Fatigue-resistant adhesion of hydrogels.,Nature Communications

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Fatigue-resistant adhesion of hydrogels.
Nature Communications ( IF 14.7 ) Pub Date : 2020-02-26 , DOI: 10.1038/s41467-020-14871-3
Ji Liu _{1,

2} , Shaoting Lin ₂ , Xinyue Liu ₂ , Zhao Qin _{3,

4} , Yueying Yang _{2,

5} , Jianfeng Zang ₅ , Xuanhe Zhao _{2,

6}

Affiliation

The adhesion of soft connective tissues (tendons, ligaments, and cartilages) on bones in many animals can maintain high toughness (∽800 J m-2) over millions of cycles of mechanical loads. Such fatigue-resistant adhesion has not been achieved between synthetic hydrogels and engineering materials, but is highly desirable for diverse applications such as artificial cartilages and tendons, robust antifouling coatings, and hydrogel robots. Inspired by the nanostructured interfaces between tendons/ligaments/cartilages and bones, we report that bonding ordered nanocrystalline domains of synthetic hydrogels on engineering materials can give a fatigue-resistant adhesion with an interfacial fatigue threshold of 800 J m-2, because the fatigue-crack propagation at the interface requires a higher energy to fracture the ordered nanostructures than amorphous polymer chains. Our method enables fatigue-resistant hydrogel coatings on diverse engineering materials with complex geometries. We further demonstrate that the fatigue-resistant hydrogel coatings exhibit low friction and low wear against natural cartilages.

中文翻译：

水凝胶的抗疲劳附着力。

在许多动物的骨骼中，软结缔组织（肌腱，韧带和软骨）在骨骼上的附着力可以在数百万次机械载荷循环中保持高韧性（∽800J m-2）。在合成水凝胶和工程材料之间尚未实现这种抗疲劳粘附性，但对于各种应用（例如人造软骨和肌腱，坚固的防污涂层和水凝胶机器人）非常需要。受肌腱/韧带/软骨与骨骼之间的纳米结构界面的启发，我们报告说，在工程材料上粘结合成水凝胶的有序纳米晶域可以提供耐疲劳性，界面疲劳阈值为800 J m-2，因为与非晶聚合物链相比，界面处的疲劳裂纹扩展需要更高的能量才能使有序的纳米结构断裂。我们的方法可在具有复杂几何形状的多种工程材料上实现抗疲劳水凝胶涂层。我们进一步证明了抗疲劳水凝胶涂层对天然软骨表现出低摩擦和低磨损。

更新日期：2020-02-26

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