A highly stretchable autonomous self-healing elastomer
A highly stretchable autonomous self-healing elastomer
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DOI：
10.1038/nchem.2492
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发表时间：
2016-06-01
期刊：
影响因子：
21.8
通讯作者：
Bao, Zhenan
中科院分区：
文献类型：
--
作者：
Li, Cheng-Hui;Wang, Chao;Bao, Zhenan
合成具有生物肌肉特性的材料是一个挑战，这些材料既强壮，又有弹性，而且能够自我修复。在这里，我们报告了一个网络的聚（二甲基硅氧烷）聚合物链交联的配位络合物，结合高拉伸性，高介电强度，自主自愈和机械驱动。愈合过程可以在低至-20摄氏度的温度下进行，并且不会受到表面老化和水分的显著影响。所使用的交联复合物由2，6-吡啶二甲酰胺配体组成，所述配体通过三种不同的相互作用与Fe（III）中心配位：一种强的吡啶基-铁，和两种较弱的羧酰胺基-铁，通过羧酰胺基团的氮和氧原子。因此，铁-配体键可以容易地断裂和重新形成，而铁中心仍然通过与吡啶基环的更强相互作用保持与配体连接，这使得链能够可逆地解折叠和重折叠。我们假设这种行为支持材料的高拉伸性和自我修复能力。
It is a challenge to synthesize materials that possess the properties of biological muscles-strong, elastic and capable of self-healing. Herein we report a network of poly(dimethylsiloxane) polymer chains crosslinked by coordination complexes that combines high stretchability, high dielectric strength, autonomous self-healing and mechanical actuation. The healing process can take place at a temperature as low as -20 degrees C and is not significantly affected by surface ageing and moisture. The crosslinking complexes used consist of 2,6-pyridinedicarboxamide ligands that coordinate to Fe(III) centres through three different interactions: a strong pyridyl-iron one, and two weaker carboxamido-iron ones through both the nitrogen and oxygen atoms of the carboxamide groups. As a result, the iron-ligand bonds can readily break and re-form while the iron centres still remain attached to the ligands through the stronger interaction with the pyridyl ring, which enables reversible unfolding and refolding of the chains. We hypothesize that this behaviour supports the high stretchability and self-healing capability of the material.