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The widespread application of polyurea (PUA) in protective coatings typically requires excellent flame retardancy due to real-world usage scenarios. However, the addition of flame retardant additives often compromises the material’s mechanical properties. In this study, a multifunctional reactive additive, MX-SP-NH2, was creatively prepared by covalently grafting spirocyclic pentaerythritol bisphosphorate disphosphoryl chloride (SPDPC) onto MXene (Ti₃C₂T_x) surfaces, followed by the introduction of 1,3-propanediamine (PDA) by the reaction with SPDPC. MX-SP-NH₂ was then incorporated into PUA, participating in its crosslinking process and significantly enhancing both its mechanical strength and flame retardancy. Compared to the control PUA sample, the micro-crosslinked PUA sample with just 1.0 wt% MX-SP-NH₂ demonstrated a 184.3% increase in tensile strength, a 126.1% increase in elongation at break, and a 436.3% increase in toughness. The flammability characterization revealed that the peak heat release rate, peak smoke production rate, and peak CO production rate were reduced by 31.7%, 28.9%, and 61.5%, respectively, indicating a substantial improvement in fire safety. Additionally, the flame retardant PUA-based flexible strain sensors demonstrated stable electrical signal responsiveness. This work has opened up new potential applications of PUA in flexible electronics.

由于實際使用場景，聚脲（PUA）在保護涂料中的廣泛應用通常需要優異的阻燃性。然而，添加阻燃添加劑往往會損害材料的機械性能。在這項研究中，通過將螺環季戊四醇雙磷酸酯二磷酰氯（SPDPC）共價接枝到MXene（Ti₃C₂T_x）表面，然后通過與SPDPC的反應引入1,3-丙二胺（PDA），創造性地制備了一種多功能反應性添加劑MX-SP-NH₂。然后將MX-SP-NH₂摻入PUA中，參與其交聯過程，顯著提高其機械強度和阻燃性。與對照PUA樣品相比，僅含1.0 wt%MX-SP-NH₂的微交聯PUA樣品的拉伸強度提高了184.3%，斷裂伸長率提高了126.1%，韌性提高了436.3%。可燃性表征表明，峰值熱釋放率、峰值煙霧產生率和峰值CO產生率分別降低了31.7%、28.9%和61.5%，表明消防安全得到了實質性改善。此外，基于阻燃PUA的柔性應變傳感器表現出穩定的電信號響應性。這項工作開辟了PUA在柔性電子領域的新的潛在應用。