promising direction for the preparation of self-healing polymers with excellent mechanical properties. We further show this type of polymer can be potentially used as energy absorbing material.
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