Abstract
In this study, 2,6-diacetylpyridine dioxime was synthesized from 2,6-diacetylpyridine and hydroxylamine hydrochloride as raw materials and bonded into the molecular chain of waterborne polyurethane as an alcohol chain extender, Subsequent addition of Cu2+ interacted with the Schiff base structure in the WPU molecular chain to generate room-temperature self-healing polymeric materials with multiple dynamic bonds based on ligand bonds, oxime carbamates, and hydrogen bonds. Due to the synergistic effect of multiple dynamic bonds, DWPU-Cu0.25 exhibited excellent mechanical properties (tensile strength of 11.9 MPa and elongation at break of 1620%) and excellent room temperature self-healing ability (healing efficiencies of 89.1% and 95.8% for elongation at break and tensile strength, after 72 h of room temperature healing). Additionally, antibacterial experiments showed that DWPU-Cu films can release copper ions and create antibacterial zones around polyurethane films, demonstrating their use in the field of antibacterial coatings. By introducing covalent bonds and non-covalent dynamic bonds into the waterborne polyurethane to improve the healing ability of the material, and this internal self-healing method avoids the disadvantages of the external self-healing method, such as irreversibility, complex operation and poor compatibility. This self-healing mechanism based on the dynamic bond inside the material can not only realize repeated self-healing, but also have excellent basic properties, and can also expand other functions on the basis of self-repair, and realize the application of multifunctional materials.
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The financial support from the Natural Science Foundation of China (NSFC) (No. 21978112) and MOE & SAFEA for the 111 Project (B13025) is gratefully acknowledged.
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Highlights
1. Room temperature self-healing waterborne polyurethane based on coordination bonds, oxime carbamates and hydrogen bonds.
2. Waterborne polyurethane film with antibacterial properties against Escherichia coli and Staphylococcus aureus.
3. A novel oxime chain extender 2,6-diacetylpyridine dioxime prepared by the reaction of 2,6-diacetylpyridine with hydroxylamine hydrochloride.
4. Waterborne polyurethane excellent mechanical properties gived by the synergy of various dynamic bonds.
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Wang, Y., Chen, L., Jiang, P. et al. Mechanically robust room-temperature self-healing waterborne polyurethane with antimicrobial properties constructed through multiple dynamic bonds. J Polym Res 30, 387 (2023). https://doi.org/10.1007/s10965-023-03770-y
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DOI: https://doi.org/10.1007/s10965-023-03770-y