Self‐Healing Ionomers
Self‐Healing Ionomers
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DOI：
10.1002/9783527670185.ch13
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发表时间：
2013-06
期刊：
影响因子：
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通讯作者：
N. Hohlbein;M. V. Tapavicza;A. Nellesen;A. Schmidt
中科院分区：
文献类型：
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作者：
N. Hohlbein;M. V. Tapavicza;A. Nellesen;A. Schmidt
非共价离子结合在自然界的自我修复过程中起着重要作用。一个例子是阳离子在天然胶乳凝结中的作用。需要这些阳离子来二聚化两个蛋白质分子，并以这种方式使蛋白质附着在乳胶颗粒上，启动基于凝固的伤口修复过程（图13.1）[1，2]。将这一概念转移到合成聚合物的一种可能性是使聚合物链具有离子基团，并向聚合物基质中加入足够的抗衡离子。这些离子基团聚集成更大的复合物，这对分子间结合能力有很大贡献。当这种复合物由于裂纹而被破坏时，它可以在短的松弛期后重新形成。为了使这一概念成功，聚合物基质必须在分子水平上提供足够的流动性，以便聚合物链可以重新排列和相互渗透。通过调整离子含量和使用不同的抗衡离子，可以容易地改变自修复离聚物聚合物的性质。与基于化学愈合反应的其他自愈合概念相比，离聚物愈合过程是可再现的，并为材料提供持久和重复的自愈合功能。
Non-covalent ionic bindings play an important role in nature’s self-healing procedures. One example is the role of cations in the coagulation of natural latex. These cations are needed to dimerize two protein molecules and in this way enable the proteins to attach to latex particles, initiating the coagulation-based wound repair process (Figure 13.1)[1, 2]. A possibility to transfer this concept to synthetic polymers is to equip polymer chains with ionic groups and to add an adequate counter ion to the polymer matrix. These ionic groups aggregate to larger complexes, which contribute strongly to the intermolecular binding capacity. When such a complex is destroyed due to a crack, it can be reformed after a short relaxation period. For this concept to be successful, it is necessary that the polymer matrix provides enough mobility on a molecular level, so that the polymer chains can rearrange and interpenetrate. The properties of a self-healing ionomeric polymer can be easily varied by adapting the ionic content and by using different counterions. In contrast to other self-healing concepts, that are based on a chemical healing-reaction, the ionomeric healing process is reproducible and provides the material with a persistent and repeated self-healing functionality.