Expanding the range of strong and self-healable polymer networks is of fundamental interest and practical importance. In this work, we report a network of poly(3-azido-1-propyne)-block-poly(ethylene glycol)-block-poly(3-azido-1-propyne) (APn-b-EGm-b-APn, where m and n denote the degrees of polymerization) triblock copolymer prepared by the modular copper(I)-catalyzed azide–alkyne cycloaddition (CuAAC) polymerization of AP in the presence of alkyne-functionalized EGm. The presence of dense 1,2,3-triazole-containing blocks promotes a microphase-separated structure that provides the network structure elasticity even though the number-average molecular weight is rather low (ca. 4.6 × 10³). The fracture stress and strain of the network reach ca. 7.2 MPa and 550% strain at 25 °C. On the other hand, the dense 1,2,3-triazole moieties in the APn block provide efficient supramolecular interactions that enable self-healing after fracture. The full-cut fractured networks reached ca. 80% recovery of strain and recovered tensile strength to 2.4 MPa after healing at 55 °C for 24 h.

中文翻译：

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由具有稠密的1,2,3-三唑嵌段的三嵌段共聚物形成的自修复热塑性弹性体

扩大牢固和可自我修复的聚合物网络的范围具有根本的兴趣和实际重要性。在这项工作中，我们报告的聚网络（3-叠氮基-1-丙炔） -嵌段-聚（乙二醇） -嵌段-聚（3-叠氮基-1-丙炔）（AP ñ - b -EG米- b -AP n，其中m和n表示聚合度）三嵌段共聚物，是在炔烃官能化的EG m存在下，由AP的模块铜（I）催化的叠氮化物-炔烃环加成（CuAAC）聚合制备的。即使数均分子量相当低（约4.6×10 ³），存在致密的含1,2,3-三唑的嵌段也会促进微相分离的结构，从而提供网络结构弹性。网络的断裂应力和应变达到约。在25°C下为7.2 MPa和550％应变。另一方面，AP n嵌段中的致密1,2,3-三唑部分可提供有效的超分子相互作用，从而实现骨折后的自愈。完整的断裂网络达到约。在55°C愈合24小时后，应变恢复80％，拉伸强度恢复至2.4 MPa。