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A Superstrong and Reversible Ionic Crystal‐Based Adhesive Inspired by Ice Adhesion
Author(s) -
Liu Lili,
Liu Ziyang,
Ren Yongyuan,
Zou Xiuyang,
Peng Wansu,
Li Weizheng,
Wu Yiqing,
Zheng Sijie,
Wang Xiaoliang,
Yan Feng
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202100984
Subject(s) - adhesive , materials science , adhesion , polymer , wetting , ionic bonding , chemical engineering , layer (electronics) , composite material , ionic strength , crystal (programming language) , chemistry , ion , organic chemistry , aqueous solution , computer science , programming language , engineering
In this study, we developed a superstrong and reversible adhesive, which can possess a high bonding strength in the “adhesive” state and detach with the application of heating. An ionic crystal (IC) gel, in which an IC was immobilized within a soft‐polymer matrix, were synthesized via in situ photo‐crosslinking of a precursor solution composed of N, N‐dimethyl acrylamide (DMAA) and a melted IC. The obtained IC gel is homogenous and transparent at melt point. When cooled to the phase transition temperature of the IC, the gel turns into the adhesive with the adhesion strength of 5.82 MPa (on glasses), due to the excellent wetting of melted gel and a thin layer of crystalline IC with high cohesive strength formed on the substrates. The synergistic effects between IC, polymer networks and substrates were investigated by solid state 1 H NMR and molecular dynamics simulation. Such an adhesive layer is reversable and can be detached by heating and subsequent re‐adhesion via cooling. This study proposed the new design of removable adhesives, which can be used in dynamic and complex environments.