Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 16, Pages 8948-8959Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202100984
Keywords
ionic crystal; MD simulation; phase transition ionogels; reversible adhesive; solid state H-1 NMR
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Funding
- National Natural Science Foundation of China [21835005, U1862109, 21790345]
- Collaborative Innovation Center of Suzhou Nano Science and Technology
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [5832000620]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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The study investigates the synergistic effects between IC, polymer networks, and substrates using solid state H-1 NMR and molecular dynamics simulation. The adhesive layer is reversible and can be detached by heating and re-adhered by cooling.
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 H-1 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.
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