Simple routes to self-healing Biology provides many routes for self-healing or repair, but this trait is hard to endow into engineering materials. Although self-repair has been demonstrated for some polymers, it usually required specialized monomers. Urban et al. demonstrate that for a very narrow range of compositions, simple vinyl polymers based on methyl methacrylate and n-butyl acrylate show repeatable self-healing properties (see the Perspective by Sumerlin). A key characteristic of this system is that it relies on van der Waals interactions rather than the reformation of hydrogen or covalent bonds for repair. Science, this issue p. 220; see also p. 150 Commodity monomers are combined via a simple and scalable copolymerization to form self-healing polymers. Self-healing materials are notable for their ability to recover from physical or chemical damage. We report that commodity copolymers, such as poly(methyl methacrylate)/n-butyl acrylate [p(MMA/nBA)] and their derivatives, can self-heal upon mechanical damage. This behavior occurs in a narrow compositional range for copolymer topologies that are preferentially alternating with a random component (alternating/random) and is attributed to favorable interchain van der Waals forces forming key-and-lock interchain junctions. The use of van der Waals forces instead of supramolecular or covalent rebonding or encapsulated reactants eliminates chemical and physical alterations and enables multiple recovery upon mechanical damage without external intervention. Unlike other self-healing approaches, perturbation of ubiquitous van der Waals forces upon mechanical damage is energetically unfavorable for interdigitated alternating/random copolymer motifs that facilitate self-healing under ambient conditions.

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钥匙锁商品自愈共聚物

自愈的简单途径 生物学提供了许多自愈或修复的途径，但这种特性很难赋予工程材料。尽管某些聚合物已经证明可以自我修复，但它通常需要专门的单体。城市等。证明对于非常窄的组合物，基于甲基丙烯酸甲酯和丙烯酸正丁酯的简单乙烯基聚合物显示出可重复的自愈特性（参见 Sumerlin 的观点）。该系统的一个关键特征是它依赖于范德华相互作用而不是氢键或共价键的重新形成来进行修复。科学，这个问题 p。220; 另见第。150 种商品单体通过简单且可扩展的共聚反应结合形成自修复聚合物。自修复材料以其从物理或化学损伤中恢复的能力而著称。我们报告说，商品共聚物，如聚（甲基丙烯酸甲酯）/丙烯酸正丁酯 [p(MMA/nBA)] 及其衍生物，可以在机械损坏时自愈。对于优先与随机组分交替（交替/随机）的共聚物拓扑，这种行为发生在狭窄的组成范围内，这归因于有利的链间范德华力形成钥匙和锁链间连接。使用范德华力代替超分子或共价再键合或封装反应物消除了化学和物理变化，并能够在没有外部干预的情况下在机械损坏时进行多次恢复。与其他自愈方法不同，