通过氢键协同作用具有阻燃性和高机械强度的可降解水性聚氨酯,ACS Applied Polymer Materials

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通过氢键协同作用具有阻燃性和高机械强度的可降解水性聚氨酯
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2023-06-21 , DOI: 10.1021/acsapm.3c00749
Chaofan Sun ₁ , Xinyu Bu ₁ , Tingting Yang ₁ , Congde Qiao ₁ , Xingxiang Ji ₁ , Furong Tao ₁ , Ligang Gai ₁ , Libin Liu ₁

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具有可降解性的水性聚氨酯（WPU）对环境至关重要。特别是，具有高机械强度和阻燃性的可降解WPU具有各种重要的工业应用，但阻燃性的增加往往会导致机械强度的降低。在此，我们报告了在一种设计中同时实现了可降解性、阻燃性和高机械强度。可降解WPU的拉伸强度高达39 MPa，并且可以通过软链段的比例进行调节。FTIR、XPS 以及分子动力学模拟证实了不同组分之间强协同氢键相互作用，这使得其具有优异的机械强度。此外，WPU还达到了最高的“V0”级阻燃性。通过改变阻燃剂含量，同时实现了35 MPa的应力和27.55%的极限氧指数。重要的是，WPU具有可降解性，在土壤中自然埋藏3个月后，质量损失率为37%。致密的WPU涂层可以粘附在不同的基材上，并且还具有良好的防腐能力。这项工作为高性能生物降解材料提供了一种有前途的策略，并扩大了聚氨酯的工业应用。

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Degradable Waterborne Polyurethane with Flame Retardancy and High Mechanical Strength via Synergy of Hydrogen Bonds

Waterborne polyurethane (WPU) with degradability is critical to the environment. Especially, degradable WPU with high mechanical strength and flame retardancy features various important industrial applications, while the increased flame retardancy often leads to reduced mechanical strength. Herein, we report the simultaneous realization of degradability, flame retardancy, and high mechanical strength into one design. The tensile strength of degradable WPU is up to 39 MPa and can be tuned by the ratio of soft segments. The strong synergistic hydrogen bond interactions of different components confirmed by FTIR and XPS as well as molecular dynamics simulation are responsible for the excellent mechanical strength. Moreover, WPU achieves the highest “V0” level of flame retardancy. The simultaneous realization of the stress of 35 MPa and a limiting oxygen index of 27.55% is obtained by changing the flame retardant contents. Importantly, WPU possesses degradability with a mass loss rate of 37% after natural burial in soil for 3 months. The dense WPU coatings can be adhered to different substrates and also have good anticorrosion ability. This work provides a promising strategy for high-performance biodegradable materials and expands the industrial application of polyurethane.

更新日期：2023-06-21

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