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Self-Healing Thermoplastic Elastomers Formed from Triblock Copolymers with Dense 1,2,3-Triazole Blocks
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DOI：10.1021/acs.macromol.0c02080.png)
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Abstract
En 中文
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.
Keywords:
CUAAC CLICK-CHEMISTRY
POLYMER
RHEOLOGY
COMPLEXES
MOLECULES
HYDROGELS
MICELLES
TARGETS
BINDING
SHEAR
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