Highly Elastic and Ultratough Hybrid Ionic–Covalent Hydrogels with Tunable Structures and Mechanics,Advanced Materials

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Highly Elastic and Ultratough Hybrid Ionic–Covalent Hydrogels with Tunable Structures and Mechanics
Advanced Materials ( IF 27.4 ) Pub Date : 2018-03-25 , DOI: 10.1002/adma.201707071
Yanyu Yang _{1,

2,

3} , Xing Wang _{1,

2} , Fei Yang _{1,

2} , Luning Wang ₄ , Decheng Wu _{1,

2}

Affiliation

Hybrid ionically–covalently crosslinked double‐network (DN) hydrogels are attracting increasing attention on account of their self‐recovery ability and fatigue resistance, but their relative low mechanical strength and tedious performance adjustment severely limit their applications. Herein, a new strategy to concurrently fabricate hybrid ionic–covalent DN hydrogels and modulate their structures and mechanics is reported, in which an in situ formed chitosan ionic network is incorporated by post‐crosslinking the chitosan‐based composite hydrogel using multivalent anions solutions. The obtained hybrid DN hydrogels exhibit predominant mechanical properties including superior elastic modulus, high tensile strength, and ultrahigh fracture energy because of the more efficient energy dissipation of rigid short‐chain chitosan network. Notably, the swollen hydrogels still remain mechanically strong and tough even after immersion in water for 24 h. More significantly, simply changing the post‐crosslinking time can vary the compactness and rigidity of the chitosan network in situ, achieving flexible and efficient modulation of the structures and mechanics of the hybrid DN hydrogels. This study opens up a new horizon in the preparation and regulation of DN hydrogels for promising applications in tissue scaffolds, actuators, and wearable devices.

中文翻译：

具有可调结构和力学特性的高弹性和超韧性混合离子共价水凝胶

混合离子共价交联双网络（DN）水凝胶因其自恢复能力和抗疲劳性而受到越来越多的关注，但其相对较低的机械强度和繁琐的性能调整严重限制了其应用。本文报道了一种同时制备混合离子-共价DN水凝胶并调节其结构和力学的新策略，其中通过使用多价阴离子溶液对壳聚糖基复合水凝胶进行后交联，从而结合了原位形成的壳聚糖离子网络。由于刚性短链壳聚糖网络的能量消耗效率更高，因此获得的杂化DN水凝胶具有主要的机械性能，包括优异的弹性模量，高拉伸强度和超高断裂能。尤其，即使在水中浸泡24小时后，溶胀的水凝胶仍保持机械强度和韧性。更重要的是，简单地改变交联后的时间可以原位改变壳聚糖网络的紧密度和刚性，从而实现了对混合DN水凝胶结构和力学的灵活而有效的调节。这项研究为DN水凝胶的制备和调节开辟了新领域，有望用于组织支架，致动器和可穿戴设备中。

更新日期：2018-03-25

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