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Xu H, Tu J, Li P, Liang L, Ji J, Xiang G, Li H, Zhang Y, Guo X. Main-Side Chain Hydrogen Bonding-Based Self-Healable Polyurethane with Highly Stretchable, Excellent Mechanical Properties for Self-Healing Acid-Base Resistant Coating. Macromol Rapid Commun 2021; 42:e2100364. [PMID: 34418202 DOI: 10.1002/marc.202100364] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2021] [Revised: 07/24/2021] [Indexed: 12/15/2022]
Abstract
Developing an autonomous self-healing polyurethane (PU) elastomer with excellent mechanical properties and high ductility has attracted increasing attention. Nowadays, the synthesis of elastomers with excellent mechanical properties and rapid self-healing at room temperature faces a huge challenge. Herein, This work reports a new supramolecular PU with excellent mechanical properties and rapid self-healing at room temperature through the introduction of T-type chain extender into the supramolecular polymer chain. The introduction of T-chain extender can be used to enhance the mechanical strength of PU, and the multiple hydrogen bonds on the side-chain provide theoretical support for the rapid self-healing ability of PU. Maximum stress of the synthesized PU can reach 3.4 ± 0.15 Mpa, and maximum elongation at break can reach 3200% ± 160%. Due to flexibility and re-constructability of side-chain hydrogen bonds, PU stress repair efficiency can reach 96.7%, and can be self-healing scratches rapidly and effectively at room temperature. The mechanical properties and self-healing properties of PU can be adjusted by the content of T-type chain extender. The PU is applied to the metal surface coating, which has excellent acid-base resistance, bond strength up to 2.9 ± 0.1 Mpa, and the ability to eliminate local damage on the coating surface quickly at room temperature.
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Affiliation(s)
- Heng Xu
- National Special Superfine Powder Engineering Research Center of China, Nanjing University of Science and Technology, Nanjing, Jiangsu, 210094, P. R. China
| | - Jing Tu
- National Special Superfine Powder Engineering Research Center of China, Nanjing University of Science and Technology, Nanjing, Jiangsu, 210094, P. R. China
| | - Pingyun Li
- National Special Superfine Powder Engineering Research Center of China, Nanjing University of Science and Technology, Nanjing, Jiangsu, 210094, P. R. China
| | - Li Liang
- National Special Superfine Powder Engineering Research Center of China, Nanjing University of Science and Technology, Nanjing, Jiangsu, 210094, P. R. China
| | - Jie Ji
- National Special Superfine Powder Engineering Research Center of China, Nanjing University of Science and Technology, Nanjing, Jiangsu, 210094, P. R. China
| | - Guifeng Xiang
- National Special Superfine Powder Engineering Research Center of China, Nanjing University of Science and Technology, Nanjing, Jiangsu, 210094, P. R. China
| | - Haozhe Li
- National Special Superfine Powder Engineering Research Center of China, Nanjing University of Science and Technology, Nanjing, Jiangsu, 210094, P. R. China
| | - Yang Zhang
- National Special Superfine Powder Engineering Research Center of China, Nanjing University of Science and Technology, Nanjing, Jiangsu, 210094, P. R. China
| | - Xiaode Guo
- National Special Superfine Powder Engineering Research Center of China, Nanjing University of Science and Technology, Nanjing, Jiangsu, 210094, P. R. China
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