《Table 2 Mechanical properties of PEUR-SSx-Ns at original state and after healed:tensile strength (σ

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《基于二硫键的聚氨酯网络:从可调多重形状记忆性能到同步修复（英文）》

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The preparation strategy of PEUR-SSx-Ns is displayed schematically in Scheme 1.In order to fully understand the architecture of the network，the corresponding linear prepolymers PEUR-SSx-Ls before cross-linking were also prepared and characterized by the1H-NMR and GPC（all details are listed in Fig.S1 and Table S1）.Concerning the networks fabrication，we used FT-IR（Fig.1a）to monitor the whole process by observing the strength of–NCO peak to determine the degree of reaction.The-NCO group showed a strong peak at around 2，266 cm-1at the beginning of the reaction.After 12 h chain-extending reaction，the peak intensity decreased but was still visible，which indicated that the linear prepolymer was terminated by–NCO group.When the cross-linker TEA was added，the peak intensity decreased obviously，which meant that the reminding–NCO group was consumed by TEA.At last，the–NCO peak disappeared in the final casting film，indicating the reaction was complete.The swelling test was performed to assess the cross-linking degree，and the results are listed in Table 1.The crosslinking degree was tuned by the amount of TEA.The network N1，N2and N3have different contents of disulfide bonds but similar cross-linking degree with a low gel content ranging from 10%to 15%，since an excessive TEA was added.Keeping the same content of disulfide bonds with N3，network N4and N5were prepared by decreasing the amount of TEA till an equivalent dose.Thus，N5showed a highest cross-linking degree with gel content of 75%.