Figure 3: Design of HUB-based self-healing materials.
From: Dynamic urea bond for the design of reversible and self-healing polymers
(a) Illustration of the self-healing process of TBEU-based poly(urethane-urea). (b) Chemical structures and ratios of components used for the synthesis of HUB-based cross-linked poly(urethane-urea). (c) Selected snapshots during the course of the self-healing experiment of TBEU-based poly(urethane-urea) 6c. The cut pieces was gently pressed together and left to heal for 12 h at 37 °C. The gel was then stretched. No fracture at the cut region was observed, showing efficient recovery of mechanical properties at the cut interface. The arrow indicates the position being cut.
