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Towards mechanical robust yet self-healing polyurethane elastomers via combination of dynamic main chain and dangling quadruple hydrogen bonds

Hu, Jin; Mo, Ruibin; Jiang, Xiang; Sheng, Xinxin; Zhang, Xinya

By 27 January 2020No Comments

Polymer, 2019, vol 183pp. 121912



One of the greatest challenges of robust self-healing materials is the confliction between high chain mobility for self-healing and a stable structure for mechanical strength. Herein, dangling 2-ureido-4[1H]-pyrimidione (UPy)-functionalized side groups were introduced into the hard segments of thermoplastic polyurethane (TPU) elastomers, where embedded the dynamic disulfide bonds in the main chain. The strong quadruple H-bonding interaction between UPy side groups acts as supramolecular crosslinkers enabling the TPU elastomer to have improved mechanical properties (tensile strength up to 25?MPa and toughness ~100?MJ?m?3), and simultaneously the plasticizer effect of dangling side chain endows it with efficient healing ability at elevated temperatures (80–100?°C) comparable to its linear analogues. This strategy shows great potential in designing robust self-healing TPU elastomer employing weak dynamic covalent bonds, with wide promising applications as wearable electronics, coatings and adhesives.

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