Strong and tough fully physically crosslinked double network hydrogels with tunable mechanics and high self-healing performance

By Xiao-hui Wang, Fei Song, Danlin Qian, Yao-dong He, Wu-Cheng Nie, Xiu-Li Wang, Yu-Zhong Wang. Chemical Engineering Journal, 2018

206 citations recorded by the source corpus.

Abstract Suffering weak mechanical properties, hydrogels are generally limited for high load-bearing applications. Herein, chitosan and poly(acrylic acid) (PAA) are employed as double networks (DN), and metal-coordination and chain entanglement are exploited as dual crosslinks to develop fully physically crosslinked DN hydrogels. In spite of the non-covalent crosslinking, the hydrogel exhibits impressive tensile properties (3.7 ± 0.12 MPa) and toughness (1200 ± 50% of elongation at break and 2.8 × 103 J m−2 of fracture energy). In addition, good fatigue resistance and self-recovery performance are achieved for the hydrogel because of their supramolecular nature. Notably, the DN hydrogel display good self-healing property with recovered fracture stress and strain of 1.4 MPa and ∼700%, respectively. The results indicate that the supramolecular design proposed in this work can bring more benefits for wide applications of hydrogel.

Subfields: Biomedical Engineering, Mechanical Engineering, Molecular Medicine

View Paper: https://www.semanticscholar.org/paper/2616d313aee5e1cb57ca4a1709e0087aafd80d14