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(A) Stress–strain curves at 80 mm/min and 21 °C of various healing brush polyurethanes. Pristine samples are reported as continuous lines, and healed samples are reported as dashed lines. HDI_C4DA was healed for 100 h at 36 °C. HDI_C8DA and HDI_C7DA were healed for 3 h at 36 °C. The plot shows recovery of Young’s modulus and yield stress. (B) Photo capture of HDI_C4DA after healing for 100 h at 36 °C. The black circle highlights the position of the original fracture plane.
