Abstract Epoxidized natural rubber (ENR)/organic-modified layered double hydroxide (O-LDH) nanocomposites were prepared in this work. The O-LDH can participate in the formation of a hydrogen-bonded supramolecular network in the ENR matrix. The network can effectively improve mechanical properties. With 20 phr O-LDH, the stress, strain and Young's modulus of the final ENR/O-LDH nanocomposite increase to 2.80 MPa, 542% and 4.70 MPa, which is 366%, 113% and 427% of the neat ENR, respectively. Meanwhile, the ENR/O-LDH nanocomposites show self-healing behavior due to the dynamic hydrogen-bonded supramolecular network and chain diffusion. The ENR/O-LDH-10 exhibited the highest self-healing efficiency of about 78% (120 °C, 12 h). When the O-LDH content exceeds 10 phr, the restricting effect of fillers weakens the ability to reconstruct hydrogen-bonding, and thus reduces the healing efficiency of the ENR nanocomposites, despite continuous increased mechanical properties. This work opens up many opportunities for creating advanced elastomers that are strong, tough and self-healable through the design of a dynamic supramolecular network.

中文翻译：

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由氢键超分子网络实现的坚固、坚韧和可愈合的弹性体纳米复合材料

摘要 本工作制备了环氧化天然橡胶（ENR）/有机改性层状双氢氧化物（O-LDH）纳米复合材料。O-LDH 可以参与 ENR 基质中氢键超分子网络的形成。网络能有效提高机械性能。使用 20 phr O-LDH，最终 ENR/O-LDH 纳米复合材料的应力、应变和杨氏模量分别增加到 2.80 MPa、542% 和 4.70 MPa，分别是纯 ENR 的 366%、113% 和 427% . 同时，由于动态氢键超分子网络和链扩散，ENR/O-LDH纳米复合材料表现出自修复行为。ENR/O-LDH-10 表现出最高的自愈效率，约为 78%（120°C，12 小时）。当O-LDH含量超过10份时，尽管机械性能不断提高，但填料的限制作用削弱了重建氢键的能力，从而降低了 ENR 纳米复合材料的愈合效率。这项工作为通过动态超分子网络的设计创造强大、坚韧和自愈的先进弹性体开辟了许多机会。