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Liu, Lili; Liu, Ziyang; Ren, Yongyuan; Zou, Xiuyang; Peng, Wansu; Li, Weizheng; Wu, Yiqing; Zheng, Sijie; Wang, Xiaoliang; Yan, Feng
Angewandte Chemie, April 12, 2021, Letnik: 133, Številka: 16Journal Article
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 1H 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. Inspired by reversible ice adhesion, a reversible ionic crystal (IC) based gel adhesive was prepared, which showed superstrong and reversible adhesion due to the phase transition of ICs. In addition, the reversible adhesion can be adjusted by heating and light, and be effectively monitored by resistance and capacitance.
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