Tough Supramolecular Polymer Networks with Extreme Stretchability and Fast Room-Temperature Self-Healing
Tough Supramolecular Polymer Networks with Extreme Stretchability and Fast Room-Temperature Self-Healing
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DOI：
10.1002/adma.201605325
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发表时间：
2017-06-13
影响因子：
29.4
通讯作者：
Scherman, Oren A.
中科院分区：
文献类型：
--
作者：
Liu, Ji;Tan, Cindy Soo Yun;Scherman, Oren A.
高坚韧和可拉伸聚合物网络的最新进展突出了可穿戴电子设备和结构生物材料（如软骨）的潜力。对于一些给定的应用，需要包括刚度、强度、韧性、阻尼、抗疲劳性和自修复能力的期望的机械性能的组合。然而，整合这样一组严格的要求在这些聚合物网络的设计和制造中带来了相当大的复杂性和困难，并且很少被实现。在这里，我们描述了通过丙烯酰胺和功能单体的原位共聚来构建超分子聚合物网络，所述功能单体与主体分子葫芦[8]脲（CB[8]）动态络合。高分子量，因此足够的链缠结，结合少量动态CB[8]介导的非共价交联（2.5摩尔%），产生极其可拉伸和坚韧的超分子聚合物网络，在室温下表现出显着的自修复能力。这些超分子聚合物网络可以拉伸超过其原始长度的100倍，并且能够举起2000倍于其重量的物体。主客体复合物的可逆缔合/解离赋予网络显著的能量耗散能力，但也容易在室温下完全自修复。除了其出色的机械性能外，该网络还具有离子导电性和透明性。基于CB[8]的超分子网络可以大规模合成，并表现出优异的机械性能。它们可以很容易地导致作为可穿戴和自我修复的电子设备，传感器和结构生物材料的有前途的用途。
Recent progress on highly tough and stretchable polymer networks has highlighted the potential of wearable electronic devices and structural biomaterials such as cartilage. For some given applications, a combination of desirable mechanical properties including stiffness, strength, toughness, damping, fatigue resistance, and self-healing ability is required. However, integrating such a rigorous set of requirements imposes substantial complexity and difficulty in the design and fabrication of these polymer networks, and has rarely been realized. Here, we describe the construction of supramolecular polymer networks through an in situ copolymerization of acrylamide and functional monomers, which are dynamically complexed with the host molecule cucurbit[8] uril (CB[8]). High molecular weight, thus sufficient chain entanglement, combined with a small-amount dynamic CB[8]-mediated non-covalent crosslinking (2.5 mol%), yields extremely stretchable and tough supramolecular polymer networks, exhibiting remarkable self-healing capability at room temperature. These supramolecular polymer networks can be stretched more than 100x their original length and are able to lift objects 2000x their weight. The reversible association/dissociation of the host-guest complexes bestows the networks with remarkable energy dissipation capability, but also facile complete self-healing at room temperature. In addition to their outstanding mechanical properties, the networks are ionically conductive and transparent. The CB[8]-based supramolecular networks are synthetically accessible in large scale and exhibit outstanding mechanical properties. They could readily lead to the promising use as wearable and self-healable electronic devices, sensors and structural biomaterials.