Figure 4: Mechanical characterization of HUB-based cross-linked poly(urethane-urea).
From: Dynamic urea bond for the design of reversible and self-healing polymers
(a) Stress–strain curves of 6a, 6c and 6e. (b) Creep recovery of 6a, 6c and 6e with initial strain of 50%. (c) Inefficient recovery of the breaking strain of 6e after long period of healing. (d) Recovery of breaking strain of sample 6c under various healing conditions. The breaking strain of the cut and healed 6c was efficiently and largely restored after 12 h of self-healing (87%) at 37 °C. The healing at room temperature (RT) is less efficient (dotted line).
