Polyurethanes are known for their satisfactory mechanical strength, which is highly desired for various applications. Poly (ethyl formal disulfide)-based materials have excellent self-healing ability because of containing abundant exchangeable disulfide bonds, while their strength is relatively low (<0.8 MPa). Combining the advantages of the two materials, in this article, we synthesized self-healable polysulfide-based polyurethanes with a tensile strength of 2.62–5.80 MPa. After healing at 75 °C for 24 h or 100 °C for 4 h, the tensile strength of a fully cut optimized sample (PSPU-15) recovered to 90.8 and 93.1% of the original value 2.62 MPa, respectively, with the damaged incision disappearing and the sealing integrity fully recovered. Furthermore, the sample PSPU-15 possessed good reprocessing ability, retaining the tensile strength of 2.66–2.40 MPa after repeated processing. These outcomes indicated that polysulfide-based polyurethane is an attractive paradigm towards sustainable industrial applications.

聚氨酯以其令人满意的机械强度而著称，这是各种应用所迫切需要的。聚（乙基甲醛缩二硫醚）基材料由于包含丰富的可交换二硫键而具有出色的自修复能力，而其强度却相对较低（<0.8 MPa）。结合这两种材料的优点，在本文中，我们合成了具有2.62–5.80 MPa拉伸强度的可自修复的多硫化物基聚氨酯。在75°C下恢复24 h或在100°C下恢复4 h后，完全切割的优化样品（PSPU-15）的抗张强度分别恢复到原始值2.62 MPa的90.8和93.1％，且切口已损坏消失，密封完整性完全恢复。此外，样品PSPU-15具有良好的后处理能力，保持了2的拉伸强度。重复处理后为66–2.40 MPa。这些结果表明，基于多硫化物的聚氨酯是可持续工业应用的有吸引力的范例。