Mechanically robust and tough waterborne polyurethane films based on diselenide bonds and dual H-bonding interactions with fast visible-light-triggered room-temperature self-healability,Polymer Chemistry

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Mechanically robust and tough waterborne polyurethane films based on diselenide bonds and dual H-bonding interactions with fast visible-light-triggered room-temperature self-healability
Polymer Chemistry ( IF 4.1 ) Pub Date : 2020-07-21 , DOI: 10.1039/d0py00897d
Wuhou Fan _{1,

2,

3,

4,

5} , Yong Jin _{1,

2,

3,

4,

5} , Liangjie Shi _{1,

2,

3,

4,

5}

Affiliation

Achieving the room-temperature self-healing of polymer materials with mechanically robust and tough features is a challenging project due to their conflicting attributes. Herein, a novel design concept of dynamic but mechanically robust and tough polymer networks was proposed derived from dynamic diselenide bonds and dual H-bonds, in which flexible fluorinated siloxane units and H-bonded urethane and urea groups are embedded simultaneously. Through adjustment of the mass fraction of fluorinated siloxane units incorporated, waterborne polyurethanes with good mechanical performances (tensile strength: 16.31 MPa; toughness: 69.8 MJ m⁻³) could be constructed. Meanwhile, this optimized sample could also be healed at room-temperature within 2 h under visible light. Therefore, the fast room-temperature self-healing of our elaborated polymers with mechanically robust and tough features is achieved, which has never been achieved for the contemporary polymer materials. The reconstruction of dual H-bonding interactions of urethane and urea moieties is responsible for the prophase healing after reconnecting the fracture surfaces, and macromolecular chains containing fluorinated siloxane units with excellent flexibility could promote the visible-light-triggered diselenide metathesis in a highly efficient manner subsequently. Moreover, much improved water resistance properties could also be achieved. The elaborated strategy will provide inspiration for developing mechanically robust and tough water-dispersed polymer materials with fast room-temperature self-repairing performance and desirable water resistance properties, which are of vital importance to the next generation of smart materials.

中文翻译：

基于二硒键和双重氢键相互作用的机械坚固且坚韧的水性聚氨酯薄膜，具有可见光触发的快速室温自修复性

由于其相互冲突的属性，要实现具有机械强度和韧性特征的聚合物材料在室温下的自我修复是一项具有挑战性的项目。本文中，从动态二硒键和双氢键衍生出了动态但机械上坚固且坚韧的聚合物网络的新颖设计概念，其中柔性氟硅氧烷单元与氢键氨基甲酸酯和脲基团同时嵌入。通过调节所掺入的氟化硅氧烷单元的质量分数，可以得到具有良好机械性能（拉伸强度：16.31 MPa；韧性：69.8 MJ m ^-3）的水性聚氨酯）可以构建。同时，该优化的样品也可以在可见光下于2小时内在室温下修复。因此，我们的精细聚合物具有机械坚固和坚韧的特性，可实现快速的室温自修复，这是当代聚合物材料从未实现的。重新连接断裂面后，氨基甲酸乙酯和尿素部分的双氢键相互作用的重建是前期修复的原因，含有具有优异柔韧性的氟化硅氧烷单元的大分子链可以高效地促进可见光触发的二硒化物复分解后来。此外，还可以实现大大改善的耐水性。

更新日期：2020-09-01

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