writer：Xianqiang Yu#, Yu Li#, Jia Yang*, Feng Chen, Ziqing Tang, Lin Zhu, Gang Qin, Yahui Dai, Qiang Chen*
keywords：nanocomposite hydrogels
source：期刊
specific source：Macromolecular Materials and Engineering
Issue time：2018年

Despite recent significant progress in fabricating tough hydrogels, it is still a challenge to realize high strength, large stretchability, high toughness, rapid recoverability and good self-healing simultaneous in a single hydrogel. Herein, Laponite reinforced self-crosslinking poly(N-hydroxyethyl acrylamide) (PHEAA) hydrogels (i.e. PHEAA/Laponite NC gels) with dual physically cross-linked network structures, where PHEAA chains can be self-crosslinked by themselves and also cross-linked by Laponite nanoplatelets, demonstrate integrated high performances. At optimal condition, PHEAA/Laponite NC gels exhibit high tensile strength of 1.31 MPa, ultrahigh tensile strain of 52.23 mm/mm, high toughness of 2238 J/m2, rapid self-recoverability (toughness recovery of 79% and stiffness recovery of 74% at room temperature for 2 min recovery without any external stimuli) and good self-healing property (strain healing efficiency of 42%). The work provides a promising and simple strategy for the fabrication of dual physically cross-linked NC gels with integrated high performances, and helps to expand the fundamentals and applications of NC

gels.