Strong and efficient self-healing adhesives based on dynamic quaternization cross-links
Strong and efficient self-healing adhesives based on dynamic quaternization cross-links
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DOI：
10.1039/c7ta06650c
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发表时间：
2017-10
影响因子：
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通讯作者：
Junkun Tang;Liqiang Wan;Yan Zhou;H. Pan;Fuwei Huang
中科院分区：
文献类型：
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作者：
Junkun Tang;Liqiang Wan;Yan Zhou;H. Pan;Fuwei Huang
自修复胶粘剂是自修复材料的衍生物，具有显著的可再粘接、可调节和长期粘合的实用潜力。然而，由于难以同时满足高强度和高效自修复性能这两个要求，因此有关SHA的报道极为有限，这可能极大地限制了其应用。在这项研究中，通过在聚（1，2，3-三唑）玻璃化聚（VPTA）粘合剂的动态季铵化交联中引入交替的刚性和柔性链段来克服瓶颈。因此，与报告的SHA（≤7.5 MPa）相比，VPTA粘合剂显示出23.7 MPa的特别高的粘合强度。VPTA胶接接头在完全断裂20次后仍能自愈，且强度均在10 MPa以上，这在国内外文献中很少报道。此外，该粘合剂还表现出优异的耐溶剂性、高耐久性和良好的抗蠕变性。结构设计策略可以作为一种通用的方法，聚合物制备强大的和有效的SHA。
Self-healing adhesives (SHAs) are derivatives of self-healing materials with remarkable practical potential for re-bondable, adjustable and long-term adhesion. However, reports of SHAs are extremely limited because it is difficult to meet both of the two requirements, high strength and efficient self-healing properties, which may greatly limit their application. In this study, the bottleneck is overcome by introducing alternating rigid and flexible segments in the dynamic quaternization cross-links of poly(1,2,3-triazolium) vitrimer (VPTA) adhesives. In consequence, the VPTA adhesive demonstrates a particularly high adhesive strength of 23.7 MPa, compared to the reported SHAs (≤7.5 MPa). The adhesive joints of VPTA can self-heal after it is completely broken 20 times, while maintaining strengths all above 10 MPa, which is rarely reported. Furthermore, this adhesive also exhibits excellent solvent resistance, high durability, and good creep resistance. The structural design strategy may serve as a versatile method for polymers to prepare strong and efficient SHAs.