The copolymer cylinder (height, 15 mm; diameter, 4.5 mm) was cut into two identical pieces by a knife, and the interfaces were contacted immediately followed by slight extrusion for healing. The stress-strain curves of the healed samples were obtained from the aforesaid mechanical test. The self-healing efficiency was calculated by the ratio of breaking elongation of the healed samples to that of original samples. For the aged samples, the cut interfaces were exposed to air at room temperature for 24 hours and then contacted together for healing.

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