Fig. 5.

Schematic representing shear adhesion experiments. A benzophenone activated sample was covalently bound to methacrylate-functionalized glass by photografting/photopolymerizing the zwitterionic polymer between substrates. The samples were strained until fracture by applying a force to both ends of the substrates. The samples showed either adhesive failure (left image), where the polymer remains adhered to the glass, or cohesive failure (right image), where the film itself fractures yet remains adhered to both substrates.