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(a) Stress–strain curves of PVA hydrogel and BPVA-Pluronic hydrogels prepared from varied PVA/Pluronic ratio. (b) Stress–strain curves of the original BPVA-Pluronic-5 hydrogel and cut-healed BPVA-Pluronic-5 hydrogel for healing times of 15 min, 30 min and 60 min. (c) Digital photographs demonstrating the self-healing process of BPVA-Pluronic-5 hydrogel. I original state; II cut into two pieces; III self-healing in 2 min. IV self-healing in 1 h. V stretching after healing.
