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. Author manuscript; available in PMC: 2015 May 20.
Published in final edited form as: Nat Commun. 2014;5:3218. doi: 10.1038/ncomms4218

Figure 3. Design of HUB-based self-healing materials.

Figure 3

(a) Illustration of the self-healing process of TBEU(N-tertbutyl-N-ethylurea)-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.