Weak Hydrogen Bonding Enables Hard, Strong, Tough, and Elastic Hydrogels. 2015

Xiaobo Hu, and Mohammad Vatankhah-Varnoosfaderani, and Jing Zhou, and Qiaoxi Li, and Sergei S Sheiko
Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599-3290, USA.

A new type of "rigid and tough" hydrogel with excellent elasticity is designed by dense clustering of hydrogen bonds within a loose chemical network. The resultant hydrogel exhibits a good combination of high modulus (28 MPa), toughness (9300 J m(-3) ), extensibility (800%), and tensile stress (2 MPa). Furthermore, the gel displays good fatigue-resistance and complete and extremely fast recovery of shape and mechanical properties (3 min at 37°C).

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