Figure 3. MN adhesive firmly adheres to skin.
a, Normal adhesion strength for PS MN and BCP MN adhesives with 20% and 40% swellable tip height fractions following insertion into skin (2 min and 10 min). Flat PS and PS-b-PAA films were used as controls. b, Effect of swelling time within skin on adhesion for a BCP MN adhesive with a swellable tip height fraction of 40%. c, Representative force-displacement curve during BCP MN insertion into, and removal from pig skin. d, Photograph of flexible BCP MN adhesive (2cm × 2cm) prepared by using a thermoplastic elastomer as the base material (in place of PS). e, Adhesion on a dynamic surface. Flexible BCP MN adhesives applied to shaved skin on top of the pig wrist joint showed firm attachment during ~ 100 cycles of bending motion. All error bars represent standard deviation.