Reversible adhesive based on gallic acid modified acrylate

An inexpensive adhesive bearing polyphenol groups was synthesized in this work. In order to obtain the desired adhesive, gallic acid (3,4,5-trihydroxybenzoic acid) was chosen as the functional compound to modify hydroxyl acrylate copolymer . The rheology and creep properties of the adhesive expressed that its cohesive strength and fatigue resistance were both increased. The resultant adhesive presented a better bonding strength to different substrates, such as steel, polypropylene (PP) and polytetrafluoroethylene (PTFE). In addition, reversible adhesion could be stimulated by modulating the temperature. Shear strength for PP was not less than 0.5 MPa, furthermore that for steel was no less than 4 MPa and the maximum achieved 6 MPa.