Tianjin University Liu Wenguang's research group AFM: Successfully developed super adhesives, which can be bonded with long-term and high-strength under various harsh environments

In various environments (such as water, sea water, oil, organic solvents, acidic liquids, alkaline liquids and low temperature) to achieve long-term, strong adhesion to the surface of different materials, from industrial manufacturing, construction, transportation, marine engineering to daily life The practical application of it is crucial

In view of the above situation, Liu Wenguang's team from Tianjin University and others reported the construction of a super adhesive based on a new mechanism of zwitterion-initiated polymerization

When 4-AS and 4-AS salts coexist, their spontaneous polymerization can be initiated by zwitterionic mechanism.

Polymerization mechanism

By simply mixing 4-AS and acidic anionic polymer aqueous solution, it is easy to prepare the adhesive

P4-AS-PAA has excellent adhesion to the surface of different substrates such as inorganic ceramics, glass, iron flakes, hydrophobic polymethyl methacrylate (PMMA) and polyethylene (PE)

Material preparation and performance testing

The above results indicate that PAA can accelerate the spontaneous polymerization of 4-AS and contribute to firm adhesion

Other acidic anionic polymer-based adhesives

In order to examine the bonding ability of the adhesive under different conditions, the viscous precursor fluid before curing was pushed out of the syringe and placed at the bottom of a glass beaker filled with oil

Container leakage is very common in industrial manufacturing, marine engineering and daily life

In further experiments, P4-ASPAA can also maintain good adhesion properties in a wide pH range and artificial seawater

Adhesion performance in various harsh environments

Next, molecular dynamics (MD) simulations were performed to analyze the spatiotemporal dynamics of the interface adhesion of P4-AS-PAA on different substrate materials in different liquid environments

Molecular dynamics simulation

Due to its stable polymer network structure, durability and high adhesion

Adhesive's long-term adhesion ability under various conditions

In general, the research developed a series of high-strength fast-curing adhesives by simply mixing 4-AS with other acidic anionic polymers (such as PIA, PSS, and PPA) to create an ecologically benign, capable Tough adhesives that bond various materials and have long-term stability in various harsh environments provide a new strategy