Developing visible-light-induced dynamic aromatic Schiff base bonds for room-temperature self-healable and reprocessable waterborne polyurethanes with high mechanical properties,Journal of Materials Chemistry A

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Developing visible-light-induced dynamic aromatic Schiff base bonds for room-temperature self-healable and reprocessable waterborne polyurethanes with high mechanical properties
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020/03/18 , DOI: 10.1039/c9ta13928a
Wuhou Fan _{1,

2,

3,

4,

5} , Yong Jin _{1,

2,

3,

4,

5} , Liangjie Shi _{1,

2,

3,

4,

5} , Rong Zhou _{1,

2,

3,

4,

5} , Weining Du _{1,

2,

3,

4,

5}

Affiliation

Herein, a novel type of visible-light-induced dynamic covalent bond was developed based on aromatic Schiff base (ASB) bonds, and the prepared waterborne polyurethanes containing dynamic ASB bonds (ASB-WPU) exhibited a desirable self-healability (healing efficiency of 83.8%) after healing under a commercial LED table lamp for 24 hours (temperature of ∼25 °C). Meanwhile, high mechanical properties (tensile stress of 14.32 MPa and toughness of 64.80 MJ m⁻³) could also be obtained, demonstrating a good balance of room-temperature self-healability and high mechanical properties in our polymers. The imine metathesis of ASB bonds and the H-bonded interactions between urethane groups could afford the ultimate healing result simultaneously, in which the imine metathesis of ASB bonds triggered by visible light is the main factor. Furthermore, these ASB-WPU polymers could also be reprocessed under visible light with well recovered mechanical properties. We envision that this elaborate design philosophy, based on the readily available, clean, safe and easily manipulable visible light, could provide inspiration for preparing room-temperature self-healable and reprocessable polymers with high mechanical properties, which are urgently needed for next-generation smart materials.

中文翻译：

为具有高机械性能的室温自修复和可再加工的水性聚氨酯开发可见光诱导的动态芳族席夫碱键

在此，基于芳香族席夫碱（ASB）键开发了一种新型的可见光诱导的动态共价键，并且所制备的含有动态ASB键的水性聚氨酯（ASB-WPU）表现出理想的自修复性（修复效率为在市售LED台灯下治愈24小时（温度约25°C）后，其恢复率为83.8％。同时，高机械性能（张应力为14.32 MPa，韧性为64.80 MJ m ^-3））也可以得到，这表明我们的聚合物在室温下自我修复性和高机械性能之间达到了良好的平衡。ASB键的亚胺复分解和氨基甲酸酯基团之间的H键相互作用可以同时提供最终的治疗效果，其中可见光触发的ASB键的亚胺复分解是主要因素。此外，这些ASB-WPU聚合物也可以在可见光下进行再加工，并具有良好的机械性能。我们设想，这种基于易于获得，清洁，安全和易于操作的可见光的精心设计的设计思想，可以为制备具有较高机械性能的室温自修复和可再加工的聚合物提供灵感，这是下一代迫切需要的智能材料。

更新日期：2020-04-08

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