Self-healing and thermoreversible rubber from supramolecular assembly
Self-healing and thermoreversible rubber from supramolecular assembly
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DOI：
10.1038/nature06669
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发表时间：
2008-02-21
期刊：
影响因子：
64.8
通讯作者：
Leibler, Ludwik
中科院分区：
文献类型：
--
作者：
Cordier, Philippe;Tournilhac, Francois;Leibler, Ludwik
橡胶表现出巨大的延伸性，可达数百倍，而普通固体只有几个百分点，并且在释放应力时能够恢复其原始形状和尺寸（1,2）。橡胶弹性是大分子的一种特性，这些大分子要么是共价交联的（1,2），要么是通过小的玻璃或晶体结构域（3-5）、离子聚集体(6)或多个氢键（7-16）等物理结合连接在一个网络中。共价交联或强物理关联防止流动和蠕变。在这里，我们设计并合成了结合在一起的分子，通过氢键形成链和交联。该系统显示出可恢复的可扩展性高达百分之几百，并且在负载下蠕变很小。与由大分子制成的传统交联或热可逆橡胶形成鲜明对比的是，这些系统在断裂或切割时，可以简单地通过将断裂的表面聚集在一起在室温下自愈来修复。修复后的样品恢复了其巨大的可扩展性。破碎和愈合的过程可以重复很多次。这些材料可以很容易地加工、再利用和回收。它们独特的自我修复性能，合成简单，可再生资源的可获得性以及原料（脂肪酸和尿素）的低成本预示着未来的应用前景。
Rubbers exhibit enormous extensibility up to several hundred per cent, compared with a few per cent for ordinary solids, and have the ability to recover their original shape and dimensions on release of stress(1,2). Rubber elasticity is a property of macromolecules that are either covalently cross- linked(1,2) or connected in a network by physical associations such as small glassy or crystalline domains(3-5), ionic aggregates(6) or multiple hydrogen bonds(7-16). Covalent cross-links or strong physical associations prevent flow and creep. Here we design and synthesize molecules that associate together to form both chains and cross-links via hydrogen bonds. The system shows recoverable extensibility up to several hundred per cent and little creep under load. In striking contrast to conventional cross-linked or thermoreversible rubbers made of macromolecules, these systems, when broken or cut, can be simply repaired by bringing together fractured surfaces to self- heal at room temperature. Repaired samples recuperate their enormous extensibility. The process of breaking and healing can be repeated many times. These materials can be easily processed, re- used and recycled. Their unique self-repairing properties, the simplicity of their synthesis, their availability from renewable resources and the low cost of raw ingredients (fatty acids and urea) bode well for future applications.