Adaptable Strategy to Fabricate Self-Healable and Reprocessable Poly(thiourethane-urethane) Elastomers via Reversible Thiol–Isocyanate Click Chemistry,Macromolecules

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Adaptable Strategy to Fabricate Self-Healable and Reprocessable Poly(thiourethane-urethane) Elastomers via Reversible Thiol–Isocyanate Click Chemistry
Macromolecules ( IF 5.1 ) Pub Date : 2020-05-28 , DOI: 10.1021/acs.macromol.0c00239
Cheng-Jie Fan ₁ , Zhi-Bin Wen ₂ , Zhi-Yuan Xu ₁ , Yi Xiao ₁ , Di Wu ₁ , Ke-Ke Yang ₁ , Yu-Zhong Wang ₁

Affiliation

Currently, a variety of elastomers with a self-healing capacity and reprocessability have been developed by dynamic chemistry to extend the service life, increase the reliability of polymeric materials, and reduce the waste. However, it is still a large challenge to seek an appropriate dynamic interaction that may perfectly match the general performance of the target polymeric materials such as polyurethane. Herein, we report a poly(thiourethane-urethane) (PTUU–N_x) elastomer containing dynamic thiourethane bonds prepared via a thiol–isocyanate click reaction, which is stable at room temperature, healable at moderate temperature, and reprocessable at high temperature. Importantly, it exhibits a mechanical strength similar to the polyurethane because of a very similar structure. The dynamic feature of PTUU–N_x is demonstrated theoretically and experimentally to originate from the exchange of thiourethane bonds via the reversible generation of isocyanates and thiols. Most importantly, the thiourethane bond possesses a much lower bond dissociation energy than the urethane bond, which not only makes PTUU–N_x elastomers easier to be reprocessed but also endows them with a desirable self-healing ability under moderate conditions. In addition, the optimized sample PTUU–N₂ is utilized to fabricate a conductive device by coating Ag glue on the elastomer surface and inserting the coated elastomer into a circuit, which displays a high self-healing efficiency, as the material recovers to its original mechanical property and conductivity. Therefore, these results not only indicate that the PTUU–N_x elastomers have considerable potential for applications in intelligent electronic devices but also provide new ideas for developing new self-healing materials by applying the adaptable dynamic bond to the target polymers.

中文翻译：

通过可逆的硫醇-异氰酸酯点击化学制备自愈和可再加工的聚（硫代氨基甲酸酯-氨基甲酸酯）弹性体的适应策略

当前，已经通过动态化学开发了具有自愈能力和可再加工性的多种弹性体，以延长使用寿命，增加聚合物材料的可靠性并减少浪费。然而，寻找合适的动态相互作用仍然是一个巨大的挑战，该相互作用可以完全匹配目标聚合材料如聚氨酯的一般性能。本文中，我们报告了一种通过硫醇-异氰酸酯点击反应制备的，含有动态硫代氨基甲酸酯键的聚（硫代氨基甲酸酯-氨基甲酸酯）（PTUU–N _x）弹性体，该弹性体在室温下稳定，在中等温度下可修复，在高温下可再加工。重要的是，由于非常相似的结构，它表现出与聚氨酯相似的机械强度。PTUU–N的动态功能在理论上和实验上证明_x源自可逆生成异氰酸酯和硫醇的硫代氨基甲酸酯键交换。最重要的是，硫代氨基甲酸酯键具有比氨基甲酸酯键低得多的键解离能，这不仅使PTUU-N_x弹性体易于再加工，而且使它们在中等条件下具有理想的自修复能力。此外，优化的样本PTUU–N₂通过在弹性体表面上涂覆Ag胶并将涂覆的弹性体插入电路中，该材料可用于制造导电设备，随着材料恢复其原始机械性能和导电性，该电路显示出高的自修复效率。因此，这些结果不仅表明PTUU–N _x弹性体在智能电子设备中具有巨大的应用潜力，而且为通过将可适应的动态键合到目标聚合物上提供了开发新型自修复材料的新思路。

更新日期：2020-05-28

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