Main-Side Chain Hydrogen Bonding-Based Self-Healable Polyurethane with Highly Stretchable, Excellent Mechanical Properties for Self-Healing Acid–Base Resistant Coating,Macromolecular Rapid Communications

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Main-Side Chain Hydrogen Bonding-Based Self-Healable Polyurethane with Highly Stretchable, Excellent Mechanical Properties for Self-Healing Acid–Base Resistant Coating
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2021-08-21 , DOI: 10.1002/marc.202100364
Heng Xu ₁ , Jing Tu ₁ , Pingyun Li ₁ , Li Liang ₁ , Jie Ji ₁ , Guifeng Xiang ₁ , Haozhe Li ₁ , Yang Zhang ₁ , Xiaode Guo ₁

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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.

中文翻译：

主侧链氢键基自修复聚氨酯具有高拉伸性，优异的机械性能，用于自修复耐酸碱涂层

开发具有优异机械性能和高延展性的自主自修复聚氨酯 (PU) 弹性体已引起越来越多的关注。如今，合成具有优异机械性能和室温下快速自愈合的弹性体面临着巨大的挑战。在此，这项工作通过将 T 型扩链剂引入超分子聚合物链中，报道了一种具有优异机械性能和室温下快速自修复的新型超分子 PU。T-扩链剂的引入可用于增强PU的机械强度，侧链上的多个氢键为PU的快速自愈能力提供了理论支持。合成PU的最大应力可达3.4±0.15Mpa，最大断裂伸长率可达3200%±160%。由于侧链氢键的柔韧性和可重构性，PU应力修复效率可达96.7%，并可在室温下快速有效地自修复划痕。PU的力学性能和自愈性能可以通过T型扩链剂的含量来调节。PU应用于金属表面涂层，具有优异的耐酸碱性能，结合强度可达2.9±0.1Mpa，并能在室温下快速消除涂层表面的局部损伤。

更新日期：2021-10-22

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