Vitrimer is a new reprocessable thermosetting polymer based on the exchange of dynamic covalent bonds. However, the vitrimer reported in the literatures can usually be reprocessed at very high temperature, while the vitrimer reprocessed at a relatively low temperature exhibits poor mechanical properties. It is still a great challenge to design mechanically robust vitrimer with a moderate reprocessing temperature. Herein, a polyurethane‐urea vitrimer elastomer including N,N′‐diaryl urea with electron donating effect is first reported, and it possesses a moderately remoldable temperature (100 °C, 23% of soft segments content) and robust mechanic al performance. The associative exchange mechanism of N,N′‐diaryl urea with electron donating effect is investigated by the stress relaxation, variable temperature Fourier transform infrared spectra of elastomer, as well as nuclear magnetic resonance spectra, and Fourier transform infrared spectra based on model compounds. Besides, for the preparation of polyurethane‐urea vitrimer elastomers, all monomers are directly from commercial raw materials, thereby providing a possibility of large‐scale production for the polyurethane‐urea vitrimers.

中文翻译：

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通过N，N'-二芳基尿素交联来刺激，温和，坚固，可商品化的聚氨酯-尿素弹性体弹性体

Vitrimer是一种基于动态共价键交换的新型可再加工热固性聚合物。然而，文献中报道的三聚体通常可以在非常高的温度下进行再加工，而在相对较低的温度下进行复相的三聚体表现出较差的机械性能。设计具有适度的后处理温度的机械坚固的微粉磨仍然是一个巨大的挑战。本文首次报道了具有N，N'-二芳基尿素的聚氨酯-脲微晶弹性体，具有供电子作用，并且具有适中的可重塑温度（100°C，软链段含量的23％）和稳定的机械性能。N，N的缔合交换机制通过应力松弛，弹性体的变温傅立叶变换红外光谱，核磁共振谱和基于模型化合物的傅立叶变换红外光谱，研究了具有电子给体作用的'-二芳基尿素。此外，为了制备聚氨酯-脲纤体弹性体，所有单体均直接来自商业原料，从而为聚氨酯-脲纤体的大规模生产提供了可能性。