期刊
MACROMOLECULES
卷 53, 期 23, 页码 10323-10329出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.macromol.0c02080
关键词
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资金
- Sasakawa Scientific Research Grant from the Japan Science Society [2018-3035]
- Internal Joint Research Promotion Program, Osaka University
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 X 10(3)). The fracture stress and strain of the network reach ca. 7.2 MPa and 550% strain at 25 degrees 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 degrees C for 24 h.
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