As shown in Figure 7 a–d, the self-healing efficiency of P4 and P2 showed an increasing trend, while P1 and P3 were not significantly healed for 20 h.
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Crosslinking density showed a trend of P3 > P4 > P1 > P2, and the Young’s Modulus from 6.0 MPa (P2) to 31.3 MPa (P3).