Fig. 1. The formation mechanism and microstructures of PU-PAAm hydrogel. (A) Schematic illustration of the formation of PU-PAAm self-adhesive hydrogel and its potential application as sprayable wound dressing; (B) SEM image of PU-PAAm hydrogel; (C) TEM images of PU-PAAm hydrogel under different magnifications, arrows denote the PU globules.
