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    Home > Dong Shengyi and Zhao Wanxiang of Hunan University have made important progress in the research of supramolecular adhesion materials based on hydrogen bonding

    Dong Shengyi and Zhao Wanxiang of Hunan University have made important progress in the research of supramolecular adhesion materials based on hydrogen bonding

    • Last Update: 2019-06-01
    • Source: Internet
    • Author: User
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    Hydrogen bond driven self-assembly is a widely used method to synthesize supramolecular polymer materials Many supramolecular polymers prepared by hydrogen bonding have excellent kinetic properties and functions In the supramolecular polymer, water molecule is an indispensable comonomer in the polymer On the one hand, it can realize solvent-free supramolecular polymerization; on the other hand, it fully demonstrates the versatility of water participating in hydrogen bond, and expands the application of water in supramolecular chemistry Because of the complex relationship between water and polymer repeating monomers, it is still difficult for water to participate in the design of supramolecular polymers Recently, the cooperation team of Professor Dong Shengyi and Professor Zhao Wanxiang of the school of chemistry and chemical engineering of Hunan University has made important progress in the research of water participating in the formation of hydrogen bonding supramolecular adhesion materials This achievement was published in J am Chem SOC., DOI: 10.1021/jacs.9b02677, if = 14.357, under the title of "formation of a supramolecular polymer adhesive via water – participant hydrogen bond formation" Zhang Qiao, a master's degree candidate from the school of chemistry and chemical engineering of Hunan University, is the first author of the paper Li Tao, an assistant professor of the school of chemistry and chemical engineering, and Duan abing, an assistant professor of the school of environmental engineering and science are the co first authors Dong Shengyi, Zhao Wanxiang and Peter J stang, a professor of the University of Utah, are the co correspondents Figure 1 Synthesis of I and II (source: J am Chem SOC.) in this study, the research team used non viscous, non polymer monomers to prepare supramolecular polymer adhesive by Pt pyridine coordination water crown ether hydrogen bond (Figure 1) Monomer I has neither water absorption nor adhesion under the conditions of high or low temperature, humidity change and anhydrous or organic solvent (Fig 2a) The coordination product II with Pt is a bright yellow solid in the dry state It has no viscosity at room temperature, but it can quickly absorb the water in the air when placed in the air It uses the hydrogen bond of water and crown ether to form a highly viscous adhesive material (Fig 2b) The long and flexible viscous fibers can be easily extracted from the II water mixture (Fig 2C) Figure 2 Water absorption behavior of (a) I and (b) II, and (c) fibers drawn from II water mixtures For example, coating the glass surface with II water mixture to connect the two glass plates together, even when the hanging weight is up to 12 kg, no separation or dislocation of the glass plates is observed (Fig 3C) The adhesiveness of II water adhesive materials is temperature dependent and weakens with the increase of temperature Once the temperature exceeds 50 ℃, the two glass plates can be separated relatively easily However, the decrease of temperature quickly restored the strong adhesion The cycle test shows that the adhesion of the adhesive is reversible After several cycles, the adhesion strength does not decrease significantly (Fig 3b) Figure 3 Quantitative application experiments involved (a) II water application at different temperatures and (b) cycling tests of II water application (c) macroscopical application tests of II water application on glass and paper The application areas are 7.5 × 7.5 cm 2 and 4.0 × 3.5 cm 2, perspective
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