Making Highly Elastic and Tough Hydrogels from Doughs,Advanced Materials

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Making Highly Elastic and Tough Hydrogels from Doughs
Advanced Materials ( IF 27.4 ) Pub Date : 2022-09-20 , DOI: 10.1002/adma.202206577
Guodong Nian ₁ , Junsoo Kim ₁ , Xianyang Bao _{1,

2} , Zhigang Suo ₁

Affiliation

A hydrogel is often fabricated from preexisting polymer chains by covalently crosslinking them into a polymer network. The crosslinks make the hydrogel swell-resistant but brittle. This conflict is resolved here by making a hydrogel from a dough. The dough is formed by mixing long polymer chains with a small amount of water and photoinitiator. The dough is then homogenized by kneading and annealing at elevated temperatures, during which the crowded polymer chains densely entangle. The polymer chains are then sparsely crosslinked into a polymer network under an ultraviolet lamp, and submerged in water to swell to equilibrium. The resulting hydrogel is both swell-resistant and tough. The hydrogel also has near-perfect elasticity, high strength, high fatigue resistance, and low friction. The method is demonstrated with two widely used polymers, poly(ethylene glycol) and cellulose. These hydrogels have never been made swell-resistant, elastic, and tough before. The method is generally applicable to synthetic and natural polymers, and is compatible with industrial processing technologies, opening doors to the development of sustainable, high-performance hydrogels.

中文翻译：

用面团制作高弹性和坚韧的水凝胶

水凝胶通常由预先存在的聚合物链通过将它们共价交联成聚合物网络来制造。交联使水凝胶耐溶胀但易碎。通过用面团制作水凝胶解决了这个冲突。面团是由长聚合物链与少量水和光引发剂混合而成。然后通过在高温下捏合和退火使面团均匀化，在此期间拥挤的聚合物链紧密缠绕。然后聚合物链在紫外线灯下稀疏地交联成聚合物网络，并浸入水中膨胀至平衡。由此产生的水凝胶既抗溶胀又坚韧。水凝胶还具有近乎完美的弹性、高强度、高抗疲劳性和低摩擦力。该方法用两种广泛使用的聚合物进行了演示，聚（乙二醇）和纤维素。这些水凝胶以前从未被制成具有抗溶胀性、弹性和韧性的材料。该方法普遍适用于合成和天然聚合物，并与工业加工技术兼容，为开发可持续的高性能水凝胶打开了大门。

更新日期：2022-09-20

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