Study on Design and Preparation of the Electric-field Responsive High-strength Pressure Sensitive Adhesive

Interfacial bonding and cohesive strength are the two main factors affecting the bonding strength of pressure-sensitive adhesives (PSA), so that meet both low moduli to promote surface wetting and high cohesive strength to impede crack growth is necessary. However, a positive correlation between the moduli and cohesion strength often poses a challenge in designing high-performance PSA. In this study, introducing solid-phase ionic salt (LiTFSI) into the polyelectrolyte not only effectively reduces the modulus of the PSA (7.56 MPa) and enhances the interfacial bonding, but also maintains a high strength (884 kPa), which endows a remarkable lap-shear strength of 1.09 and 1.17 MPa when bonded to metallic aluminum and polyethylene terephthalate (PET), respectively. Furthermore, the migration and/or orientation of ionic groups and free ions enhance the lap-shear strength with an efficiency of 89%. Moreover, a reversed voltage will promote ionic groups and free ions disorient and migrate in a reversed direction, resulting in lower lap-shear strength. Finally, the effect of facilitating charge collection of such PSA in triboelectric nanogenerators was demonstrated. [GRAPHICS] .