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首页> 外文期刊>Chemistry: A European journal >An Easily Accessible Self-Healing Transparent Film Based on a 2D Supramolecular Network of Hydrogen-Bonding Interactions between Polymeric Chains
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An Easily Accessible Self-Healing Transparent Film Based on a 2D Supramolecular Network of Hydrogen-Bonding Interactions between Polymeric Chains

机译：基于聚合物链间氢键键合相互作用的二维超分子网络的易于访问的自修复透明膜

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摘要

Self-healing polymers hold great promise for the future, enhancing in particular the longevity of polymeric materials. We describe a self-healing covalent polymer, presenting an extensive array of hydrogen-bonding sites based on the combination of urea, urethane, and bis-acyl-hydrazine units. Solvent-cast thin-films prepared by polycondensation of a commercially available dihydrazide and a diisocyanate prepolymer exhibited excellent room temperature autonomous healing with almost full recovery of mechanical properties when two parts of a cut film were overlapped and gently pressed together. This autonomous healing upon damage may be attributed to the supramolecular dynamics of multiple lateral inter-chain hydrogen-bonding interactions between the polymer chains. The solid-state structure of a model compound incorporating the same structural backbone corroborates the existence of an extensive two-dimensional supramolecular hydrogen-bonding network.
机译：自修复聚合物对未来具有广阔的前景，特别是可以提高聚合物材料的寿命。我们描述了一种自我修复的共价聚合物，基于尿素，尿烷和双酰基肼单元的组合，提出了广泛的氢键结合位点。通过将市售二酰肼和二异氰酸酯预聚物缩聚而制备的溶剂流延薄膜表现出优异的室温自愈性，当将切割薄膜的两部分重叠并轻轻压在一起时，其机械性能几乎完全恢复。损伤时的这种自主愈合可归因于聚合物链之间的多个侧链间氢键相互作用的超分子动力学。包含相同结构骨架的模型化合物的固态结构证实了广泛的二维超分子氢键网络的存在。

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